A5-2 12/01 A05006
Standard Assembly Torques For 12-Point, Grade 9,
Capscrews (SAE)
The following specifications apply to required assembly
torques for all 12-Point, Grade 9 (170,000 psi minimum
tensile), Capscrews.
•Capscrew threads and seats SHALL be lubri-
cated when assembled.
Unless instructions specifically recommend other-
wise, these standard torque values are to be used
with simple lithium base chassis grease (multi-pur-
pose 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.
Standard Metric Assembly Torque For Class 10.9
Capscrews & Class 10 Nuts
The following specifications apply to required assembly
torques for all metric Class 10.9 finished hexagon head
capscrews and Class 10 nuts.
•Capscrew threads and seats SHALL NOT be
lubricated when assembled. These specifications
are based on all capscrews, nuts, and hardened
washers being phosphate and oil coated.NOTE:
If zinc-plated hardware is used, each piece must
be lubricated with a Rust Preventive Grease or
Lithium-base grease to achieve the same clamp-
ing forces provided below.
•Torques are calculated to give a clamping force
of approximately 75% of proof load.
•The maximum torque tolerance shall be within
±10% of the torque value shown.
Suggested* Sources for Rust Preventive Grease:
•AMERICAN ANTI-RUST GREASE #3-X from Stan-
dard Oil Company (also American Oil Co.)
•GULF NORUST #3 from Gulf Oil Company.
•MOBILARMA 355, Product No. 66705 from Mobil
Oil Corporation.
•RUST BAN 326 from Humble Oil Company.
•RUSTOLENE B GREASE from Sinclair Oil Com-
pany.
•RUST PREVENTIVE GREASE - CODE 312 from
the Southwest Grease and Oil Company.
* NOTE: This list represents the current Engineer-
ing approved sources for use in Komatsu manufac-
ture. It is not exclusive. Other products may meet
the same specifications of this list.
TABLE II. - STANDARD ASSEMBLY TORQUE
for 12-Point, Grade 9 Capscrews
CAPSCREW
SIZE*
TORQUE
ft. lbs.
TORQUE
N.m
TORQUE
kg.m
0.250 - 20 12 16 1.7
0.312 - 18 24 33 3.3
0.375 - 16 42 57 5.8
0.438 -14 70 95 9.7
0.500 -13 105 142 14.5
0.562 - 12 150 203 20.7
0.625 - 11 205 278 28.3
0.750 - 10 360 488 49.7
0.875 - 9 575 780 79.4
1.000 - 8 860 1166 119
1.000 - 12 915 1240 126
1.125 - 7 1230 1670 170
1.125 - 12 1330 1800 184
1.250 - 7 1715 2325 237
1.250 - 12 1840 2495 254
1.375 - 6 2270 3080 313
1.375 - 12 2475 3355 342
1.500 - 6 2980 4040 411
1.500 - 12 3225 4375 445
* Shank Diameter (in.) - Threads per inch
This table represents standard values only. Do not use these val-
ues to replace torque values which are specified in assembly
instructions.
TABLE III. - STANDARD METRIC ASSEMBLY TORQUE
CAPSCREW
SIZE*
TORQUE
N.m
TORQUE
ft.lbs.
TORQUE
kg.m
M6 x1 12 9 1.22
M8 x 1.25 30 22 3.06
M10 x 1.5 55 40 5.61
M12 x 1.75 95 70 9.69
M14 x 2 155 114 15.81
M16 x 2 240 177 24.48
M20 x 2.25 465 343 47.43
M24 x 3 800 590 81.6
M30 x 3.5 1600 1180 163.2
M36 x 4 2750 2028 280.5
* Shank Diameter (mm) - Threads per millimeter
This table represents standard values only. Do not use these val-
ues to replace torque values which are specified in assembly
instructions.
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