HARDLOCK SET SCREW

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ENGINEER

TECHNICAL DATA

Self-Locking Nut

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ENGINEER

The globally recognRized HARDLOCK Set Screw (HLS)

The globally recognized HARDLOCK Bearing Nut (HLB)

HARDLOCK SET SCREWHARDLOCK BEARING NUT

˛ ADVANTAGES Mark of quality assurance

˙ Self-locking effect remains even under severe vibration.
˙ Completely locked even if there is no clamp load.
˙ All metal with little galling enables repeated reuse.
˙ Can be installed with commercially available tools.

˛ REMARKABLE LOCKING FORCE RELIEVING COMPLICATED MAINTENANCE WORK

2 “The Wedge Principle” with the combination of 1 Convex Nut having
a truncated protrusion arranged off-center and 2 Concave Nut having
a concentric conical recess, creates a strong perpendicular load that will

1 be applied to the shaft to prevent loosening.

Due to the strong locking force created by the wedge principle, no matter
how severe vibrations and impacts generated by high speed rotation the
HLB is exposed to, it will remain in a stable locked condition.

˛ INSTALLATION PROCEDURE 3 45

12

1 Use a hook wrench to tighten the Convex Nut to the appropriate torque required for the application.
2 Install the Concave Nut by hand until it no longer turns, then make sure that the space between the

Convex Nut and Concave Nut is more than 1 thread pitch.

3 Use a torque wrench to tighten the Concave Nut to the recommended torque.
If a torque wrench is not available, use a hook wrench and tighten more than 360 degrees.

4 Even with or without a gap after tightening to the recommended torque, HLB will produce a sufficient
locking effect.

5 The Convex Nut and Concave Nut can be installed in opposite order with no reduction in the self-
locking effect. Nevertheless, it is recommended to tighten Convex Nut first if a heavier load is applied.

˛ STANDARD MATERIALS AND SURFACE TREATMENTS

Materials Surface treatment
Low Carbon Steel (JIS SS400 equivalent) Manganese Phosphate
Medium Carbon Steel (JIS S45C) Manganese Phosphate
Stainless Steel (JIS SUS304 equivalent) Unplated

*Please contact us for other materials and surface treatments.

˛ DIMENSION AND TIGHTENING TORQUE TABLE

Nominal Pitch Convex nut Concave nut Common to Overall Bottom Unit Tightening torque(N.m)
Size Convex & Concave height surface Weight *Common to
squarness
AN D B1M D1 D2 B (l) (Max) (g) material/strength
Basis Tolerance Basis Tolerance Tolerance approx. approx.
dP b Basis Tolerance Basic Basis S g Convex Concave nut
(approx.) nut (Recommended)

AN00 M10 0.75 18 0 6 0 3.5 18 0 17 6 0 3 14 9.5 19 * 16
AN01 M12 1 -0.5 -0.5 -0.5 -0.5
AN02 M15 1
AN03 M17 1 22 0 6 0 3.5 22 0 17 6 0 3 18 9.5 17 * 16
AN04 M20 1 -0.5 -0.5 -0.5 -0.5
AN05 M25 1.5
AN06 M30 1.5 25 0 7 0 4.5 25 0 21 7 0 4 21 11.5 23 * 28
AN07 M35 1.5 -0.5 -0.5 -0.5 -0.5
AN08 M40 1.5
AN09 M45 1.5 28 0 7 0 4.5 28 0 24 7 0 4 24 11.5 29 * 37
AN10 M50 1.5 -0.5 -0.5 -0.5 -0.5
AN11 M55 2
AN12 M60 2 32 0 8 0 5.5 32 0 26 8 0 4 28 13.5 43 * 55
AN13 M65 2 -0.5 -0.5 -0.5 -0.5
AN14 M70 2
AN15 M75 2 38 0 10 0 6 38 0 32 10 0 5 34 16 0.05 72 * 80
AN16 M80 2 -0.5 -0.5 -0.5 -0.5
AN17 M85 2
AN18 M90 2 45 0 10 0 6 45 0 38 10 0 5 41 103 * 115
AN19 M95 2 -0.5 -0.5 -0.5 -0.5
AN20 M100 2
52 0 11 0 7 52 0 44 11 0 5 48 18 150 * 130
-0.5 -0.5 -0.5 -0.5

58 0 9 0 5 58 0 50 12 0 6 53 17 170 * 155
-0.5 -0.5 -0.5 -0.5

65 0 10 0 6 65 0 56 13 0 6 60 19 240 * 170
-0.5 -0.5 -0.5 -0.5

70 0 11 0 7 70 0 61 14 0 6 65 21 285 * 200
-0.5 -0.5 -0.5 -0.5

75 0 11 0 6 75 0 67 15 0 7 69 21 310 * 210
-0.5 -0.5 -0.5 -0.5

80 0 11 0 6 80 0 73 15 0 7 74 21 340 * 240
-0.5 -0.5 -0.5 -0.5

85 0 12 0 7 85 0 79 12 0 7 79 19 330 * 255
-0.5 -0.5 -0.5 -0.5

92 0 12 0 7 92 0 85 12 0 8 85 19 390 * 270
-0.5 -0.5 -0.5 -0.5

98 0 13 0 8 98 0 90 13 0 8 91 21 480 * 300
-0.5 -0.5 -0.5 -0.5 8 310
0.07
0 0 0 0
105 -0.5 15 -0.5 10 105 -0.5 95 15 -0.5 98 25 660 *

110 0 16 0 11 110 0 102 16 0 8 103 27 760 * 340
-0.5 -0.5 -0.5 -0.5

120 0 16 0 11 120 0 108 16 0 10 112 27 940 * 350
-0.5 -0.5 -0.5 -0.5

125 0 17 0 12 125 0 113 17 0 10 117 29 1,090 * 380
-0.5 -0.5 -0.5 -0.5

130 0 18 0 13 130 0 120 18 0 10 122 31 1,230 * 390
-0.5 -0.5 -0.5 -0.5

HLB of M105 - M200 are also available . Refer to our Website https://www.hardlock.co.jp/en/.

* Convex Nut (Clamp Nut) shall be tightened to the torque appropriate for the application.

* External dimensions: JIS B1554(2016) / ISO2982

* Threads tolerance: Class 6H JIS B0209(2001) / ISO965

* In case of tightening Concave Nut first, the recommended tightening torque of Concave Nut in the above
table is applied to Convex Nut (acts as Lock Nut).

HARDLOCHKASREDT LSOCCRKEWSET SCREWThe globally recognRizeTdheHgAloRbDaLllyOrCeKcogSneitzeSdcHreAwRD(LHOLCSK)Set Screw (HLS)

HLS-A Standard Normal type HLS-B Standard Hollow type

HLS-C Pin Normal type HLS-D Pin Hollow type

˛ ADVANTAGES

˙ The self-locking effect remains even in the most severe environments.
˙ All metal with little abrasion enables repeated reuse.
˙ Simple and fast installation.
˙ Significant cost reduction.

˛ MAINTENANCE-FREE WITH EXTRAORDINARY LOCKING PERFORMANCE

The HARDLOCK Set Screw (HLS) is a revolutionary self-locking set
screw (Hexagon socket head set screw) which applies the “Wedge
2 2 Principle” and delivers superior self-locking effect like the other
HARDLOCK products. By combining the concave set screw 1 with its
concentric conical recess and the convex set screw 2 designed with
1 1 an eccentric protrusion, due to the wedge principle, they will lock
themselves in the direction perpendicular to the axis.

to lock shaft collars

to fix a core pin for die
casting/molding dies

˛ INSTALLATION PROCEDURE 3 4

12

1 Tighten the concave set screw first.
2 Use a general tightening tool (L-wrench or the like).
3 Tighten the convex (lock) screw by the specified torque or by 1 turn (360 degrees) after prevailing torque is

generated (When the protrusion and recess come into contact.).

4 Installation Complete.

˛ DIMENSION AND TIGHTENING TORQUE TABLE

STANDARD - NORMAL TYPE 1
HLS-A (aka HLS or HLS-S)

Size Materials Plating

M8 - M20 (Coarse) Property Class 45H Black Oxide
M8 - M20 (Fine) Surface Hardness 45 - 53HRC Black Oxide
M22 - M36 Property Class 33H
Surface Hardness 33 - 44HRC Download CAD Files

Nominal Pitch Set screw (1) Lock screw (2) Overall Hexagon socket Unit Reference Proof
size (Concave) (Convex) height Common to (1) (2) weight tightening torque
(Approx.) torque (Nm) (Nm)
H Tolerance t1 B Tolerance (g) *Common to
S, S1 Coarse Fine 10 ±0.29 Ӎ2.5 H1 Tolerance t2 l 4 +0.02 / +0.10 4 (1) & (2) 16
12 ±0.35 Ӎ3 5 +0.02 / +0.14 8 30
M8 1.25 - 16 ±0.35 Ӎ5 10 ±0.29 Ӎ5 17.5 6 +0.02 / +0.14 16 9～10 52
16 ±0.35 Ӎ4 6 +0.02 / +0.14 22 52
M10 1.5 - 20 ±0.42 Ӎ6 12 ±0.35 Ӎ6 21 8 +0.03 / +0.18 37 17～20 120
20 ±0.42 Ӎ6 8 +0.03 / +0.18 47 120
M12 1.75 1.5 20 ±0.42 Ӎ7 16 ±0.35 Ӎ8 29 10 +0.03 / +0.18 52 29～34 220
25 ±0.42 Ӎ10 12 +0.03 / +0.18 79 370
M14 2 1.5 25 ±0.42 Ӎ9 16 ±0.35 Ӎ8 28 12 +0.05 / +0.23 95 29～34 370
30 ±0.42 Ӎ9 17 +0.05 / +0.23 161 980
M16 2 1.5 35 ±0.5 Ӎ8 20 ±0.42 Ӎ10 36 17 +0.05 / +0.23 368 66～78 980

M18 2.5 1.5 20 ±0.42 Ӎ10 36 66～78

M20 2.5 1.5 20 ±0.42 Ӎ12 35 121～143

M22 2.5 1.5 25 ±0.42 Ӎ15 45 204～241

M24 3 1.5 25 ±0.42 Ӎ15 44 204～241

M30 3.5 1.5 30 ±0.42 Ӎ15 54 539～637

M36 4 1.5 35 ±0.5 Ӎ15 63 539～637

1

STANDARD - HOLLOW TYPE
HLS-B (aka HLS-T or HLS-H)

Size Materials Plating

M12 - M36 Property Class 33H Black Oxide
Surface Hardness 33 - 44HRC
Download CAD Files

Nominal Pitch Set screw (1) Lock screw (2) Overall Hexagon socket Hole dia. Reference
size (Concave) (Convex) height Common to (1) (2) Unit tightening Proof
(Approx.) weight torque (Nm) torque
H Tolerance t1 B Tolerance
S, S1 Coarse Fine 16 ±0.35 Ӎ2 H1 Tolerance t2 l A, A1 Tolerance (g) *Common to (Nm)
M12 1.75 16 ±0.35 Ӎ2
M14 2 1.5 20 ±0.42 Ӎ4 (1) & (2)
M16 2 1.5 20 ±0.42 Ӎ5
M20 2.5 1.5 25 ±0.42 Ӎ6 16 ±0.35 Ӎ5 29 6 +0.02 / +0.14 6 ±0.2 13 29 ～34 52
M24 3 1.5 30 ±0.42 Ӎ9
M30 3.5 1.5 35 ±0.5 Ӎ8 16 ±0.35 Ӎ6 28 6 +0.02 / +0.14 6 ±0.2 18 29～34 52
M36 4 1.5
20 ±0.42 Ӎ8 36 8 +0.03 / +0.18 8 ±0.2 29 66～78 120

20 ±0.42 Ӎ10 35 10 +0.03 / +0.18 10 ±0.2 44 121～143 220

25 ±0.42 Ӎ12 44 12 +0.05 / +0.23 12 ±0.2 81 204～241 370

30 ±0.42 Ӎ15 54 17 +0.05 / +0.23 17 ±0.2 134 539～637 980

35 ±0.5 Ӎ15 63 17 +0.05 / +0.23 17 ±0.2 293 539～637 980

• External dimensions: JIS B1177(2007) / ISO4026
• Threads tolerance: Class 6g JIS B0209(2001) / ISO965
• Reference tightening torque is calculated by multiplying 0.6 plus or minus 5% of the proof torque of hexagonal wrenches

stipulated in JIS B4648 (ISO2936).

˛ DIMENSION AND TIGHTENING TORQUE TABLE

PIN - NORMAL TYPE
HLS-C (aka HLS-P)

Size Materials Plating

M12 - M36 Property Class 33H Black
Surface Hardness 33 - 44HRC Oxide
Download CAD Files

Hexagonal socket Reference
*Common to
Size Pitch L Set Screw (1) Lock Screw (2) Thread (1) &(2) Pin dia. Unit tightening Proof
(Concave) (Convex) length weight torque torque
(Nm)
H Tolerance t1 H1 Tolerance t2 l *Common to
S, S1 Coarse Fine B Tolerance A, A1 Tolerance (1)&(2)
(g) (Nm)

M12 1.75 1.5 100 15 ʸ0.35 Ӎ4 16 ʸ0.35 12 28 6 +0.02 8 0 53 29ʛ34 52
200 +0.14 - 0.2 92

M16 2 1.5 100 20 ʸ0.42 Ӎ6 20 ʸ0.42 12 36 8 +0.03 12 0 123
200 +0.18 - 0.2 212 66ʛ78 120
257
- 250

1.5 100 217
- 200
M20 2.5 250 25 ʸ0.42 Ӎ6 20 ʸ0.42 12 40 10 +0.03 16 0 374 121ʛ143 220
300 +0.18 - 0.2 453

531

1.5 100 369
- 200
M24 3 250 35 ʸ0.42 Ӎ7 25 ʸ0.42 15 54 12 +0.05 20 0 613 204ʛ241 370
300 +0.23 - 0.2 735

857

M30 3.5 1.5 100 40 ʸ0.42 Ӎ7 30 ʸ0.42 20 64 17 +0.05 24 0 570 539ʛ637 980
200 +0.23 - 0.2 922
1,098
- 250

M36 4 1.5 100 40 ʸ0.5 Ӎ7 35 ʸ0.5 20 68 17 +0.05 30 0 948 539ʛ637 980
200 +0.23 - 0.2 1,501

PIN - HOLLOW TYPE
HLS-D (aka HLS-TP or HLS-PH)

Size Materials Plating

M14 - M36 Property Class 33H Black
Surface Hardness 33 - 44HRC Oxide Download CAD Files

Size Pitch Set Screw(1) Lock Screw(2) Thread Hexagonal Pin dia. Pin hole dia. Unit Reference Proof
S, S1 Coarse Fine (Concave) (Convex) length socket weigh tightening Torque
L (Nm)
H Tolerance t1 *Common to t torque
(1)&(2) *Common to

H1 Tolerance t2 l B Tolerance D Tolerance A,A1 Tolerance (g) (1)&(2)
(Nm)

M14 2 1.5 100 20 ±0.42 Ӎ5 16 ±0.35 9 32 6 +0.02 10 0 6 ±0.2 59 29～34 52
+0.14 -0.2

M16 2 1.5 100 20 ±0.42 Ӎ6 20 ±0.42 12 36 8 +0.03 12 0 7 ±0.2 87 66～78 120
- 200 +0.18 -0.2 146

M20 2.5 1.5 100 25 ±0.42 Ӎ6 20 ±0.42 12 40 10 +0.03 16 0 10 ±0.2 145 121～143 220
- 200 +0.18 -0.2 239

M24 3 1.5 100 35 ±0.42 Ӎ7 25 ±0.42 15 54 12 +0.05 20 0 12 ±0.2 224 204～241 370
- 200 +0.23 -0.2 345

M30 3.5 - 100 40 ±0.42 Ӎ7 30 ±0.42 20 64 17 +0.05 24 0 17 ±0.2 348 539～637 980
M36 4 200 +0.23 -0.2 507 980

- 100 40 ±0.5 Ӎ7 35 ±0.5 20 68 17 +0.05 30 0 17 ±0.2 703 539～637
200 +0.23 -0.2 1060

• External dimensions: JIS B1177(2007) / ISO4026
• Threads tolerance: Class 6g JIS B0209(2001) / ISO965
• Reference tightening torque is calculated by multiplying 0.6 plus or minus 5% of the proof torque of hexagonal wrenches

stipulated in JIS B4648 (ISO2936).

Materials of HARDLOCK Set Screw

Type Size Pitch Material Property
HARDLOCK Set Screw Standard Coarse Fine Class
HLS-A (HLS) Concave Convex

HARDLOCK Set Screw Standard Hollow M8 1.25 JIS SCM435 JIS SCM435 45H (45~53HRC)
HLS-B (HLS-T)
M10 1.5 JIS SCM435 JIS SCM435 45H (45~53HRC)
HARDLOCK Set Screw Pin
HLS-C (HLS-P) M12 1.75 JIS SCM435 JIS SCM435 45H (45~53HRC)

HARDLOCK Set Screw Pin Hollow 1.5 JIS S45C JIS S45C 33H (33~44HRC)
HLS-D (HLS-TP)
M14 2.0 JIS SCM435 JIS SCM435 45H (45~53HRC)

1.5 JIS S45C JIS S45C 33H (33~44HRC)

M16 2.0 JIS SCM435 JIS SCM435 45H (45~53HRC)

1.5 JIS S45C JIS S45C 33H (33~44HRC)

M18 2.5 JIS SCM435 JIS SCM435 45H (45~53HRC)

1.5 JIS S45C JIS S45C 33H (33~44HRC)

M20 2.5 JIS SCM435 JIS SCM435 45H (45~53HRC)

1.5 JIS S45C JIS S45C 33H (33~44HRC)

M22 2.5 1.5 JIS S45C JIS S45C 33H (33~44HRC)

M24 3.0 1.5 JIS S45C JIS S45C 33H (33~44HRC)

M30 3.5 1.5 JIS S45C JIS S45C 33H (33~44HRC)

M36 4.0 1.5 JIS S45C JIS S45C 33H (33~44HRC)

M12 1.8 JIS S45C JIS S45C

M14 2.0 1.5 JIS S45C JIS S45C

M16 2.0 1.5 JIS S45C JIS S45C 33H
M20 2.5 1.5 JIS S45C JIS S45C 33~44HRC
M24 3.0 1.5 JIS S45C JIS S45C

M30 3.5 1.5 JIS S45C JIS S45C

M36 4.0 1.5 JIS S45C JIS S45C

M12 1.75 1.5 JIS S45C JIS SCM435
JIS S45C JIS S45C

M16 2.0 1.5 JIS S45C JIS SCM435 33H
M20 2.5 1.5 JIS S45C JIS S45C 33~44HRC
JIS S45C
JIS S45C JIS SCM435
JIS S45C

M24 3.0 1.5 JIS S45C JIS S45C

M30 3.5 1.5 JIS S45C JIS S45C

M36 4.0 1.5 JIS S45C JIS S45C

M14 2.0 1.5 JIS S45C JIS S45C

M16 2.0 1.5 JIS S45C JIS S45C

M20 2.5 1.5 JIS S45C JIS S45C 33H

M24 3.0 1.5 JIS S45C JIS S45C 33~44HRC

M30 3.5 JIS S45C JIS S45C

M36 4.0 JIS S45C JIS S45C

These materials are subject to change without notice due to the availability of material screw.

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ENGINEER