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Fastener Torque Charts


Fastener Torque Charts
Fastener Torque Charts
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A55
FASTENER TORQUE CHARTS
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Si z e Cl a S S
Ne w t o N Me t e r S Fo o t Po u N d S (a P P r o x .)
C
l a S S iM a g e
zi N C
Pl a t e d uN P l a t e d
zi N C
Pl a t e d uN P l a t e d
M4 x .70 Pitch 8.8 3.1 2.2 2.30 1.65
M5 x .80 Pitch 8.8 6.1 5.5 4.58 4.13
M6 x 1.00 Pitch 8.8 10.4 9.5 7.80 7.13
M7 x 1.00 Pitch 8.8 17.0 15.5 12.75 11.63
M8 x 1.25 Pitch 8.8 25.0 23.0 18.75 17.25
M8 x 1.00 Pitch 8.8 27.0 24.5 20.25 18.38
M10 x 1.50 Pitch 8.8 51.0 46.0 38.25 34.50
M10 x 1.00 Pitch 8.8 57.0 52.0 42.75 39.00
M10 x 1.25 Pitch 8.8 54.0 49.0 40.50 36.75
M12 x 1.75 Pitch 8.8 87.0 79.0 65.25 59.25
M12 x 1.25 Pitch 8.8 96.0 87.0 72.00 65.25
M12 x 1.50 Pitch 8.8 92.0 83.0 69.00 62.25
M14 x 2.00 Pitch 8.8 140.0 125.0 105.00 93.75
M14 x 1.50 Pitch 8.8 150.0 135.0 112.50 101.25
M16 x 2.00 Pitch 8.8 215.0 195.0 161.25 146.25
M18 x 2.50 Pitch 8.8 300.0 280.0 225.00 210.00
M20 x 2.50 Pitch 8.8 430.0 390.0 322.50 292.50
M22 x 2.50 Pitch 8.8 580.0 530.0 435.00 397.50
M24 x 3.00 Pitch 8.8 740.0 670.0 555.00 502.50
M6 x 1.00 Pitch 10.9 15.5 14.0 11.63 10.50
M8 x 1.25 Pitch 10.9 37.0 34.0 27.75 25.50
M10 x 1.50 Pitch 10.9 75.0 68.0 56.25 51.00
M12 x 1.75 Pitch 10.9 160.0 117.0 97.50 87.75
M14 x 2.00 Pitch 10.9 205.0 185.0 153.75 138.75
M16 x 2.00 Pitch 10.9 310.0 280.0 232.50 210.00
METRIC TORQUE CHART fOR
HEX HEAD CAP SCREWS
TORQUE CHART fOR
STAInlESS STEEl CAP SCREWS
Si z e
316
i N C h -l b
18/8
i N C h -l b
6-32 10.1 9.6
6-40 12.7 12.1
8-32 20.7 19.8
8-36 23.0 22.0
10-24 23.8 22.8
10-32 33.1 31.7
1/4-20 78.8 75.2
1/4-28 99.0 94.0
5/16-18 138.0 132.0
5/16-24 147.0 142.0
3/8-16 247.0 236.0
3/8-24 271.0 259.0
7/16-14 393.0 376.0
7/16-20 418.0 400.0
1/2-13 542.0 517.0
1/2-20 565.0 541.0
9/16-12 713.0 682.0
9/16-18 787.0 752.0
5/8-11 1,160.0 1,110.0
5/8-18 1,301.0 1,244.0
3/4-10 1,582.0 1,530.0
3/4-16 1,558.0 1,490.0
7/8-9 2,430.0 2,328.0
7/8-14 2,420.0 2,318.0
1"-8 3,595.0 3,440.0
1"-14 3,250.0 3,110.0
GUIDE fOR PREVAIlInG-TORQUE lOCK nUT ASSEMBlY TORQUES (CAD AnD WAX, GRADE B, C,
AnD GRADE G flAnGE nUTS) lOCK nUT STAnDARDS fROM IfI-100 REQUIREMEnTS
Torque-Tension Requirements
Si z e
grade b grade C grade g
C
l a M P lo a d aS S e Mb l y to r q u e Cl a M P lo a d aS S e M b l y to r q u e Cl a M P lo a d aS S e M b ly to r q u e
th r e a d S Pe r iN C h (l b ) Ma x . MiN . (l b ) Ma x . Mi N. (l b ) Ma x . Mi N.
1/4–20 2,000 85** 60** 2,850 125** 85** 2,850 150** 100**
1/4–28 2,300 90** 65** 3,250 125** 85** 3,250 160** 105**
5/16–18 3,350 150** 110** 4,700 190** 130** 4,700 240** 155**
5/16–24 3,700 160** 120** 5,200 200** 140** 5,200 230** 155**
3/8–16 4,950 20 14.5 6,950 28 20 6,950 32 21
3/8–24 5,600 22 16 7,900 29 21 7,900 33 22
7/16–14 6,800 32 23 9,600 43 31 9,600 51 34
7/16–20 7,550 34 24 10,700 43 31 10,700 60 40
1/2–13 9,050 50 37 12,800 62.5 45 12,800 85 55
1/2–20 10,200 52.5 37.5 14,440 70 50 14,440 89 59
9/16–12 11,600 70 50 16,400 95 70 16,400 120 80
9/16–18 13,000 77.5 57.5 18,300 95 70 18,300 132 88
5/8–11 14,500 95 70 20,300 122.5 90 20,300 143 95
5/8–18 16,300 97.5 72.5 23,000 125 90 23,000 175 115
3/4–10 21,300 165 125 30,100 210 155 30,100 240 160
3/4–16 23,800 165 120 33,600 210 155 33,600 270 170
7/8–9 29,500 250 185 41,600 312.5 225 41,600 360 260
7/8–14 32,400 270 200 45,800 312.5 225 45,800 402 247
1–8 38,700 375 275 54,600 462.5 360 54,600 530 410
1–12 42,300 395 290 59,750 490 360 59,750
1–14 43,000 400 300 61,100 500 362.5 61,100 645 398
1-1/8–7 42,100 404 294 69,000 585 454 69,000
1-1/8–12 47,500 437 327 76,800 622 453 76,800
1-1/4–7 53,500 513 375 87,000 736 573 87,000
1-1/4–12 59,700 549 412 96,600 782 570 96,600
1-3/8–6 63,800 612 445 104,000 880 685 104,000
1-3/8–12 72,900 670 503 118,000 955 696 118,000
1-1/2–6 77,600 745 545 127,000 1,075 837 127,000
1-1/2–12 87,700 807 605 142,000 1,150 837 142,000
Clamp loads for
the Grade B lock
nuts equal 75%
of the bolt proof
loads specified
for SAE J-429
Grade 5, and
ASTM A-449
bolts.
Clamp loads for
Grade C lock
nuts equal 75%
of the bolt proof
loads specified
for SAE J-429
Grade 8, and
ASTM A-354
Grade BD bolts.
IFI-100 does not
govern lock nuts
above 1". The
values shown in
the chart are to
be used as a mid-
range guideline.
** Torque values
for 1/4" and
5/16" sizes are in
inch lb. All other
torque values are
in foot lb.
Grade C
Grade B
Grade G
Fastener Torque Charts
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