Boker's Stamping Brochure

STAMPINGSS P E C I A L I S T S S I N C E 1 9 1 9

YOUR SOURCE FOR QUALITY STAMPINGS

Quality Stampings Made to Order

Draws up to 3” deep and
8” in diameter

Boker’s has specialized in producing high quality metal stampings for over nine decades.
Our precision manufacturing covers a complete range of sizes up to 12“ x 12“ (flat) with
thicknesses from .005“ to .134“ and draws of up to 3“ deep and 8“ in diameter.

Draws, Forming, Blanking & Piercing

At Boker’s, we utilize the latest stamping technologies and manufacturing concepts
to continually provide you with stampings of the highest quality. This diligent
effort to achieve and retain the highest quality possible in our metal stamping
processes goes back to 1919.
Our process begins with our in-house tool department, where wire EDM-
produced tooling provides the dimensional tolerances you require. Complete
Statistical Process Control (S.P.C.) is available upon request to further assure
accuracy throughout the manufacturing process. Our “Dock-to-Stock” capability
saves you inspection time and is another example of our commitment to
customer service. Boker’s can also meet your delivery requirements with flexible
Just-In-Time (J.I.T.) programs.

2 888-STAMPINGS (888-782-6746)

Owner Operated Since 1919

Boker’s can produce your most Flat blanking and piercing
complex metal forming needs in up to 12” by 12”
thicknesses from .005” to .134”

Over 2,000 Materials AS9100C/ISO 9001:2008
Certified
To expedite your order and shorten
delivery time, Boker’s has immediate Boker’s takes their manufacturing
access to over 2,000 commonly practices very seriously and maintains
specified and hard-to-find materials AS9100C/ISO 9001:2008 certified
including low carbon, cold rolled strip status. This means when you purchase
and sheet steel; SAE 1050, 1075, your products from Boker’s you will
and 1095 spring steel, blue and have the confidence our processes
black temper spring steel, low alloy steel sheets, brass, copper, nickel are efficient and effective.
silver, beryllium copper, phosphor bronze, stainless steel, aluminum; and
several non-metallic materials such as acetal, PTFE, polyester, nylon, fiber, Quality Assurance and Certification
polyethylene, and various phenolics. Plus varieties of wrought cobalt,
iron and nickel-base superalloys for demanding, high-performance ✔ C of C ✔ S.P.C. ✔ R EACH
applications. Certificates of Compliance or chemical/physical analysis ✔ ITAR
are available upon request. Whatever your requirements, if it can be ✔ PPAP ✔ F.A.I.
stamped, Boker’s can turn it into the part you need.
✔ DFARS ✔ AS9102
Secondary Operations
✔ RoHS ✔ Dock-To-Stock
Boker’s provides the secondary
operations you require including Boker’s Environmental Compliance Statement
deburring, tapping, reaming, counter-
boring, and spotfacing to name a few. Boker’s, Inc. is committed to responsible business practices that
Boker’s also has approved vendors for portray our dedication to our employees, customers and country.
heat treating, grinding and plating. Boker’s sources conflict-free material and services, in addition to
See page 4 for a full list of equipment materials that do not contain regulated or hazardous substances, from
and capabilities. validated suppliers. These include, but are not limited to, tin, tantalum,
tungsten and gold. It is important that our suppliers adhere to the laws
put in place to ensure our values and commitments are reflected in our
customer offering.

bokers.com [email protected] 3

Equipment and Capabilities List

Housed in over 90,000 square feet of buildings, the equipment listed below, as well as all tooling, are protected by a central
station security and fire system.

Tool & Engineering Department Heat Treating Department Material Capabilities

• CAD CAM Drawing System • E lectric High Temperature • Material Thickness: .005” to .134”
• Kitamura Vertical Machine Center Hardening Furnaces • Blank Size: 12” x 12” maximum (flat)
• Mori Seiki Vertical Machine Center (20” x 40”) • Draws: 8” diameter, 3” deep maximum
• Mori Seiki High Precision C.N.C. Lathes • E lectric Tempering Furnaces
• Digital Optical Comparator (all furnaces calibrated) Shipping Department
• (2) Clausing Surface Grinders
• Matsui Precision Grinder Raw Stock & Shear Department • Toledo Electronic Scales & Printer
• (3) Charmilles Wire E.D.M.s (14” x 21” x 8”) • P recision Electronic Scales & Printers
• Charmilles E.D.M. Drill • 2-10’ Shears (.25” thick maximum) • Automated Protective Packaging Bagger
• Okamoto Precision Grinder • Stanat Model Rolling Mill • P olychem Automatic Plastic Strapping System
• Cooper Weymouth Roller Levelers • H ercules Ergo Container Handling System
Washer Department • Coil Set Straightener • W ulftec Pallet Wrapper
• Wilder Coil Slitter
• 18 Punch Presses (10 to 75 tons) • Computer Inventory & Control System Inspection Department
• Digital Servo Feeders
• Electric Coil Reels (1,200 lb. capacity) Secondary Operations Department • Numerex Coordinate Measuring Machine
• Coil Straighteners • Digital Optical Comparator
• Tonnage Monitors • Trimming Lathes • Digital Buehler Hardness Tester
• Production Milling Machines • Digital Profilometer
• Pneumatic Presses • Ceramic Gauge Block Sets
• Tapping Machines • Plug Gauge Sets
• 6 Spindle Machine Centers (multiple head • Height Gauges
• Thread Gauges
drilling, tapping, and reaming) • S tatistical Process &
• 4 Straight-liners up to 18”
• Parts Washing System Capability Studies Available
• Climate Controlled
Stamping Department Cleaning & Deburring Department
CREDIT CARDS ACCEPTED
• 46 Punch Presses (10 to 180 tons) • Agitated Chemical Washing System
• 2 High Speed Minster Progressive Die Presses • Rotary Deburring Machines CALL TOLL FREE:
• Vibratory Deburring Machines
(60 to 150 tons) • Centrifugal Tumblers 888-782-6746
• Digital Servo Feeders • Heated Centrifugal Dryers
• Electric Coil Reels (6,000 lb. capacity) • Lewis Ultrasonic Cleaner 3104 Snelling Avenue
• 48” Press Brake • High Energy Deburring Machines Minneapolis, MN 55406-1937
• Optical Part Detection Systems • Mass Finishing Machines (612) 729-9365 • Fax (800) 321-3462
• Tonnage Monitors • Custom Parts Dryer Call 888-STAMPINGS
bokers.com • [email protected]
4

Gauge Decimal Equivalents

For accuracy, specify by decimal - not by gauge

GAUGE Non-Ferrous Steel Sheets (Uncoated) Strip & Tubing
NUMBER
Brown & Sharp Based on .2833 lb./cu. in density Birmingham or Stubs
000000
00000 Lbs./Sq. ft. Gauge Lbs./Sq. ft. Gauge Lbs./Sq. ft. Gauge Lbs./Sq. ft.
0000 1100,6061 Decimal Alloy 260 Decimal Steel Strip Decimal Steel Strip
Aluminum
000 .5800 Brass .2391 9.754 .500 20.40
00 2.286 .5165 .2242 9.146 .454 18.52
0 2.036 .4600 7.185 .2092 8.534 .425 17.34
1 1.813 .4096 6.400 .1943 7.926 .380 15.50
2 1.614 .3648 5.699 .1793 7.315 .340 13.87
3 1.438 .3249 5.074 .1644 6.707 .300 12.24
4 1.280 .2893 4.520 .1495 6.099 .284 11.59
5 1.140 .2576 4.023 .1345 5.487 .259 10.57
6 1.016 .2294 3.584 .1196 4.879 .238 9.710
7 .2043 3.193 .1046 4.267 .220 8.975
8 .905 .1819 2.843 .0897 3.659 .203 8.281
9 .806 .1620 2.532 .0747 3.047 .180 7.343
10 .717 .1443 2.253 .0673 2.746 .165 6.731
11 .639 .1285 2.009 .0598 2.440 .148 6.038
12 .569 .1144 1.787 .0538 2.195 .134 5.467
13 .507 .1019 1.592 .0478 1.950 .120 4.895
14 .452 .0907 1.419 .0418 1.705 .109 4.447
15 .402 .0808 1.264 .0359 1.465 .095 3.876
16 .357 .0720 1.122 .0329 1.342 .083 3.386
17 .319 .0641 1.002 .0299 1.220 .072 2.937
18 .284 .0571 .0269 1.097 .065 2.652
19 .253 .0508 .892 .0239 .058 2.366
20 .224 .0453 .794 .0209 .975 .049 1.999
21 .200 .0403 .705 .0179 .853 .042 1.713
22 .178 .0359 .630 .0164 .730 .035 1.428
23 .160 .0320 .559 .0149 .669 .032 1.305
24 .141 .0285 .501 .0135 .608 .028 1.142
25 .126 .0253 .444 .0120 .551 .025 1.020
26 .113 .0226 .395 .0105 .490 .022
27 .100 .0201 .355 .0097 .428 .020 .898
28 .089 .0179 .315 .0090 .396 .018 .816
29 .0159 .279 .0082 .367 .016 .734
30 .0142 .248 .0075 .335 .014 .653
31 .0126 .222 .0067 .306 .013 .571
32 .0113 .200 .0064 .273 .012 .530
33 .0100 .177 .0060 .261 .010 .490
34 .0089 .245 .009 .408
35 .0080 .008 .367
36 .0071 .007 .326
37 .0063 .005 .286
38 .0056 .004 .204
.0050 .163
.0045
.0040

888-STAMPINGS (888-782-6746) • FAX 800-321-3462 5

Glossary of Terms

Bar Coding - Machine readable alphabetic and/or numeric Flange - Formed projection or rim of a part generally used for Pull Down - Area of material next to the penetrating edge of a
information used for identification of packaged parts. stiffness or assembly. piercing punch, or die edge of the blanking station, where the material
Barrel Tumbling - Process in which parts to be deburred are Flat or Matte - Coating surface which displays no gloss when yields i.e., flows in the direction of the applied force creating a
put together with abrasive material into a barrel and rotated for observed at any angle; a perfectly diffused reflecting surface. rounded edge. Also known as “roll-over”.
prolonged periods for the purpose of burr removal. Formed Tab - Small flange bent at an angle from the body of a Punch Press - Machine supplying compression force for
Bend Radius - Inside radius. metal workpiece. reshaping materials.
Bend Relief - Clearance notch at an end of flange to allow bending Forming - Operation converting a flat sheet metal workpiece into Punch Side - Opposite side from burr side for pierced features;
without distorting or tearing adjacent material. a three dimensional part. See also “Bending” and “Drawing”. side on which the punch enters the material.
Bending - Generally applied to forming. Creation of a formed Gauge - (1) Instrument for measuring, testing, or registering. Quick Change Inserts - Tool sections or parts which may be
feature by angular displacement of a sheet metal workpiece. See also (2) Numeric scale for metal thickness. changed without removing the entire tool from the press.
“Drawing” and “Forming.” Go/No-Go Gauge - Measuring device with two registration Rerolling - Final cold rolling operation, usually done to achieve specific
Blank - (1) Sheet metal stock from which a product is to be made. elements which determine if a feature to be measured is between two thickness control and improved finish.
(2) Workpiece resulting from blanking operation. established limits. Roundness - Extent to which a feature is circular.
Blanking - Die cutting of the outside shape of a part. Gouge - Surface imperfection, deeper than a scratch, often with Run Out Flange - Feature on a formed part which is designated
Bow Distortion - Out of flatness condition in sheet material raised edges. by the designer to absorb the tolerance accumulations created by
commonly known as “Oil Canning” in which, with the edges of the Grain Direction - (1) Crystalline orientation of material in the multiple forming operations.
sheet restrained, the center of the sheet can be popped back and direction of mill rolling. (2) Orientation of a surface finish generated Scrap - Leftover, unused material relegated to recycling.
forth but cannot be flattened without specialized equipment. by abrasive method. Shear-to-Feature - Shearing of an edge of stock to an exact
Breakout - Fractured portion of the cross section of a cut edge of Grinding - Process of removing material by abrasion. dimension from an already existing feature.
stock. A condition naturally occurring during shearing, blanking, Half Shearing - Partial penetration piercing, creating a locating Shearing - Cutting force applied perpendicular to material causing
punching and other cutting operations. button with a height of about 1/2 material thickness. the material to yield and break.
Burn Mark - Heat discoloration created in the contact area of a Hard Tooling - Tooling made for a specific part. Also called Shut Height - Clearance in a press between ram and bed with ram
welding electrode. “dedicated tooling”. down and adjustment up.
Burr - Raised, sharp edge inherent in cutting operations such as Hem (Dutch Bend) - Edge of material doubled over onto itself for Slide Forming - A high-volume stamping process in which a machine
shearing, blanking, punching and drilling. the purpose of safe handling or to increase edge stiffness. with multiple slides sequentially performs various operations (i.e. -
Burr Direction - Side of the stock on which burrs appear. Hold-Down Marks - Slight indentations or scuff marks on one side blanking, piercing, forming, etc.).
Burr-Free - Edge without sharp protrusions. of the stock which can result from the pressure of hold-down devices Slug - Scrap from a piercing operation.
Burr Height - Height to which burr is raised beyond the surface during shearing operations. Slug Marks - Surface defects caused by scrap being indented into
of the material. Hole Rollover - Rounding of the top edge of a pierced feature the metal surface.
Burr Rollover - Condition of burr displacement resulting from caused by the ductility of the metal, which flows in the direction of Spot Face - Circular flat surface as a bearing area for hardware.
mechanical deburring operation. the applied force. Squareness - Measure of perpendicularity of adjacent edges or
Chain Dimensioning - Drafting practice which dimensions Hole-to-Form - Distance from the edge of a hole to the inside surfaces.
repetitive features from each other rather than a common datum. edge of a formed feature. Spring Back - Partial rebounding of formed material caused by
Clamp Marks - Slight indentations at the edge of one side of stock Hole-to-Hole - Dimension between the centers of holes. its elasticity.
caused by pressure from turret press holding devices. Hydraulic Press - Machine which exerts working pressure by Staking - Method of fastening using displaced material for retention.
Coining - Compressive metal flowing action. hydraulic means. Stiffening Rib - Embossed feature in a sheet metal workpiece which
Compound Die - Tool used to pierce, form and blank a part at the Inspection Criteria - Characteristics by which the part will be is added to make the part more rigid.
same time, with one stroke of the press. evaluated both dimensionally and cosmetically. Stretcher Leveled - A flattening process in which a material is
Concentricity - Dimensional relationship of 2 or more items sharing Lead Time - Time required to manufacture a product from order stretched to achieve a desired flatness tolerance.
a common center line. placement until availability. Stripper - Mechanical hold-down device applied to the workpiece
Corner - Three surfaces meeting at one point. Master Die - Universal tool receptacle for holding changeable during the punching process.
Corner Radius - Outside radius. tool systems. Stripper Marks - Imprints on one side of the stock around pierced
Counterboring - Machining or coining operation to generate a Metal Thinning - Thickness reduction during any forming operation. holes, caused by punch strippers.
cylindrical flat-bottomed hole. Model - Pre-production sample made with limited emphasis on Stripping - Process of disengaging tooling from the workpiece.
Countersinking - Machining or coining operation to generate a tolerance to test a design concept. See also “Prototype”. Strips - Sheet material, sheared into narrow long pieces.
conical angle on a hole. Nesting - (1) Grouping of identical or different parts in multiples Stroke - RAM travel from top dead center (TDC) to bottom dead
Cumulative Tolerance - Progressive accumulation of tolerances within a workpiece to conserve material. (2) In packaging, stacking center (BDC).
resulting from multiple operations or assembly of multiple parts. of parts whose shape permits one to fit inside another. Tapping - Operation to create internal threads by either cutting
Datums - Theoretically exact planes, lines or points from which other Nibble Marks - Slight irregularities at the edge of the stock surface or forming.
features are located on design drawings. after progressive punching (“nibbling”) operations in a turret press. Tolerance - Permissible variation from a specification for any
Deburr - To remove the sharp, knife-like edge from parts. Notching - Operation in which the punch removes material from the characteristic of the product.
Dedicated Tooling - Commonly referred to as “hard tooling”— edge or corner of a strip or blank. Transfer Die - Variation of a progressive die where the part is
tooling made to produce a specific part. Penetration - (1) Depth of a cutting operation before breakout transferred from station to station by a mechanical system. Mainly
Die - Tool with a void or cavity which is precisely fitted to a “Punch” occurs. (2) In welding, the depth of material through which used where the part has to be free from the strip to allow operations
used to shear or form sheet metal parts. fusion occurs. to be performed in a free state.
Die Clearance - Amount of space between the punch and die opening. Perpendicularity - Dimensional relationship of a part or datum Turret Press - Automatic punch press indexing the material and
Die Marks - Scratches, scrub marks, indentations, galling or located at right angles (90°) to a given feature. selecting the intended tool out of the rotary tool holding device
burnishing of sheet metal workpieces by tooling. Piercing - Punching of openings such as holes and slots in material. (turret) totally by computer control for piercing, blanking and
Drawing - (1) Engineering document depicting a part or assembly. Pinch Trim - Trimming excess material from a drawn part at the forming workpieces as programmed.
(2) In metalforming, the stretching or compressing of a sheet metal bottom of the stroke. Leaves drawn shell without an inside burr, but V Die - Tool used in conjunction with a V punch.
part into a die by a punch to create a 3-dimensional part. See also with an outside burr and a thinned edge. V Punch - Vee shaped tool used for angle forming.
“Bending”. Progressive Tool - Die using multiple stations or operations to Vibratory Finishing - Burr removal process in which an appropriate
Ductility - Ability of a material to be bent or otherwise formed produce a variety of options. Can incorporate piercing, forming, number of parts, depending on part size and abrasive material, is
without fracture. extruding and drawing, and is usually applied to high quantity accelerated and decelerated by mechanical means
Edge Bulge - Condition resulting from any forming, piercing, production runs. inside of a drum-like enclosure.
hardware insertion or spot welding operation too close to an edge. Prototype - First part of a design which is made to test tolerance Webs - Material between two openings or edges.
Edge-to-Feature - A dimension between the edge of the part and capability, tooling concepts and manufacturability. Wipe Die - Forming tool using two opposing edges, separated by
a feature. one material thickness, moving past each other to form material.
Feature-to-Feature - Dimension between two features on a part.
Fixture - Tooling designed to locate and hold components in position.

Terms provided courtesy of the Precision Metalforming Association.

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Base Elements Index

ELEMENT SYMBOL ELEMENT SYMBOL ELEMENT SYMBOL
Actinium Ac Gold (Aurum) Au Rhodium Rh
Aluminum Al Hafnium Hf Rubidium Rb
Antimony (Stibium) Sb Holmium Ho Ruthenium Ru
Argentum (Silver) Ag Hydrargyrum (Mercury) Hg Samarium Sm
Arsenic As Indium In Scandium Sc
Aurum (Gold) Au Iridium Ir Selenium Se
Barium Ba Iron, Cast (Ferrum, Cast) Fe Silicon Si
Beryllium (Glucinum) Be Kalium (Potassium) K Silver (Argentum) Ag
Bismuth Bi Lanthanum La Sodium (Natrium) Na
Boron B Lead (Plumbum) Pb Stannum (Tin) Sn
Cadmium Cd Lithium Li Stibium (Antimony) Sb
Calcium Ca Lutetium (Cassiopeium) Lu Strontium Sr
Cassiopeium (Lutetium) Lu Magnesium Mg Tantalum Ta
Cerium Ce Manganese Mn Tellurium Te
Cesium Cs Mercury (Hydrargyrum) Hg Terbium Tb
Chromium Cr Molybdenum Mo Thallium Tl
Cobalt Co Neodymium Nd Thorium Th
Columbium (Niobium) Nb Nickel Ni Thulium Tm
Copper (Cuprum) Cu Niobium (Columbium) Nb Tin (Stannum) Sn
Cuprum (Copper) Cu Osmium Os Titanium Ti
Dysprosium Dy Palladium Pd Tungsten (Wolfram) W
Erbium Er Platinum Pt Uranium U
Europium Eu Plumbum (Lead) Pb Vanadium V
Ferrum, Cast (Iron, Cast) Fe Plutonium Pu Wolfram (Tungsten) W
Gadolinium Gd Potassium (Kalium) K Ytterbium Yb
Gallium Ga Praesodymium Pr Yttrium Y
Germanium Ge Promethium Pm Zinc Zn
Glucinum (Beryllium) Be Rhenium Re Zirconium Zr

Boker’s Precision Washers & Spacers

Boker’s also offers thousands of flat non-standard
washer sizes with no tool charges. Available outside
diameters are 0.080” to 5.140”, with a wide variety
of inside diameters and thicknesses. Combined with
over 2,000 material variations, this creates millions of
possibilities. Metric sizes are also available. A complete
listing of washer sizes is available in two formats: a
hard copy catalog, or on the Internet at bokers.com.
Boker’s electronic media allows you to quickly sort and
access the exact sizes you need. Request your catalog,
or visit our website today!

CREDIT CARDS ACCEPTED 3104 Snelling Avenue, Minneapolis, MN 55406-1937
Toll Free: 888-782-6746 • Fax: 800-321-3462
bokers.com [email protected] Phone: (612) 729-9365 • Fax: (612) 729-8910
bokers.com • [email protected]

7

BOKER’S Delivers Worldwide

3104 Snelling Avenue • Minneapolis, MN 55406-1937
Phone (612) 729-9365 • Fax (612) 729-8910

Call 888 STAMPINGS (888-782-6746) • Toll Free Fax 800-321-3462
bokers.com • [email protected]