p R f l a i c n i S€RL D€SIGN
MECHANICAL ENGINEERING A Series of Textbooks and Reference Books EDITORS L. L. FAULKNER Department o f Mechanical Engineering The Ohio State University Columbus, Ohio S. B. MENKES Department o f Mechanical Engineering The City College o f the City University o f New York New York, New York 1 . 2. 3. 4. 5. 6.. 7. 8. 10. 11. 12. 13. 14. 15. Spring Designer’s Handbook, by Harold Carlson Computer-Aided Graphics and Design, by Daniel L. Ryan Lubrication Fundamentals, by J. George Wills Solar Engineering for Domestic Buildings, by William A. Himmelman Applied Engineering Mechanics: Statics and Dynamics, by G. Boothroyd and C. Poli Centrifugal Pump Clinic, by Igor J. Karassik Computer-Aided Kinetics for Machine Design, by Daniel L. Ryan Plastics Products Design Handbook, Part A: Materials and Components; Part B: Processes and Design for Processes, edited by Edward Miller Turbomachinery: Basic Theory and Applications, by Earl Logan, Jr. Vibrations of Shells and Plates, by Werner Soedel Flat and Corrugated Diaphragm Design Handbook, by Mario Di Giovanni Practical Stress Analysis in Engineering Design, by Alexander Blake An Introduction to the Design and Behavior of Bolted Joints, by John H. Bickford Optimal Engineering Design: Principles and Applications, by James N. Siddall Spring Manufacturing Handbook, by Harold Carlson
16. Industrial Noise Control: Fundamentals and Applications, by Lewis H. Bell 17. Gears and Their Vibration: A Basic Approach to Understanding Gear Noise, by J. Derek Smith 18. Chains for Power Transmission and Material Handling: Design and Applications Handbook, by the American Chain Association 19. Corrosion and Corrosion Protection Handbook, edited by Philip A. Schweitzer 20. Gear Drive Systems: Design and Application, by Peter Lynwander 21. Controlling In-Plant Airborne Contaminants: Systems Design and Calculations, by John D. Constance 22. CAD/CAM Systems Planning and Implementation, by Charles S. Knox 23. Probabilistic Engineering Design: Principles and Applications, by James N. Siddall 24. Traction Drives: Selection and Application, by Frederick W. Heilich III and Eugene E. Shube 25. Finite Element Methods: An Introduction, by Ronald L. Huston and Chris E. Passerello 26. Mechanical Fastening of Plastics: An Engineering Handbook, by Brayton Lincoln, Kenneth J. Gomes, and James F. Braden 27. Lubrication in Practice, Second Edition, edited by W. S. Robertson 28. Principles of Automated Drafting, by Daniel L. Ryan 29. Practical Seal Design, by Leonard J. Martini OTHER VOLUMES IN PREPARATION
p R n a i c n i seni DESIGN LEONARD J. MARTINI Naval Ocean Systems Center San Diego, California Taylor Su Francis Taylor Francis Group Boca Raton London New York Singapore A CRC title, part of the Taylor & Francis imprint, a member of the Taylor & Francis Group, the academic division of T&F Informa pic.
Dedicated to my Dad and Mom L ib rary of Congress Cataloging in Publication Data Martini, Leonard J ., [date ] Practical seal design. (Mechanical engineering ; 29) Includes bibliographical references and index. 1. Sealing (Techno logy ) 2. Elastomers. I. Title. II. Series. TJ246.M37 1984 621.8’85 83-26306 ISBN 0-8247-7166-4 COPYRIGHT © 1984 by MARCEL DEKKER ALL RIGHTS RESERVED Neither this book nor any part may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, microfilming, and recording, or by any information storage and retrieval system, without permission in writing from the publisher. MARCEL DEKKER 270 Madison Avenue, New York, New York 10016 Current printing (last d ig it ): 10 98765432 PRINTED IN THE UNITED STATES OF AMERICA
Preface This book was written to help fill a gap in the mechanical engineering literature on elastomeric seals. Up to this time, designers have had to depend on 0 -r in g seal handbooks and product sale manuals, which at best are subjective and limited in theoretical and practical application. Practical Seal Design provides the designer with a comprehensive discussion of the theory and practical application of elastomeric ring seals. The theory is reduced to practical use and presented in a manner conducive to solving current sealing problems. Part I of the book is devoted to a general discussion of elastomeric ring seals, including specific topics in elastomeric ring seal geometry, material-compound capability, and material perform ance under various environments. Part II is devoted to the detail of specific applications of static, reciprocating, and rotary seal function. Although the book contains various sections of theoretical d iscussion, it has been written with the designer in mind. General and specific design methods are presented together with solved engineering problems that elaborate important design considerations. In this regard , the book is helpful to students who want to understand seal theory and learn to apply it to actual field prob lems. The book centers around the use of elastomeric O -rin gs , but the design methods and practical engineering considerations are applicable to most other types of elastomeric seal configurations . The book is full of aids for the seal designer. 0 -r in g specifications for military and aerospace standards, tube fittings, and electrical connectors are consolidated for easy access. Property comparison tables and temperature capability charts for the currently used elastomeric compounds are presented. To aid the
Preface designer in trade-off studies, a series of material performance charts for selecting the proper elastomeric material based on temperature, environmental, and physical criteria is provided. A list of some 49 elastomeric ring seal manufacturers and distributors are presented arranged by location. Detailed design considerations, such as 0 -r in g stretch, swell, shrinkage, and blowout pre vention, are culminated with a designer's quick reference table for important design criteria factors. Under specific applications of 0 -r in g seals, a chapter is devoted to clearing up the confusion between military and industrial specifications for 0 -r in g gland designs, together with design ex ample problems. Military and industrial bases for tube fittings are discussed in Chapter 4, and equation methods and compression load charts for face-seal glands are also presented. Chapter 5 forwards a theoretical method for determining the effect of side loads on a piston within a cylinder and the restoring force required for concentricity. Nomograms for easily determining O -rin g fr ic tion as a function of pressure and cross-sectional squeeze for cylinder-piston application are presented, together with a discussion on minimizing system hysteresis. Each of these subjects is followed by design examples. Chapter 6 is devoted to rotary seal design for shafts using standard elastomeric O -rin gs . A revo lutionary method of extending the life of O -rings in rotary seal applications is analyzed in detail. The method results in a seal gland design that puts the O -rin g in peripheral compression to counteract frictional effects produced by the shaft running against the O -rin g seal. Slanting the O -rin g glands relative to the axis of the shaft further extends the life of the seal. The chapter concludes with practical design data for manufacturing such rotary seal glands and design tables for the practical designer. Although the design tables cover the entire range of O -rin g sizes, the designer is cautioned because only a few of the sizes have been verified by actual hardware. Those rotary shaft seal designs that have been reduced to practical use have proven successful for many years. The book attempts to cover the practical applications of elastomeric O -rin g seals for the designer who must make responsible engineering decisions. Although most of the theoretical concepts presented in this book are reduced to practical application and elaborated by design example problems, the designer is cautioned to use discretion when applying the detailed concepts to particular design problem. The ancient commendation of wisdom by King Solomon is appropriate: I, wisdom, dwell with prudence And I find knowldege and discretion (Proverbs 8:12)
The experienced designer has learned to use discretion in all judgments, and verifies designs through actual testing whenever possible. This is particularly true in the field of seal design. The author wishes to express his appreciation to those who helped in the preparation of this book: secretaries Joan Goddard, Margret Cole, and Betty Kimberly; engineer in training, Mike Phillips; and the many publishers and corporations for their permission in using the various materials and information incorporated in the writing of this book. I also wish to thank the staff of Marcel Dekker, In c ., for their help and encouragement. This book has grown out of my previously published work Designing for Elastomeric Ring Seals, a chapter in Plastic Products Design Handbook, edited by E. Miller, Marcel Dekker, In c ., 1981. Preface v Leonard J. Martini
Contents Preface Figures, Tables, Charts, and Design Examples 111 ix I ELASTOMERIC RING SEALS Basic Configuration of Elastomeric Ring Seals I. Geometry and Application II. Size III, Compounds and Materials IV. Elastomeric Specifications V . Manufacturers and Distributors 3 3 7 18 26 30 General Design Method I. Design Method II. Specific Design Considerations III. Material Performance of Elastomers 39 39 47 54 II SPECIFIC APPLICATIONS OF RING SEALS Static and Reciprocating Seal Applications: Clearing Up the Confusion Between the Military and Industrial O -R ing Gland Specifications 67 I. General Areas of Confusion Between Military and Industrial Specifications 67 II. Specific Discrepancies 82 Static Seal Applications 91 I. Squeeze 91 II. Stretch 92
VIII Contents III. Backup Rings IV . Surface Finish V . Standard Bosses and Fittings V I. Face-Seal Glands 95 95 95 101 Reciprocating Seals— Pistons and Cylinders I. Design Parameters II. Failure and Causes III. Applied Side Loads and 0 -R in g Restoring Forces IV. Dynamic Friction V . Static Friction V I. System Hysteresis V II. Design for Absolute Minimum Friction Appendix 5A. Total Restoring Forces for Eccentric Pistons 108 108 109 110 116 125 126 127 132 Rotary Seals— Designs for Rotating Shafts I. Theory II. Practical Design Data Appendix 6A. Determination of Relationship Between Percent of Diametral Reduction of 0 -R ing and Percent Increase in Cross-Sectional Width 232 232 257 279 References Index 283 285
Figures, Tables, Charts, and Design Examples Figures Fig. 1 Elastomeric Seal Applications 4 Fig. 2 Temperature Capabilities of Principal Elastomers Employed in Seals 21 Fig. 3 Methods to Avoid Sharp Installation Corners 40 Fig. 4 Chamfer Piston for Pvod Gland 41 Fig. 5 Maximum Gap Allowable without Extrusion Failure 42 Fig. 6 Loss of Compression Diameter Due to Stretch 48 Fig. 7 Blowout Prevention 50 Fig. 8 Compression Load per Linear Inch of Seal 87 Fig. 9 Comparison of Tube Fitting Glands 100 Fig. 10 0 -R ing Compression Loads for 0.070-in. Cross Section 103 Fig. 11 O -Ring Compression Loads for 0.103-in. Cross Section 104 Fig. 12 O -Ring Compression Loads for 0.139-in. Cross Section 105 Fig. 13 O -Ring Compression Loads for 0.210-in. Cross Section 106 Fig. 14 O -R ing Compression Loads for 0.275-in. Cross Section 107 Fig. 15 Side-Loaded Piston 111 Fig. 16 Piston Gland Cross Section 113 Fig. 17 Nomogram 1. O-Ring Friction Due to D ifferential Pressure 117 Fig. 18 Nomogram 2. O -Ring Friction Due to CrossSectional Squeeze 118 IX
Figures and Tables Fig. 19 Fig. 20 Fig. Fig. Fig. Fig. Fig. Fig. Fig. Fig. Fig. F ig. Fig. Fig. Fig. Fig. Fig. Fig. System Hysteresis for Constant 10% 0 -R ing Squeeze S^ 127 System Hysteresis for Constant Differential Pressure AP of 200 psi 128 Rotary Shaft Seal 234 Spindle Design — Rotary 0 -R ing Seals 236 The Theoretical Relationship of f and I 240 24(a) 0 -R ing in Peripheral Compression 241 24(b) Rotary 0 -R ing Seal — Design Stresses 243 25 0 -R ing Insertion Tool 245 Extreme PV Values vs . Safe Running Time 247 Self-Lubricating Gland Seal — Slanted 0 -R ing Groove 249 Torque Reduction/Slanted Groove 250 Self-Lubricating Gland Seal 251 Extreme PV Values vs. Safe Running Time/ Slanted Groove 256 Chrome Shaft with Bronze Seal Housing 257 Chrome Shaft with Slanted Seal Housing 258 Dimensions for Floating Seal 259 Oil Filling of Rotary Seal 261 Rotary 0 -R ing Gland of Peripheral Compression and Oil Annulus 263 21 22 23 26 27 28 29 30 31 32 33 34 35 Tables Table Table Table Table Table Table Table 7 Table 8 Table 9 Table 10 Elastomeric Ring Seals Air Force-Navy Aeronautical Standard, Hydraulic ”0 ” Ring Packings, A N 6227 Military Standard, Preformed Packings, MS28775 0 -R ings for Tube Fittings O -Rings for Electrical Connectors Comparison of Properties of Commonly Used Elastomers Elastomeric Specifications: Military Aerospace Material Specification, National Aerospace Standard Elastomeric Ring Seals: Manufacturers and Distributors Fluid Compatibility Designer’s Quick Reference: Specific Design Considerations 8 9 15 18 19 27 30 43 53
Figures and Tables Table 11 Preferred Material in Descending Order of O verall Performance, Temperature Resistance, Environmental Resistance, and Physical Resistance Table 12 Military Gland Design and 0 -R ing Selection Table 13 Industrial 0 -R ing Static Seal Glands Table 14 Industrial Specification for Reciprocating 0 -R in g Packing Glands Table 15 Boss, Straight-Thread Tube Fitting (Industrial-Adopted Specification MS 16142) Table 16 Boss, Internal Straight Thread (MS 33649) Table 17 Flared Tube Fittings (MS 33656) Table 18 Face-Seal Glands Table 19 Relationships Between Dimensions and Environmental Parameters Table 20 Allowable Shaft Speed, Gland Depth, and Groove Width for 0 -R ing Cross-Sectional Diameter Table 21 Selection of 0 -R ing Cross Section Based on Shaft Speed Table 22 Rotary Shaft Seal Design Table (Floating Housing) Table 23 Rotary Shaft Seal Design Table (O -R ing Squeeze and Peripheral Compression) 63 6 8 73 82 96 97 98 102 235 239 262 264 271 Charts Chart lA Chart Chart Chart IB 1C ID Material Performance of Elastomers: Most Common Material First 55 Elastomers: Best Resistance to Temperature 57 Elastomers: Best Environmental Resistance 59 Elastomers: Best Physical Resistance 61 Design Examples Design Example 1 Comparison: Military vs. Industrial Specifications for O -R ing Size 342 88 Design Example 2 Comparison: Military vs. Industrial Specifications for O -R ing Size 116 89 Design Example 3 Static Elastomeric Seal Application: Male Gland Involving Low Temperature 92 Design Example 4 Maximum Allowable Side Load on Piston 111
XII Figures and Tables Design Design Design Design Design Design Design Design Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 Design Example 13 Piston Eccentricity 112 Friction of the Reciprocating Elastomeric Seal 2-336 0 -R ing 119 Friction of Reciprocating Elastomeric Seal 121 Friction of Reciprocating Elastomeric Seal 124 Minimum Friction for Very Small 0 -R ing 128 Minimum Friction for Very Large ORing 130 Rotary Spindle Design 235 Self-Lubricating Gland Seal — Slanted 0 -R in g Grooves 251 Design of Rotary 0 -R ing Seal Using Design Tables 278
PRACTICAL SEAL DESIGN
I ELASTOM ERIC RING SEALS
Basic Configuration of Elastomeric Ring Seals Elastomeric ring seals are circular rings of various cross-sectional configurations installed in a gland to close off a passageway and prevent escape or loss of a fluid or gas. Designing for elastomeric ring seals depends on three major and interrelated variables the operating conditions or environment the seal will experience, the gland geometry into which the seal will be installed, and the seal material and geometry. The various interrelations of these three variables account for the fact that there are so many d ifferent types of seals and applications. Figure 1 shows a cross-sectional view of an oil pump incorporporating various common applications of static and dynamic elastomeric ring seals. Static seals do not see relative motion between themselves and the parts they seal. In Fig. 1, O -rings are used on the inlet and outlet tube fittings and top and bottom flange plates, these being static seal applications. Other static seal applications include face seals and seals for electrical connectors. Dynamic seals experience relative motion between themselves and the parts they seal, typically used on pistons, rotating shafts and intermittent face seal applications, as in check valves. This chapter presents for easy reference the various kinds of elastomeric seals currently available to the designer: that is, cross-sectional configurations, sizes, and materials. Properties of the commonly used elastomers are discussed and finally summarized . I. GEOMETRY AND APPLICATIO N There are at least 49 American manufacturers of some 20 different types of elastomeric ring seals. (A list of manufacturers and dis-
Chap. 1. Basic Configuration DYNAMIC SEALS Figure 1. Elastomeric seal applications tributors appears in Table 8 .) Table 1 presents 12 basic confiurations and their applications, most other types being derivatives of these. The circular cross-sectioned seal, commonly known as the 0 -r in g , is the most used and the least expensive. It is used in two general design applications: static and dynamic. Static applications may range from vacuum to over 60,000 psi for sealing flanges and O -rin g grooves. One such seal is the Bal-Seal made for static face seals. Design manuals and catalogs are usually available free of charge from all estomeric seal manufacturers. Such information should always be consulted when designing glands for uncommon types of seals and their application. Elastomeric seals with lobed cross sections were designed for both static and dynamic applications. The four- and six-lobed configurations resist spiral failure and also extrusion failure in applications with large clearance between parts. Of the some 20 different types of elastomeric ring seals available, the common O -rin g type is the most versatile. The conventional type of O -rin g may be used in almost any application if the gland to contain the O -rin g is designed correctly and the right size and material is chosen for the O -rin g .
Geometry and Application Table 1. Elastomeric Ring Seals Configuration / cross section Application /usage 0 -rin g Static seal for flanges, face seals, fittings, electrical connectors Dynamic seal for limited speed and pressure of reciprocating and rotary sealing 0 -r in g with straight and contoured backup rings Static seal for very -h igh -pressu re application which may otherwise cause 0 -r in g extrusion (fo r pressure greater than 1000 psi when total diametral clearance is greater than 0.010 in . ) Dynamic seal to prevent spiral failure in reciprocating applications and extrusion in h igh -pressure reciprocating and rotary applications Parker Polypak Static, reciprocating, and rotary applications where pressures range from 800 to 60,000 psi; e ffective in out-of-round or tapered cylinder bores SCL seal Reciprocating rod-cylinder application to prevent the usual slight weepage seen in 0 -r in g -typ e rodcylinder applications; normal high pressure limit of 10,000 psi when used with backup rings. U- or V-seals Reciprocating rod and piston-cylinder applications; normal highpressure limit of 3000 psi with backup rings.
Table 1. (continued) Chap. 1. Basic Configuration Configuration/ cross section Application /usage Piston T-seals Rod Spring-loaded BAL-seal Spring-loaded static face sea l-B AL seal Piston cups Quad-X ring Reciprocating: piston-cylinder and rod-cylinder seals to a limiting pressure of 10,000 psi without rolling or spiral failure; recommended for h igh -pressure longstroke cylinder applications; clearance between piston or rod and cylinder wall may be increased beyond that recommended for conventional 0 -r in g seals. Reciprocating rod and piston-cylinder applications, 0 to above 10,000 psi with less friction than conventional type 0 -r in g s (0.02 coefficient of friction) Rotary applications for reduced friction; limited to maximum PV = 75,000 psi-fpm^ Static applications, 0 to 10,000 psi Static face seal, vacuum to 3000 psi, -7 0 to 550^F; may be used in standard 0 -r in g grooves Piston seals for pressures to 10,000 psi, and rough cylinder bore finishes up to 250 rms, or where clearance between the piston and bore is wider than recommended for standard O -rin gs . Static seal for reliable performance at pressures beyond 2000 psi Reciprocating applications to resist and eliminate spiral failure Rotary applications for higher speeds than conventional 0 -r in g s
Size Table 1. (continued) Configuration/ cross section Application/usage Quad elongated four-lobed seal Piston Kapseal Rod Static and dynamic applications where large diametral clearances may otherwise result in extrusion of conventional O -rings Reciprocating applications to eliminate spiral failure Reciprocating applications where low breakaway friction is required ; this Teflon cap used in conjunction with an 0 -r in g ; sizes smaller than 2-in. diameter require a split-groove housing ^PV is the pressure (p s i) exerted on the O -ring X the shaft ve locity (fpm ). This book presents information relative to standard elastomeric O -rin gs , but most of the design procedures and general design considerations can be applied to almost any elastomeric seal configuration. The sections on compounds and materials are of course, independent of cross-sectional configuration and applicable to other cross-sectional types. II. SIZE Elastomeric O -rin g seals have been standardized under the basic industrial standard dimensions of A S 568, Aerospace Standard pu b lished by the Society of Automotive Engineers, and a multitude of military standards; A N 6227 and MS28775 for general use; M25988, M83248, MS9020, MS9355, and MS29512 for straight-thread tube fittings; and MS28900 for electrical connectors. Most of the major O -ring manufacturers produce all the sizes specified in industrial standard AS568, as presented on Tables 13 and 22. Comparisons between the industrial and military standards are presented and discussed in Chap. 3. AN6227 (Table 2) is an Air Force-Navy Aeronautical Standard that covers 88 sizes of A S 568. MS28775 (Table 3) is the basic
Table 2. A ir Force-Navy Aeronautical Standard, Hydraulic ORings Packings ALL DIAMCTKB3 OF Cit038 SFCTIOM KUBT XQDAL ¥ „ i l l I iiili. -H I! ills m \ i«i iii ' l l ; 3Fi'Xii’ ir:<iTin;i nL-p-5su fob TnsTALurro*! di-t a i u ;. y.i'smtis 111 irc’f'.s. I ACCF.II’ADLK PRmvicri3 5V't; QPL-5516. © ATjSi'>inLY DRAWINGS PHAU S P tC irr AN62P7 c a l l o u t , CLASS B PACKIl ONLY IlY TIIFJH AUG2?7 ilU>U'EK WlTIIUU r ULFERGNCP, TO TYPK I), BUT REGAHDLKSS Of TO UK usf.n. uEiiC N A noN an6?2? i ' i s to b e u s 't - foh p a c k a g in g or s t o c k in g . CERTAIN PROVir.IOtiS OF THIS STANDARD ARE THE SUBJECT OF INTEWIATIONAL STANDAiiDITATIGN AGREE-MENT ASCC AIR STD 17/27 AND ST.ANAG 3U A - WHF.N REVISION OR CANCELLATION OF TH IS STAJJDARD I S PROPOSED, THE DEPARTMENTAL CUSTODIANS ’WILL INFORM THEIR RESPECTIVE DEPARTMENTAL STANOAliDIZATI'JN OFFICES SO THAT APPROPRIATE ACTiaJ MAY EE TAKEN RESPECTING THE INTERNAHONAL AGREEMENT CCNCErCiED. EXW.PLf; OK PART NO. t AN6227-32 - PACKTCG ’WITH LYTmiAL OD OK 2-3/8, ID OK 2 IfIClES, llATERJAL - CLASS B OF SPEC ttlL-P-5516. m ioWNQi— o»n oiff' op oc iaym b i n AaaoftwtMea a ha" w!ibP»ft» wev fal » - 3 -> s 8 © I 3 I© 6 s 3 © ? A IR F O R C E -N A V Y A E R O N A U T IC A L S T A N D A R D PACKING, "O" RING HYDRAULIC AN6227 Source: U.S. Government Printing Office, 251-520/6841 (1967).
Table 3. Military Standard, Preformed Packings (MS28775)
Table 3. (continued) : I I 5 I I I i s jl! Isi pi ill PART NUMBER MSM77HU MS2S776-112 MSMT7S-113 MS2<r77HU MS28775-11# MS2«776-m MSM775-117 MS23775 U8 MS2877V119 M828778-120 MS28778-121 MS2877M22 MS28776-123 MS2877V124 V4S28775-125 MS2877&-12« MS28776-127 MS2877S-128 MS28778-12« MS 28776-130 MS28776-131 MS28776-1S2 MS28776-133 34328776-134 3IS28776-1S6 MS28776-138 MS28776-137 MS28776-138 MS2877V139 31328776-140 M328776-141 34S2877V142 MS28776-143 MS28776-144 MS28776-146 34328776-14« 34328776-147 34328776-148 MS28776-14» T1S28776-160 MS28775-161 34328776-162 MS28776-16S MS28776-164 34528776-166 31328776-16« 34328775- 167 34328776- 16« 31328775- 169 31S3S776-160 31328776- 181 MS28776-163 MS2877S-168 M328776-1»« MS287T6-m 34328776-18« 34S28776.187 31328776-l«8 34S28776-1«« 34328776-170 34328776-171 MS28776-17» 3IS2S776-179 3IS2877V174 3482877V176 34328776-17« 34328776-177 14328776-178 FCO. SUF CLASS 5330 10 IN. MIN 0.419 0.482 0.544 0.607 0.86« 0.918 0.981 1.048 1.10« 1.168 1.281 1.298 1.36« 1.418 1.481 1.639 1.802 1.789 1.862 1.916 1.977 2.040 X102 2.166 2.227 2.290 2.362 2.415 2.477 2.602 2.6«0 2.722 riti 2.847 2.972 X222 3.472 3.722 3.972 4.722 4.972 6.214 «.714 «.9«4 7.207 7.467 7.707 7.967 8.207 8.467 8707 89«7 9.24n 9.467 9.707 MAX 0.429 0.492 0.564 0.817 0.679 1.118 1.180 1.243 1.306 1.634 1.747 1.809 1.872 1.936 1.997 2.060 2.122 2.186 2.247 2.310 2.372 2.435 2.497 2.560 2.622 2.690 2.752 1816 2.877 3.002 3.262 3.602 3.752 4.002 6.610 6.760 6.010 6.380 8.610 6.760 7.010 7.2«7 7.617 7.767 8.017 8.267 8.617 8.767 9.017 9.267 9.617 9.767 ID (mm) MIN 10.64 12.24 13.82 16.42 16.99 18.69 20.14 21.74 23.32 24.92 26.49 28.09 29.67 31.27 32.84 34.44 36.02 37.62 39.09 40.69 42.27 43.87 45.44 47.04 50.23 61.83 63.39 54 99 66.67 58.17 69.74 «1.34 62.92 64.52 66.09 67.6« 69.14 70.74 72.31 107.24 113.69 119.94 126.29 132.44 138.79 145.14 151.49 167.84 164.19 170.64 176.89 183.06 189.41 196.7« 203.11 206.M 314.81 331.16 227.61 233.8« 240.31 246.6« 10.90 12.60 14.07 16.67 17,25 1885 20.45 22.06 2362 25.33 26.80 2840 29.91 31.67 33.15 34,75 36.32 37 92 39.60 41.20 42.77 41.37 46.96 41 55 49.15 66.60 68.33 69,90 71.50 73.08 76.25 82 60 88.95 96 SO 101 66 108.00 114.36 120.70 127.06 133 60 139 96 146.30 16266 159.00 165.35 171.70 178.0« 164.58 190.93 197,28 203.83 200.98 216.33 223.68 239.08 236.38 241.73 248.08 T IN. 0.100 0.100 0.100 0 100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0,100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 amam am MAX 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.10« 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0 106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.106 0.10« 0.106 0.10« 0.106 0.10« T (mm) MIN 2540 2.540 2540 2 540 2.540 2.540 2.540 2.540 3.540 3.540 2.540 2.540 3.540 2.540 2.540 2.540 2640 2.540 2.540 2.540 3.540 2.540 2540 2.540 2.540 2.540 3.540 2.540 2540 2.540 2.540 2.540 3.540 2.540 2.540 2.540 3.540 3.540 2.540 2.540 2.540 2.540 2.540 2.540 2.540 3.540 2.540 2.540 2540 2.540 2.540 2.540 2540 2540 2.540 2.540 2.540 2540 2540 2540 2.540 2540 2540 2540 2540 2540 2692 2692 2.692 2.692 2692 2692 2.692 2692 2.692 2.693 2.693 2.692 2.692 2.693 2.692 2.692 2.692 2.692 2.692 2.692 2.892 2.692 2.692 2.693 2.692 X693 2.692 2.692 2.692 2.692 2.692 2.692 2.692 2.692 3.693 2.692 2.692 2.692 2.693 Z693 2.692 2.692 2.692 2.692 2.692 2.693 3.692 2.692 2.692 2.692 3.692 1692 2.692 1692 1692 1692 1692 1692 1692 1692 1692 1692 2.692 APPROX MASS LB/lOO Kg/lOO 1.124 1.154 1.184 @ ENTIRE STANDARD REVISED Ì OiWCm* ARMY-AV NAYY'AS INTCNNATIONAL INTCRCST ASCC l 7 / * 7 © ULIC, *f2 7 5 « F ,C 0 * RIR«) MIUTAIV STANDAID MS 28775 fROCUMUMfNt SFCCIFKATIOH l « IL - F - * » 7 3 t DD .31672*1 10
Table 3. (continued) f I ' ■ II I I» ! !i ■a¿ e èìì Ì* i III 111 111 Pò à F eo . SUF CLASS 5 3 3 0 PART NUMBER MS28775 Í0I MS:3775 202 MS28775-203 MS28773-204 MS28775-20S MSI8775 206 MS28775 207 MS2877S 208 MS28775-209 MS28775 210 MS28773-211 MS28775-212 M52877&213 MS2877S-214 MS2877S-21& MS2877S-216 MS28775-217 MS28775-218 MS2877S219 MS2877S-220 MS28775-221 MÜ2877S-222 ~ftS28775-223 K1S2877S-224 MS2877S-225 MS28775.226 MS28775 227 MS28775-228 MS28775-229 MS28775-230 MS28775-231 MS28775-232 MS28775-233 MS28775-234 MS28775-235 MS28775-236 MS287 75-237 MS2877S238 MS28775-239 MS28775 240 MS2877S 241 MS28775 2-12 MS2877S243 MS28775-244 MS28775-245 MS2877S-246 ^_MS2877S-247 MS28775-248 MS2877S-249 MS2877S-2S0 MS2877 5-251 MS28775-252 MS29775-253 MS28775-254 MS28775-255 MS28775 256 MS28775-257 MS28775-258 MS28775-259 MS2877 6-260 MS28775261 MS23775-262 MS2877S-2S3 MS28775-264 MS28775-265 MS28775-266 MS28775-267 MS28775-268 MS2877S-269 MS28775-270 ID IN. 0.186 0.229 0.291 0.354 0.416 0.479 0.541 0.604 0.666 0.728 0.790 0.853 0.915 0.978 1.040 1.415 1.478 1.699 1.724 1.849 1.974 2.099 2.224 2.349 2.474 2 599 2 719 2 844 2.969 3.094 3.219 3.344 3.469 3.844 3.969 4.094 5.211 5.336 5.461 5.586 5.711 5.836 5.961 6.211 6.461 6.711 6.961 7.204 7.454 7.704 7.954 8.204 8.454 8.704 8.954 MAX 0 176 0 239 0.301 0.364 0.426 0.614 0.676 0.740 1.177 1.240 1.302 1.427 1.490 1.619 1 744 1.994 2.119 2.244 2.749 2.874 2.999 3.124 3.374 3 499 3.624 3.749 4.749 4.874 4.999 5.132 5.257 5.382 5.507 5.757 5.882 6 007 6.257 6.507 6.757 7.007 7.264 7.514 7.764 ID (mm) MIN 7.39 8.99 10,57 12.17 13.74 15.34 16.92 18.49 20.07 21.67 23.24 24.84 26.42 31.19 32.77 34.37 35.94 37.54 40.81 43.79 46.96 50.14 53.31 56.49 69.66 62.84 66.01 69.06 72.24 75.41 78.59 81.76 84.94 88.11 91.29 94.46 97.64 100.81 103.99 107.16 110.34 113.51 116.69 119.86 123.04 126.21 129.16 132.36 135.53 138.71 141.88 170.48 176.81 132.98 189.33 196.68 202.03 208.38 214.73 221.06 227.43 12 42 14.00 15.60 17.17 18.80 20.37 21.97 23.55 25 15 26.72 28.32 29.90 31.50 33.07 34.67 36.25 37.85 41.12 50.65 53.82 57.00 60.17 63.35 66.52 69.82 73.00 76.17 79.35 82.52 55.70 88.87 92.05 95 22 98.40 101.57 104.76 107.92 111.10 114.27 117.45 120.62 123.80 126.97 130.36 133.53 136.70 139.88 143.06 146.23 149.40 152.58 158.93 165.28 171.63 177.98 184.51 190.88 197.21 209.91 216.26 222.81 228.96 T IN. MIN 0.135 0.136 0.135 0.136 0.135 0.136 0.135 0.135 0.135 0.136 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0 135 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0 135 0.135 0.135 0.135 0.135 0.136 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0 135 0 135 0.135 0.136 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0.135 0.136 0.136 0.135 0.136 0.136 0.136 0.136 0.135 ai36 0.136 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 C.143 C.143 C.143 C.143 C.143 C.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0,143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0143 0143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 ai43 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 T (mm) 3.429 3.429 3.429 3.429 3.429 3.429 3.429 3.429 3.429 3.429 3.429 3.429 3.429 3.429 3.429 3.429 3.429 3.429 5.429 1429 1429 3.429 1429 1429 1429 3.429 1429 3.429 1429 1429 3.429 1429 1429 1429 1429 3.42« 1429 3.429 1429 3.429 1429 1429 3.429 3.429 3.429 1429 3.429 1429 3.429 3.429 1429 3.429 1429 1429 1429 1429 1429 3.429 1439 3.832 1832 3.832 1632 1632 1632 1632 3.632 1632 3.632 1633 1633 1632 1632 3.632 3.632 1632 1632 1632 1833 3.633 1632 1632 1632 1632 1632 3.633 1632 1633 1633 1632 3.632 1632 1632 1632 1633 1632 3.632 3.632 1632 3.632 1632 1632 3.632 1632 1632 1632 1632 3.632 1632 3.632 3.632 1632 1632 1632 1632 1632 1632 1632 1632 1632 1632 1632 1632 S.632 1632 1632 1632 @ ENTIRE STANDARD REVISED A P P R O X M A S S LB/tOO K yiO O .082 .096 .109 .123 .383 .411 .438 .466 .493 .529 1.161 1.179 1.206 1.233 1.280 1.607 L682 1.617 1.672 1.726 .274 .286 .298 .706 .733 .761 P.K «2 OiW Gal a r m y-AV n a v y -AS in te r n a tio n a l INTEREST ASCC 17/27 © TITLE PACKINO, PRCFONMCO, HYDRAULIC. 4'27S*F, ("O* RINO) MUITAIY STANDAID MS 28775 FROCUHflieHT SFfCiFXUTlOM M IL -F - 2 5 732 SCFCRSeOCSc M S 2 3 7 4 4 SHEET OF 3 6 DD S72-1 n
Table 3. (continued) III 2 1 1 i m55 i I PART NUMBER y«2»77s.rM '•iS M V i-rji M a w m -in ¥SM776-r4 MSW77H7» MsyrT7tt7« KS2»77M77 MS2877 6-278 MSJr77M7* KS7S7n-380 KS3S77S-281 MS38778-283 Km77ft-3è» MS2Í77J-2M MSU77&^ MS2877M10 MS387764U HS3877M1S US2877M1S MS1S776-318 MS38778417 MS2877S.S1Í MS7877M1» M538776-330 MS2877&-321 MS2877M33 MS2877MÍJ MS2877WJ4 MS28776-S3& M52«773^M MS2877W27 MS2877MÍ8 MS3r77$-32* KS38775-330 MS7r773^31 US2877t-MtM528773‘3a3 M£28776.SS4 MS2877S-3J8 MS2B77&-33II MS2877S4â7 MS287734M MS2877S439 MS2877S^ US3877 3-341 KS28776^3 MS28773-343 KS2877M44 MS28775-34S MS28773444 MS28773347 *e2«77344â MS28773-34« MS2S77S-3M US3977$-Mt KS2S77S-4U US3877MM MS3877MM MS3T77MM WS3«17Mft7 us3rnv3M KS2<77MM KS3S77M«« M33977S-M1 MS3*77«-38> M83STT(-MI Ka3rT73-3«4 MS2r77V3W reo. uj^ CLASS 5 330 ID \ n . MIN 9.204 9.454 9.704 9.9(4 10.4(4 10.9(4 11.4(4 11.9(4 12.9(4 13.9(4 14.9(4 K.910 ie.910 17.910 0.407 0.470 0.(32 1.16« 1.219 1.281 1.690 1.7K 1.840 t.9«5 2.090 1216 1340 2.466 1590 1710 1835 2.960 3.086 3.210 3.336 4.006 4.210 4.338 4.400 4.900 6.0T7 (.202 6.M7 6.462 6A77 1.709 (.827 6.962 6.302 6.462 6.702 6.962 MAX 9.6l4 9.754 10.014 10.614 n o w 11.614 11014 13.014 14.014 16.014 16.000 17.000 18.000 0.417 0.480 0.642 0.606 0.««7 0.85« 0.918 0,981 1.043 1.10« 2.236 1360 I486 2.610 2.740 2.990 3 116 3.240 3.365 3.490 3.616 3.740 4.990 6.123 6.248 6.373 6.498 6.623 6.748 (.873 6.99« 6.248 6496 6.748 6.99« ID ( m n ) MIN 233 78 240.13 248.48 262.83 2S6.63 278.23 290.98 308.(3 379.83 404.11 429.61 4(4.91 10.34 11.94 13.61 16.11 24.61 26.19 27.79 29 3« 30 9« 32.54 34.14 37.21 40.39 43.6« 46.74 49.91 53.09 56.2« 69.44 62.61 65.79 68.83 72.01 75.18 78.» 81.53 84.71 87.88 91.0« 94.23 97.41 100.68 103.7« 10«.98 110.11 113.2« 118.4« 119.(3 122.81 126 96 128.9« 13213 161.18 167.63 1(3.88 17023 176.56 MAX 2 ,15 ‘A 241 M 24 8 01 264 7« 267.06 279.76 292 4« 306.16 330 5« J55.96 581 3« 406.10 4SI 90 457.20 10.5» 12.19 13.77 15.37 16.94 21.74 23 *2 24.92 2«49 28.0» 2967 31.27 32.84 47.24 50.42 63.59 56.77 5994 63.12 66.29 69 60 75 95 79.12 8Z30 85.47 88.66 91.82 95.00 98.17 101.36 104 5 2 107.70 no.n 114.06 117.22 120.40 113.67 136.76 1 ».1 2 133.» 136.47 139.64 143.83 144.00 141.17 162.3« 158.70 163.0« 171.40 m.T6 T IN. Q.U5 0 136 0.135 0.135 0.136 0.135 0.135 0.205 0.205 0.206 0.206 0.206 0.206 0.206 0.205 0.206 0.205 0.206 0.206 0.206 0,206 0,206 0.206 0.205 0.205 0.206 0,206 0.206 0.20« 0.20Í 0,206 0.20« 0.205 0.206 0.206 0.206 0.206 0.206 0.206 0.206 0.206 0.306 MAX 0U3 0,143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.143 0.216 0.216 0.21$ 0.215 0.216 0.215 0 215 0.216 0216 0.215 0.215 0215 0.215 0.215 0.216 0.215 0.215 0,215 0.Î15 0.215 0.215 0.215 0.215 0 215 0.215 0.215 0.215 0215 0.215 Ó.215 0.215 Ó.215 0.215 0.215 0.216 0.216 0.216 0.216 0.316 0316 0.216 0.215 0.215 0.216 0.316 a316 0.216 0.315 0J16 T (mm) MiN 3 429 3.429 3 429 3 429 3429 3.429 3.429 3.429 3 429 3.429 3.429 3.429 3.429 3.429 3.632 3.632 3632 3.632 3.632 3632 3 632 3.632 3.632 3.632 3.632 3.632 3.632 3.632 6.46 Ï.46 6.46 5.46 5.46 5.48 5.46 5.46 6.46 6.46 6.46 6.46 6.4« 6.4« 6.44 5.4« @ ENTIRE STANDARD REVISED APPROX MASS LB/lOO Kg/lOO 2.056 2.U0 2 1S6 2 220 2.329 2.439 2.649 2658 2.878 3.097 3.317 3531 3.751 3.968 1.532 1.594 1.657 1.970 2.032 2.095 2.157 2.220 2.282 2.346 2.412 2.474 2.537 2.600 2.6«2 1725 2.788 2.851 2.913 2.978 3.038 3.101 3.22« 3U1 3.477 3.603 1.10« 1.156 1.206 1.305 1.406 1.602 1.701 1.800 Othar Cm * NAVY-AS ¡HTERHATK)HAL MTCnCST ASCC 17/27 © MCKIMt, PACPOftMEO , HYOAAULIC, 27S«F, Co* RIN9) MILITAIT STANDAIO MS 28775 W »0CL»O «K T s r e o f ICAYIOW M IL -9 -2 9 7 9 2 DD 672-1 1 2
Table 3. (continued) : I ' S► «5 ÏM ^ it • ^ l I ! ifj ^si IJi iP 1115«sl PART NUMBER MS2r775-S« MSî»775-3«7 MS2«775-34a MS2Tf7S.3«» MS28775-370 MS28775-371 MS3877S-372 MS28776-373 MS2877VS74 MS28773-S75 MS2877S.376 MS2877S-S77 MS2877S.378 MS3877S-379 MS2877J.S80 MS1877S-381 MS28775-382 MS2S775-383 MS28775-384 MSa8778-385 MS2877i-SM MS387T&.387 MS28778^ MS2S77V389 I4S2877S-390 MS2S775-391 MS2S778.M2 MS28778^3 MS28T7V394 MS28775-395 MS2877S423 MS2877V4M MS2B77S-42T MS2877M28 MS2877M29 MS2877M30 MS28775-431 MS2877S-432 MS23775-»33 MS2877S-434 MS28778-43S MS2877 W38 MS2877M37 MS28775-438 MS28778-439 MS2877V440 MS287 7 5-441 MS28775-442 MS28775-443 MS2877M44 MS287T3-44S KSM7TI.44« M92S77M47 MS2S773-448 MS2877V449 MS28775-450 MS2877V4S1 MS2877M83 MS2877MM MS2877M84 MS2877946« B4S28775-4U MS287TS-497 MS28775-488 M52877 3-459 MS2877S-480 MS2877W81 3(S28773-i«3 MS38775-tft3 MS28775-484 MS28773-483 PEO. SUE CLASS 5330 10 IN. 7.895 7.945 8,195 8945 9.m 9.443 9.896 9.945 1844$ 10.945 11.445 11.94$ 1Z945 13.945 14.945 15.910 16.910 17.910 18.910 19.910 30.910 21.910 32.880 23.880 24.880 25.880 5.302 5.327 5.452 5.577 5.702 5.952 6.202 6.452 6.702 6.953 7.195 7.445 7.695 7.945 8445 8.945 9.445 9.945 10.445 10.945 11.445 11.945 13.445 12945 15.445 16.910 16.410 16.910 17.410 17.910 7 256 7 506 7.756 8006 8 506 8756 9.005 9.255 9.506 9.765 10.006 10 506 11.006 11.505 12.006 13.006 14006 15.006 16.000 17.000 18000 19.000 30.000 21.000 22.000 23.000 24.000 25.000 26.000 5.873 5.998 6.248 6.498 6.748 8506 9.006 9.506 10.006 10.506 11.006 11.506 12006 12506 13.006 14.006 14.506 15.006 18506 16.000 18.500 17.000 17.600 18000 10 (mm) MIN 18276 189.10 195.45 301.80 208.15 214.50 220.36 237.20 235.56 239.90 246.35 25260 366.30 273.00 290.70 803.40 328.80 354.20 379.60 404.11 566.51 581.2 606.6 6320 657.4 113.28 116 46 119.63 12281 125.98 128.96 132.13 135 31 138.48 141.66 144.83 148.01 151.18 157.53 163.88 170.23 21450 227.30 239.90 252.60 365.30 278.00 290.70 303.40 316.10 33880 341.50 354 30 366.90 379.80 393.30 404.11 416.81 429.51 44231 454.91 184.28 190.63 196 98 303.33 209 68 316.03 22238 228.73 235.06 241.43 247.78 254.13 266.83 279.53 29223 304.93 380.33 356 73 381.13 406.40 431.80 457.20 48X60 50800 533.40 558.80 584.2 609.8 635.0 660.4 114.06 117.22 120.40 123.57 126.75 130.12 133 30 136.47 139.65 14283 146.00 149.17 153.35 158.70 165.06 171.40 177.75 184.28 190 63 196.98 303.33 31803 22878 341.43 254.13 366.83 379.53 29223 304.93 317.63 330.33 34X03 366.73 86843 381.13 39X83 406.40 419.10 431.80 444.50 457.20 T IN. 0.306 0.206 0.206 0.306 0.206 0.206 0.206 0.206 0.206 0.206 0.205 0.206 0.206 0.205 0.206 0.206 0.206 0.205 0.206 0.206 0.206 0.206 0.206 0.205 0.306 0.206 0.269 0.269 0.269 0.269 0.289 0.269 8269 0.269 0.269 0.269 0.369 0.269 0.269 8269 8269 8215 0.216 8216 0,215 0.215 0.215 8216 0.215 0.215 0.215 0215 8215 0.215 8215 0.216 8215 0.215 0.215 0.216 0.215 8215 8315 0.215 0.216 0.215 8215 0.216 8215 8215 0181 0.2*1 0.281 8281 0.391 0.281 0.281 8281 8381 8381 8381 8281 0.381 8381 8281 8381 8281 8281 8381 8381 8281 8381 8181 0.381 8281 8381 8381 T (mm) 6.63 6.63 6.63 6.63 883 861 5.46 6.46 846 846 846 846 846 846 846 846 8 U 846 844 846 846 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 7.14 (9 ) ENTIRE STANDARD REVISED APPROX MASS L8/ I 0 0 Kq/lOO X736 3.854 3.979 8104 4.229 4.480 8606 8731 866« 8107 83M 8606 5.8M 8110 8611 7.111 7.614 8106 8607 9.106 9.609 10.111 10.613 11.114 11.608 1X109 1X610 1X112 4.1B6 4.392 4.999 4.506 4.614 4.935 8043 8150 8357 5384 8579 8794 8008 6.233 8438 8653 7.510 7.940 8369 8796 9.227 10.515 18944 11.373 1X961 18991 18831 18361 18661 X033 X088 X146 X30S X358 XI17 X490 X544 X658 1771 X»98 X338 6.464 8676 8904 8131 8668 86M 8614 8041 8366 8493 8730 8946 xa»6 1.947 L»M X044 X093 X141 X190 X399 X3S7 X996 X433 X531 1638 X726 XB33 Xtao 8017 X116 X313 X407 X603 X796 8991 8166 8990 8671 8778 8548 8743 8998 8163 8733 8918 7.111 I il OWCm* AAMY-JIV MAVY-AS INTCmtATIOMAL INTCnCST PACKiM«.f»nCFOMMEO, HTORAULIC. -f 2 7 5 *P , MILITAIT STANDAID MS 28775 nroCUMEMEMT SPCOPICAT10N SUTEffSCOESi M IL -P > 2 9 7 9 2 W 9 X 9 7 t4 DO 672-1 fCMrtfJMtW) 13
Table 3. (continued) FED. W F C tA S i 5 3 30 In IH 2 I II h i I 111 ilf i! lu O-RINC SIZES -013 THKOUGH -023, -117 THROUGH -149, AKD -223 THROUGH -247 ARE HfTENDED OHLY FXIR USE AS STATIC SEALS, AM) ARB NOT TO BE USED IN APPLICATIONS INVOLVING RECIPROCATING OR ROTARY IHVOLVQtENT. EXAMPLE OP PART NO. MS28775-211 - PACKING UITH ACTUAL ID DIA .796 IN ., T DIA .139 IN ., OR 20.22 MM ID DIA, 3.530 MM T DLA. RINGS MAY BE OPF-RECISTER, DUE TO MOLD MISALICNMEViT. NOT TO EXCEED 0.003 INCH, PROVIDED ALL CROSS-SECTIONAL DIAMETERS. INCLUDING THE PROTRUSIONS (PLASH EXCLUDED) OF BOTH HALVES, WHERE APPLICABLE, SATISFY "T" DIMENSIONS. CERTAIN PROVISION (DIMENSIONS FOR SIZES -001 THRU -050, -106 THRU -178, -210 THRU -281, -325 THRU -349, -425 THRU -460) OP THIS STANDARD ARE THE SUBJECT OF INTER.9ATI0NAL STA.HDARDIZATION .\GREEMENT ASCC AIR STD 17/27 AND NATO STANAC 3444. WHEN REVISION OR CANCELLATION OP THIS STANDARD IS PROPOSED WHICH WILL LFFECT OR V10L.4TE THE INTERNATIONAL AGREEMEWT CONCERNED, THE PREPARING ACTIVITY WILL TAKE APPROPRIATE RZCONCILIATICN ACTION -naCUCH INTERNATIONAL STANDARDIZATION CHANNELS, INCLUDING DEPARTMENTAL STANDARDIZATION OFFICES. IP REQUIRED. © ENTIRE STANDARD REVISED O W C m i XAVY -AS IMTCNNATIONAL IHTERtST A$CC 17/27 MC«IN«,MCF0*MC0, MYOdAULIC, + J7J*F,(V«1»«) MILITAIY STAJIOAID MS 28775 »tC XXVfttita 3«CIF)CATJOH SUTCmCDCS; M tL -P -2 S 7 3 2 M 3 2 a 7 a 4 DD 672-1 Source: U.S. Government Printing Office, 703-023/3232 (1981).
(/) Table 4. O-Rings for Tube Fittings PARKER SERIES 3-XX 0 -R IN G SIZE CROSS-REFERENCE TABLE These O -rin gs are intended for use with internal straight-thread flu id connection bosses and tube fittings. Ref. AND 10049, AND 10050, MS33656, MS33657, SAE straightthread 0 -r in g boss and mating swivel and adjustable style fittings.* O -rin g series Compound specification Parker compound no. M25988/l^ M25988/3a M25988/43 M83248/1 M83248/2 Sequence A MIL-R-25988 Cl. 1, Gr. MIL-R-25988 Cl. 1, Gr. MIL-R-25988 Cl. 1, Gr. MIL-R-832448 Cl. 1 MIL-R-83248 Cl. 2 70^ 60a 80^ L 737-65b L806-80b V747-75 V709-90 Sequence B MS9020 MS9355 MS29512 AMS7271 AMS7272 MIL-P-5315 N506-65 N287-7Qb N602-70
Table 4. (continued) O -r in g series Compound specification Parker compound no. Sequence C AN6290(OBS) MIL-P-5510 N 507-90 MS28778 MIL-P-5510 N 507-90 NAS617 MIL-R-7362 47-071 NAS1595 MIL-R-25897, T y . 1, Cl. V747-75 NAS1596 MIL-R-25897, T y . 1, C l. 2^ V-709-90 NAS1612 NAS1613 E515-80 1 2 3 4 5 6 7 8 9 10 11 12 13 Metric O -r in g size (mm) 0 -r in g size—actual^ per ARP 568 (in . ) Sequence A and AS568 dash no. Sequence B dash no. Sequence C dash no. f Tolerance^ Tolerance^ 3-XXd size no. Tube OD (r e f . ) Class I Class II ID ± ± w ± ID Class I Class II ± ± w ± 3-901 -901 -0 1 3/32 4.70 .13 .15 1.42 .08 .185 .005 .006 .056 .003 3-902 -902 -0 2 - 2 1/8 6.07 .13 .18 1.63 .08 .239 .005 .007 .064 .003 3-903 -903 -0 3 - 3 3/16 7.65 .13 .18 1.63 .08 .301 .005 .007 .064 .003
3-904 3-905 3-906 3-907 3-908 3-909 3-910 3-911 3-912 3-913 3-914 3-916 3-918 3-920 3-924 3-928 3-932 -904 -905 -906 -907 -908 -909 -910 -911 -912 -913 -914 -916 -918 -920 -924 -928 -932 -04 -05 -06 -07 -08 -09 -10 -11 -12 -13 -14 -16 -18 -20 -24 -28 -32 - 4 - 5 - 6 - 8 -10 -12 —14^ -1 6 -2 0 -2 4 -2 8 -3 2 1/4 8.92 5/16 10.52 3/8 11.89 7/16 13.46 1/2 16.36 9/16 17.93 5/8 19.18 11/16 21.92 3/4 23.47 13/16 25.04 7/8 26.59 29.74 1- 1/8 1-1/4 1- 1/2 1-3/4 2 34.42 37.47 43.69 53.09 59.36 .13 .13 .13 .13 .13 .13 .13 .13 .15 .15 .15 .15 .15 .25 .25 .25 .25 .18 1.83 .08 .351 .18 1.83 .08 .414 .18 .18 .23 .23 .23 .23 .23 .25 .25 .25 .30 .36 .36 .46 .46 1.98 2.08 2.21 2.46 2.46 2.95 2.95 2.95 2.95 2.95 2.95 3.00 3.00 3.00 3.00 .08 .08 .08 .08 .08 ,10 ,10 ,10 ,10 ,10 10 10 10 .468 .530 .644 .706 .755 .863 .924 .986 10 1.047 10 1.171 1.355 1.475 1.720 2.090 2.337 .005 .005 .005 .005 .005 .005 .005 .005 .006 .006 .006 .006 .006 .010 0.10 0.10 0.10 .007 .072 .007 .072 .007 .078 .007 .082 .009 .087 .009 .097 .009 .097 .009 .116 .009 .116 .010 .116 .010 .116 .010 .116 .012 .116 .014 .118 .014 .118 .018 .118 .018 .118 .003 .003 .003 .003 .003 .003 .003 .004 .004 .004 .004 .004 .004 .004 .004 .004 .004 *AND 10049 and AND 10050 were canceled Dec. 14, 1966. ^Specification M IL -R -25988 requires special documentation. ^Nonstandard compound. Made to order only. ^Specification inactive for new design. ^The ru bber compound must be added when ordering by the 3- size number ( i . e . , 3-910 N552-90). ^Material with unusual shrinkage during molding will give slightly different dimensions. ^Class II tolerances apply to columns 13 and 14 (M83248/1 and M83248/2) and to M25988/1, M25988/3, NAS1593, NAS1594, NAS1595, and NAS1596. However, AS568 A , revision A , established a single set of ID tolerances. This was agreed on by the A ir Standardization Committee (membership by the United States, Australia, Canada, New Zealand, and the United Kingdom). ™S28778 only. Source: 0-R in g Handbook OR5700, Parker Seal C o ., Lexington, K y ., January 1977.
18 Chap. 1. Basic Configuration Table 5. O-Rings for Electrical Connectors MS28900 a Parker Size No. ID W - 8 -10 -12 -14 -16 -18 -20 -22 -24 -28 -32 -36 5-133 5-134 5-135 5-136 5-137 5-138 5-139 5-140 5-141 5-142 5-143 5-144 0.332 0.410 0.526 0.643 0.775 0.898 0.987 1.112 1.226 1.450 1.670 1.891 0.005 0.005 0.005 0.005 0.006 0.006 0.006 0.006 0.006 0.010 0.010 0.010 0.031 0.031 0.031 0.031 0.031 0.031 0.031 0.031 0.031 0.047 0.047 0.047 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 ^Rubber material for MS28900 0 -r in g s— Parker Compound C 557-70 (Specification AMS3209). Source: 0-R ing Handbook OR5700, Parker Seal C o ., Lexington, K y ., January 1977. standard on which AS568 was developed. M25988, M83248, MS9020, MS9355, and MS29512 cover 31 0 -r in g s of slightly larger diameter cross sections to be used for sealing straight-thread tube fittings. These O -rings are usually referred to as "3 dash 9” Orings , as shown in Table 4, and are equivalent to dash numbers 901 through 932 of A S 568. They are used in gland designs specified by military standards MS 16142, MS 33649, and MS33656 for tube fittings. Table 5 presents the usual seals used in gland designs for electrical connectors under MS28900. The specific dimensions for the glands required by these 0 -r in g sizes are presented under the Specific Applications of Static and Dynamic Seals. Most 0 -r in g sizes have been specified such that the dimensions of the gland in which they will be installed meet standard machine tooling. Therefore, a female gland seal will have a standard bore diameter, requiring common tooling so as not to increase machining costs. 111. COMPOUNDS AND MATERIALS Elastomeric 0 -r in g seals are generally composed of at least two monomers linked end to end to form long-chain molecules. The
Table 6. Comparison of Properties of Commonly Used Elastomers^ Parker Compound Number Prefix: N G D B C H E V L I R A T P S Y Z cC C CQ u o 'ti s in cC c CQ u o cli CQ in o c '5 cs CQ CQ o c 0) u cx o 0) z n 0) ta d o ^ (U 3CO j:; o i in -C 'o O a. 0) o C c o S >> a, 5 2 w cx c o -Q cc o o § s o c o o 3 'coOU o 3 E 0» cOJ u a oCO u CD Si Si 3 Id 3 "S z 0) 0 cd >> 1 CD XJ io: 3 CO o Ph o c cd £ CDU 3 o CU CD COO 'in c 'u xs £ 2 o s o a w Ozone resistance p P P GE GE E E E E p p E E E E E Weather resistance F F F GE E E E E E F F E E E E E Heat resistance G FG F GE G G E E E F F E P F E FG Chemical resistance FG FG FG E FG E E E E FG FG P G F GE G Oil resistance E P P P FG F P E G P P E E G PG E Impermeability G F F E G G G G P F F E E G P GE Cold resistance G G G G FG FG GE FP GE G G P G G E GE Tear resistance FG FG GE G FG G GE F P GE GE FG P GE P G Abrasion resistance G G E FG G G GE G P E E G P E P G Set resistance GE G G FG F F GE GE GE G G F P F GE PF Dynamic properties GE G F F F F GE GE P F E F F E P G Acid resistance F F FG G FG G G E FG FG FG P P P FG FG Tensile strength GE GE E G G F GE GE F E E F F E P G Electrical properties F G G G F F G F E G G F F FG E F Water/steam resistance FG FG FG G F F E FG F FG FG P F P F F Flame resistance P P P P G G P E G P P P P P F FG Key: P , poor; F, fair; G , good; E, excellent ^See Charts lA - lD and Table 11 (p p . 55-63) for additional information. Source: 0-R ing Handbook OR5700, Parker Seal C o ., Lexington, K y . , January 1977. n o 3 ■D O c 3 a U) £U D a Q} r + a>
20 Chap. 1. Basic Configuration molecules are in turn linked together by the vulcanization process. Vulcanization determines the number of molecules to be linked together: this determines the strength and elasticity of the seal material. The chemical structure of the monomer in the molecular chain determines the material’s resistance to deteriorating influences such as heat, cold, oils, solvents, and other chemicals. Many catalysts and compounds may be added to the basic monomers to affect either the strength or chemical characteristics of the final material. Such additives as curing agents, accelerators, fillers, reinforcing carbon blacks, process aids, antioxidants, and plasticizers are introduced into the mixing and vulcanization pro cess at specific times and temperatures to influence the finished product. Table 6 presents a comparison of properties of the most used elastomeric materials. This table gives a good indication of the various limitations of each material, but applications involving combinations of chemical, oil, and heat resistance require further investigation. For example, ethylene propylene has an excellent rating under chemical resistance, while nitrile or Buna-N has a fiar to good rating. But if the particular application calls for sealing a chemical fluid that also contains a mineral oil ingredient, the ethylene propylene seal will fail (d isso lve ), while the nitrile seal would be acceptable. Of course, in this case, a fluorocarbon seal would be the first choice, if available. Many seal sizes and configurations are not readily available in all estomeric materials. The most common elastomeric materials are nitrile or B u n a -N , buty l, neoprene, and ethylene propylene. These, and each of the other materials shown in Table 6, are discussed below. 1, Nitrile or Buna-N Rubber: More nitrile seals are used than all the other elastomers combined, since nitrile is the most versa tile material. Nitriles are a copolymer of acrylonitrile and butadiene [1 , p . 60] . As the acrylonitrile content of nitriles increases, the oil and fuel resistance increases while the low-temperature flexibility decreases. N itrile-base elastomers are usually specified by military MS and AN O -rings when used in oil and fuel applications, but because nitrile compounds vary widely within such a large overall temperature range, particular attention should be paid to specifying physical properties. Materials can be formulated to perform satisfactorily over the temperature range —65 to +300°F, so it is necessary to make sure that the particular nitrile chosen meets the temperature requirements of the application (see Fig. 2 ). The nitrile materials are recommended for general-purpose sealing of alkaline and salt solutions, petroleum oils and fluids, vegetable and diester oils, silicone greases and oils, ethylene
° F 150 -1 0 0 -8 0 -6 5 -5 5 -4 0 -2 0 0 -10 °C -102 -73 -62 -48 -4 0-2 9 -18 -54 -23 G E N E R A L L Y S U IT A B L E FOR A T LEAST 1000 H O U RS EXPOSURE A T H IG H E S T T E M P E R A T U R E (1) T R A D E M A R K E. I. DuPO NT DE N E M O U R S & CO., INC. 180 225 250 275 3 00 350 375 4 0 0 450 82 107 121 135 149 177 188 204 232 SP E C IA L S IT U A T IO N C A P A B IL T IY ; V A R IE S W IT H M E D IU M A N D E N V IR O N M E N T A L C O N D IT IO N S F ig u r e 2. Temperature capabilities of principal elastomers employed in seals (From 0-R ing Handbook, OR5700, Parker Seal C o ., Lexington, K y ., January 1977)
22 Chap. 1. Basic Configuration glycol-base fluids, alcohols, gasolines, and water. They are not suited for use with strong oxidizing agents; chlorinated solvents such as carbon tetrachloride or trichlorethylene, nitrated hydrocarbons such as nitrobenzene or aniline; phosphate esters such as Skydrol, Fyrquel, or Pydraul; acetates; keytones such as methyl ethyl ketone (MEK) and acetone; and aromatic hydrocarbons. Ozone will usually attack nitrile materials, but resistance can be greatly improved by the addition of antiozonant compounds. 2. SBR or Buna-S : Although styrene-butadiene rubber (S B R ) and natural rubber account for approximately 90% of the world’s total rubber consumption, very little of these two materials is used in seals. SBR is a copolymer of styrene and butadiene and has been referred to as government rubber styrene (G R S ) since it was developed during World War II. The butadiene/styrene ratio determines the low-temperature characteristics of the material. SBR seals have been used in automotive brake systems, in systems employing alcohols and water, and to a limited extent in systems exposed to nitroglycerides. The material functions within a temperature range common to other natural and early synthetic rubber products such as butadiene and polysulfide: —65 to +255°F. SBR is not recommended for petroleum oils, or in sy stems exposed to sunlight. 3. Butadiene Rubber: Polybutadiene is an elastomer with physical properties slightly less than those of natural rubber. Its low-temeprature characterists have been improved over natural rubber by special compound additives. Butadiene is used primarily by the tire industry. 4. Butyl Rubber: Butyl rubber is a petroleum material made by compounding isobutylene and isoprene. Brominated and chlorinated butyl rubber are also available and are prepared by select replacement of hydrogen with bromine or chlorine [2 , p. A3-31 . These materials have very good resistance to ozone, vege table oils, some mineral acids, ketones, phosphate ester hydraulic fluids such as Skydrol, Fryquel, and Pydraul, and silicone fluids and greases. Butyl is not recommended for petroleum oils or diester-base lubricants. The elastomeric industry is currently recommending the use of ethylene propylene rubber instead of butyl for phosphate ester application. Butyl rubber has excellent resistance to gas permeation and is extensively used in vacuum chambers and gas containers. Its ability to absorb energy in vibration-damping applications has led to its use in isolation mounts and dynamic stop systems. 5. Neoprene Rubber of Chloroprene: Neoprene rubber is one of the earliest synthetic materials used by the seal manufacturers.
Compounds and Materials 23 It is a homopolymer of chloroprene possessing resistance to weather elements of ozone, oxygen, and sunlight. Unlike most elastomers that either resist weather or petroleum products, neoprene has limited resistance to both. Because of this and its rather broad temperature range, it is the usual choice in compromising applications. Neoprene materials are used to seal dilute acids, bases and salts, straight-chain hydrocarbons, high-aniline-point petroleum oils, vegetable oils, alcohols, and silicate ester lubricants. Neoprene is used extensively with refrigerants of Freon and ammonia, but is unsatisfactory for service in aromatic hydrocarbons, chlorinated solvents, esters, and ketones. 6. Chlorosulfonated Polyethylene (C SM ) : As the name implies, this polymer is produced by compounding polyethylene with chlorine and sulfur dioxide. The chemical reaction of chlorine and sulfur dioxide transforms the thermoplastic polyethylene into a synthetic rubber. The addition of curing agents and accelerators in the vulcanization process produces elastomers that have excellent resistance to ozone, weather, and oxidizing chemicals. Chlorosulfonated polyethylene (trade name Hypalon) has only fair set-resistance qualities and is therefore not recommended for dynamic seal applications. 7. Ethylene Propylene Rubber (EPM, EPDM, EPR): This elastomer is a copolymer of ethylene and propylene and is sometimes compounded with a third monomer (E P T ). Good to excellent compression set resistance is obtained by the addition of peroxide cures during vulcanization. Ethylene propylene materials have excellent resistance to phosphate esters such as Skydrol, Fyrquel, Pydraul, water and steam, acids, alkali, salt solutions, ketones, alcohols, glycols, and silicone oils and greases. EPR has very poor resistance to petroleum oils and diester-base lubricants. Ethylene propylene is a close contender to Buna-N and butyl in the important sealing properties, except that it does not have the petroleum oil and fuel resistance of Buna -N , nor the low -gaspermeability quality of butyl [1, p . 61]. 8. Fluorocarbon Rubber (FKM) : Fluorocarbon elastomers have been compounded to meet a wide range of chemical and physical requirements. Under the trade names Viton, Fluorel, and Kel-F, fluorocarbon seals have been employed where other materials cannot survive severe chemical conditions. The working temperature range of FKM is between -2 0 and +400®F ( -2 9 and +204°C) and limited temperature spikes of 600°F have been incurred. New compoundings have greatly improved the compression set of fluorocarbon 0 -r in g seals.
24 Chap. 1. Basic Configuration Fluorocarbon elastomers have good resistance to the swelling and deteriorating effects of aromatic solvents, aliphatic hydrocarbons, halogenated hydrocarbons such as carbon tetrachloride, trichloroethylene, diester oils, silicate ester oils, petroleum oils, and many mineral acids. They are also highly recommended in applications involving ozone combined with heat, as in electric motors and electrical equipment. Fluorocarbons are not recommended for use with highly polar fluids such as hydrazine, ketones, phosphate esters like Skydrol, and anhydrous ammonia, and are also not recommended with low-molecular-weight esters and hot hydrofluoric or chlorosulfonic acids. 9, Fluorosilicone (FSi, SLS) : Fluorosilicone polymers are made by replacing the methyl side groups on the silicone polymer chain with fluorinated side groups. This produces a material risistant to hydrocarbon fuels and oils at both high and low temperatures. The primary uses of fluorosilicones are in fuel systems at temperatures up to 350^F (177 °C ), and in applications where the dry-heat resistance of silicone is required , but the seal may be exposed to petroleum oils and/or hydrocarbon fuels [2, p. A 3 -5 ]. Because of fluorosilicone’s poor dynamic properties, fluorosilicone seals are used only for static seal applications. There is a current effort in the seal industry to color-code fluorosilicone seals blue to distinguish them from the normally colored red silicone seals. 10, Isoprene Synthetic Rubber ( IR, SN) : Polyisoprene materials are equivalent in chemical and physical properties to natural rubber, except for some limitations when used in dynamic applications. Isoprene seals have excellent tensile strength and abrasion resistance, but because isoprene has only fair dynamic properties, it is not recommended for rotary or reciprocating seal applications. 11, Natural Rubber (NR): The majority of natural rubber used today is produced by the Hevea brasiliensis tree found in the Far East and Brazil. Nautral rubber has excellent physical resistance to abrasion, tension, dynamic distortion, and cold flow. Natural rubber seals are currently being replaced by synthetics that can be compounded to better resist sunlight, oxygen, ozone, solvents, and oils. Natural rubber seals are still used for sealing many automobile hydraulic brake systems. 12, Polyacrylate (ACM) : There are several polymer products of acrylic acid esters, common trade names being Hycar, Krynac, Thiacril, and Cyanacryl. These materials maintain excellent res istance to the weathering elements of sunlight, oxygen, and ozone, even under severe flexual distortion. These materials also possess
Compounds and Materials 25 high resistance to petroleum fuels and oils, but very poor chemical resistance. Polyacrylate seals are used primarily in automobile engines and transmissions where hot oils are incurred, temperature capability ranging from 0 to 350°F ( -1 8 to +177°C). 13. Polysulfide Rubber (Thiokol): This material is not normally recommended for 0 -r in g seals because it has very poor phy sical characteristics. It is only recommended when the special case of low-temperature flexibility and crack resistance is required in the presence of solvents or weathering elements of ozone, oxy gen, and sunlight. These solvents may include ketones, ethers, and petroleums. 14. Polyurethane (AU,EU): Polyurethane elastomers are compounds of polyethers and diisocyanates. These materials have excellent physical properties of abrasion resistance and tensile strength, which make them outstanding for dynamic applications. They have excellent resistance to weather, ozone, and oxygen, good resistance to hydrocarbon fuels, petroleum oils, and aliphatic solvents, and fair resistance to aromatic hydrocarbons. Acids, ketones, and chlorinated hydrocarbons attack and deteriorate po lyurethane. Because polyurethane is available in castable liquids, injection-moldable pellets, and millable gums, it is a very useful material for unique and specialized sealing problems. 15. Silicone Rubber (Si) : Silicone elastomers are compounded from dimethyl silicone polymers, and thus will deteriorate if used with silicone oils or greases. Various additives have extended the functional temperature range of silicone rubber beyond any other elastomer. Flexibility below — 175°F ( —114°C) and service above 700°F (371°C) for short periods of time have been demonstrated [2, p. A 3 -5 ]. High production costs have normally limited the use of silicone seals to applications requiring extreme temperature resistance. Production molding of silicone seals involves high-temperature secondary cure which results in greater than normal shrinkage. The finished 0 -r in g seal is usually undersized when produced in standard molds. The designer should be aware of this size difference when designing glands for silicone O -rin gs . Silicone elastomers have poor resistance to ketone solvents such as MEK and acetone, and poor resistance to most petroleum fluids. They have very poor physical properties that make them unattractive for dynamic applications. Silicone seals are recommended for extreme temperature use with ozone, oxygen, high-aniline point oils, and chlorinated diphenyls. 16. Epichlorogydrin Rubber (CO,ECO): These chloroaliphatic polymers are oil-resistant materials compounded in two distinct
26 Chap. 1. Basic Configuration forms, homopolymers and copolymers. The functional temperature range of homopolymers is —40°F to +275°F ( —40°C to 135°C), while that of copolymers is —65°F to +275°F ( —54°C to 135°C). Both have excellent resistance to ozone, weather, and hydrocarbon oils and fuels. The corrosive and poor set-resistance properties of epichlorogydrin have limited its use in some seal applications. Figure 2 presents the temperature capabilities of the principal elastomeric materials discussed above. The temperature limits given include a realistic safety margin dependent on the most common compounding of the specific material. The maximum-temperature recommendation for a material is based on reliable functional service for 1000 h r. Time at less than maximum temperature will extend life, while higher temperature will reduce life. The low-temperature service limit is based on the TR-10 value per ASTM D1414 minus a nominal 15°F. This method ensures reliable low-temperature service, provided that sufficient squeeze is designed into the gland geometry. It has been determined that elastomeric materials which can withstand extreme compressive forces are good for low-temperature seal applications. The ex treme compressive forces required are those encountered when the material can be compressed to less than 20% of its original thickness without damage [1, p . 5 . ]. The actual seal environment may extend beyond the temperature limits specified in Fig. 2 for short periods of time. For ex ample, a fluorocarbon seal which is limited to 400°F for prolonged service can tolerate 2000°F for 20 to 40 sec withoiut damage. It is also important to note that no permanent damage is done to any elastomeric material by cryogenic temperatures. A frozen 0 -r in g will regain its service characteristics when returned to normal operating temperatures. IV. ELASTOMERIC SPECIFICATIONS Table 7 presents the commonly referenced military and aerospace specifications for the most popular elastomeric materials. The common name of the material is given together with a brie f descripetion of its featured characteristic and/or use. This table should be useful in categorizing and cross-referencing the prominent military and aerospace specifications. The designer should be careful not to select one of these military or aerospace specifications without being sure that it is broad enough to cover the intended use of the material capabilities, and on the other hand.
Table 7. Elastomeric Specifications: Military Aerospace Material Specification: National Aerospace Standard Common name Specification Description Nitrile (B u n a -N ) MIL-G-1149: Type 1 and 2 Class 5 MIL-R-3533 MIL-P-5315 MIL-P-5510 MIL-P-5516: Class B MIL-R-6855: Class 1, Grade 60; Class 2, Types A and B MIL-R-7362: Types 1 and 2 MIL-G-21569: Class 1 MIL-G-21610: Type 1 MIL-G-23983 MIL-P-25732 MIL-P-83461 AMS3201, AMS3202 AMS3205 AMS3212, AMS3215 AMS3220 AMS3226, AMS3227, AMS3228 AMS3229 AMS7260, AMS7271 AMS 7270 AMS7272 AMS7274 Gasket materials, synthetic ru bber R ubber, synthetic; sheet, strip , and molded O -r in g packing, hydrocarbon fuel resistant Gasket, straight-thread tube fitting boss Gasket and packing, hydraulic, aircraft Synthetic sheets, strips, molded, extruded shapes Synthetic sheet, molded and extruded shapes Gasket cylinder linear seal, synthetic rubber Gasket, heat exchanger, synthetic rubber Gasket, packing material, oil resistant Preformed packing, petroleum fluid resistant Preformed packing, petroleum fluid resistant D ry heat resistance Low temperature resistance Aromatic fuel resistant General purpose; fuel, oil, glycol Hot oil and coolant resistant, low swell Hot oil resistant, low swell Fuel and low temperature resistant Fuel resistant Synthetic lubricant resistant Oil resistant
N co Table 7. (continued) Common name SBR or Buna-S Butyl Neoprene Ethylene Fluorocarbon Specification MIL-G-1149: Type 2, Class 2 AMS3238 AMS7277 MIL-G-1149: Types 1 and 2, Class 1 AMS3208, AMS3209, AMS3240, AMS3241, AMS3242 AMS3222 MIL-G- 22050 MIL-R-83285 NAS1613 MIL-G-23652: Types 1 and 2 MIL-R-25897: Type 1, Classes 1 and 2 MIL-R-83248: Type 1, Classes 1 and 2 Description Gasket material, synthetic rubber Phosphate ester resistant, butyl type Phosphate ester, hydraulic fluid resistant Gasket material, synthetic rubber Weather resistant, chloroprene type Hot oil resistant, high swell Synthetic rubber, nonflammable hydraulic fluid General purpose, ozone resistant Packing, 0-ring, phosphate ester resistant Gasket and packing material, petroleum and phosphate ester fluid resistant Rubber, high temperature fluid resistant Rubber, fluorocarbon, high temperature fluid and compression set resistant
N 1.0 Fl uorosilicone Silicone MIL-R-83485: Type 1 AMS7276 AMS7278, AMS7279 AMS7280 MIL-R-25988: Type 1, Class1 AMS3326 MIL-R-5847 (superseded by ZZ-R-7658) MIL-G-21569: Class 2 AMS3301, AMS3302, AMS3303, AMS3304, AMS3305, AMS3307 AMS3335, AMS3337 AMS3345, AMS3349 AMS3357 AMS7267 Rubber, fluorocarbon, low temperature performance High temperature fluid resistant, very low compression set fluorocarbon High temperature fluid resistant fluorocarbon Low compression set fluorocarbon Rubber, fluorosilicone, oil, and fuel resistant Silicone, fuel, and oil resistant Rubber silicone Gasket cylinder linear seal, synthetic rubber Silicone, general purpose Silicone, extreme low temperature resistant Silicone rubber Silicone rubber, lubricating oil, compression set resistant Silicone, heat resistant, low compression set
30 Chap. 1. Basic Configuration that it is not so broad that it allows variations in material compound that may not be acceptable. V. MANUFACTURERS AND DISTRIBUTORS Table 8 lists 49 manufacturers and/or distributors of elastomeric ring seals according to location within the United States. This list is included to aid the designer in obtained additional information directly from a local manufacturer or distributor. This is not an all-inclusive list. Table 8. Elastomeric Ring Seals: Manufacturers and Distributors^ * Alabama Sepco C o rp ., Birmingham Tenn-Val In c ., Decatur California Satori Seal C o rp ., Alhambra Gasket Specialties In c ., Brisbane *Kyowa Metriseal Co ., Brisbane General Connectors C o rp ., Burbank Standard Polymer, In c ., Camarillo A rv an , In c ., El Monte Bozung, J. A . Co ., El Monte Allmetal Screw Products Company, In c ., El Segundo Tetrafluor, Inc. , El Segundo Bobber Products, In c ., Fullerton Aero-Stat Co. , Gardena Porter Seal Mfg. , Glendale *Advantec, Inglewood Service Rubber & Gasket Co ., La Puente Holz Rubber Co. , Lodi Fluorocarbon Co ., Los Alamitos Airsco, Los Angeles *Burly Seal Products Co. , Los Angeles Calnevar Sea Co ., GSC C o rp ., Los Angeles Local C o . , Los Angeles Majestic Fasteners Co, , Los Angeles Material Fabricators, In c ., Los Angeles 0 -R in g s In c ., Los Angeles Plastic and Rubber Engineering, In c . , Los Angeles Alatec Products, North Hollywood
Manufacturers and D istributors 31 Table 8. (continued) *Parco, Ontario Dodge-Wasmund Mfg. , In c . , Pico Rivera Diesel Energy Products, In c ., Pleasanton Vibration Isolation Products, In c ., San Fernando American Asbestos Co ., San Francisco Western Rubber & Supply, San Francisco Burke Industries, San Jose Boyd Industries, San Leandro Bal-Seal Engineering C o . , Santa Ana International Seal Company, In c ., Santa Ana Allmetal Screw Products Company, In c ., Santa Clara Qualified A ir Components, Santa Fe Springs Sealtec Inc. , Santa Fe Springs Allied A irparts & Supply Company, Inc. , South El Monte ♦Houston Rubber Company, In c ., Sylmar *Da/Pro Rubber, Inc ., Van Nuys Connecticut Agi Rubber Company, Bridgeport Enflow Corp. , Bristol ♦Connecticut Rubber Molding Corporation, Danielson Magnatec, East Ganby Parts In c ., East Hartford American Seal & Engineering Company, In c ., Hamden Age In c ., Meriden Auburn Mfg. Company, Middletown Advance Products Company, In c ., North Haven Orcomatic Inc. , Norwich Florida Hoose, Robert E . , In c ., Miami Veri-Tech Inc. , Pompano Beach Century Fasteners Corp ., Tampa Allmetal Screw Products Company, In c ., Winter Park Georgia AAA Seals & Packing Company, In c ., Atlanta Allmetal Screws Products Company, In c ., Atlanta Dixie Bearings, In c ., Atlanta Dixie Packing Company, Atlanta General Rubber & Plastics Corp . , Atlanta