Torque Tables And Conversion Charts - Section 12 02/11 OM1200
Page 12-4
STANDARD TIGHTENING TORQUES
For SAE Grade 9 Cap screws
The following specifications apply to required assem-
bly torques for all 12-point, grade 9 (170,000 psi min-
imum tensile), cap screws.
• Cap screw threads and seats shall be lubricated
when assembled.
Unless instructions specifically recommend
otherwise, these standard torque values are to be
used with simple lithium base chassis grease (multi-
purpose EP NLGI) or a rust- preventive grease (see
list, this page) on the threads.
• Torques are calculated to give a clamping force
of approximately 75% of proof load.
• The maximum torque tolerance shall be ±10% of
the torque value shown.
TABLE 3.
Standard Tightening Torque
for 12-Point, Grade 9 Cap Screws
Cap Screw Size*
Torque
N·m
Torque
ft lb
Torque
kg·m
0.250 - 20 16 12 1.7
0.312 - 18 33 24 3.3
0.375 - 16 57 42 5.8
0.438 -14 95 70 9.7
0.500 -13 142 105 14.5
0.562 - 12 203 150 20.7
0.625 - 11 278 205 28.3
0.750 - 10 488 360 49.7
0.875 - 9 780 575 79.4
1.000 - 8 1166 860 119
1.000 - 12 1240 915 126
1.125 - 7 1670 1230 170
1.125 - 12 1800 1330 184
1.250 - 7 2325 1715 237
1.250 - 12 2495 1840 254
1.375 - 6 3080 2270 313
1.375 - 12 3355 2475 342
1.500 - 6 4040 2980 411
1.500 - 12 4375 3225 445
* Shank Diameter (in.) - Threads per inch
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