Standard Charts and Tables - Section 12 OM1200 3/05 Page 12-2 STANDARD ASSEMBLY TORQUES For 12-Point, Grade 9 Cap screws (SAE) STANDARD ASSEMBLY TORQUES For Class 10.9 Cap screws & Class 10 Nuts The following specifications apply to required assembly torques for all 12-point, grade 9 (170,000 psi minimum tensile) cap screws. The following specifications apply to required assembly torques for all metric Class 10.9 finished hexagon head cap screws and Class 10 nuts. Cap screw threads and seats shall be lubricated when assembled. Cap screw threads and seats shall not be lubricated when assembled.
These specifications are based on all cap screws, nuts, and hardened washers being phosphate and oil coated. NOTE: Unless the 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. NOTE: If zinc-plated hardware is used, each piece must be lubricated with simple lithium base chassis grease (multi-purpose EP NLGI) or a rust preventive grease (see list, this page) to achieve the same clamping forces provided below. 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. 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. TABLE II. STANDARD ASSEMBLY TORQUE for 12-Point, Grade 9 Cap screws TABLE III. STANDARD ASSEMBLY TORQUE for Metric Class 10.9 Cap screws & Class 10 Nuts Suggested* Sources for Rust Preventive Grease: AMERICAN ANTI-RUST GREASE #3-X from Standard 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 Co.
RUST PREVENTIVE GREASE - CODE 312 from the Southwest Grease and Oil Company. NOTE: This list represents the current engineering approved sources for use in Komatsu manufacture. It is not exclusive. Other products may meet the same specifications of this list.
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 values to replace torque values which are specified in assembly instructions.
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 values to replace torque values which are specified in assembly instructions.