Standard Charts and Tables - Section 12 OM1200 Page 12-2 Standard Assembly Torques For 12-Point, Grade 9, Standard Metric Assembly Torque For Class 10.9 Capscrews (SAE) Capscrews & Class 10 Nuts The following specifications apply to required assembly The following specifications apply to required assembly torques for all 12-Point, Grade 9 (170,000 psi minimum torques for all metric Class 10.9 finished hexagon head tensile), Capscrews. capscrews and Class 10 nuts. • Capscrew threads and seats SHALL be lubri- • Capscrew threads and seats SHALL NOT be cated when assembled. lubricated when assembled.
These specifications are based on all capscrews, nuts, and hardened Unless instructions specifically recommend otherwise, washers being phosphate and oil coated. these standard torque values are to be used with simple lithium base chassis grease (multi-purpose EP NOTE: If zinc-plated hardware is used, each piece NLGI) or a rust- preventive grease (see list, this page) must be lubricated with a Rust Preventive Grease or on the threads. Lithium-base grease to achieve the same clamping forces provided below. • Torques are calculated to give a clamping force of approximately 75% of proof load. • 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. • The maximum torque tolerance shall be within ±10% of the torque value shown. TABLE II. - STANDARD ASSEMBLY TORQUE TABLE III. - STANDARD METRIC ASSEMBLY TORQUE for 12-Point, Grade 9 Capscrews CAPSCREW TORQUE TORQUE TORQUE CAPSCREW TORQUE TORQUE TORQUE SIZE* N.m ft.lbs. kg.m SIZE* ft. lbs.
N.m kg.m M6 x1 12 9 1.22 0.250 - 20 12 16 1.7 M8 x 1.25 30 22 3.06 0.312 - 18 24 33 3.3 M10 x 1.5 55 40 5.61 0.375 - 16 42 57 5.8 M12 x 1.75 95 70 9.69 0.438 -14 70 95 9.7 M14 x 2 155 114 15.81 0.500 -13 105 142 14.5 M16 x 2 240 177 24.48 0.562 - 12 150 203 20.7 M20 x 2.25 465 343 47.43 0.625 - 11 205 278 28.3 M24 x 3 800 590 81.6 0.750 - 10 360 488 49.7 M30 x 3.5 1600 1180 163.2 0.875 - 9 575 780 79.4 M36 x 4 2750 2028 280.5 1.000 - 8 860 1166 119 * Shank Diameter (mm) - Threads per millimeter 1.000 - 12 915 1240 126 This table represents standard values only. Do not use these val- 1.125 - 7 1230 1670 170 ues to replace torque values which are specified in assembly instructions.
1.125 - 12 1330 1800 184 1.250 - 7 1715 2325 237 Suggested* Sources for Rust Preventive Grease: 1.250 - 12 1840 2495 254 • AMERICAN ANTI-RUST GREASE #3-X from 1.375 - 6 2270 3080 313 Standard Oil Company (also American Oil Co.) 1.375 - 12 2475 3355 342 • GULF NORUST #3 from Gulf Oil Company. 1.500 - 6 2980 4040 411 1.500 - 12 3225 4375 445 • MOBILARMA 355, Product No. 66705 from Mobil Oil Corporation. * Shank Diameter (in.) - Threads per inch This table represents standard values only. Do not use these val- • RUST BAN 326 from Humble Oil Company. ues to replace torque values which are specified in assembly • RUSTOLENE B GREASE from Sinclair Oil Co. instructions.
• 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 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. 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.