10.9 Bolt Torque Chart

Tightening torque and clamp force for Class 10.9 bolts from M1.6 to M64. For example, an M8 10.9 bolt needs about 37.4 N·m (27.6 ft·lb) with dry threads.

Alloy steel, quenched and tempered. Used where high clamping force is needed: engines, suspension, heavy machinery.

Standard
Metric (ISO 898-1)
Yield strength used
900 MPa (131 ksi)
Tensile strength
1000 MPa (145 ksi)
Sizes covered
M1.6 – M64
Class 10.9 — Coarse thread, tightening torque at 70% of yield
Size Threadpitch Clamp forcepreload Dryμ 0.15 Oiledμ 0.11 PTFE / moly pasteμ 0.06
M1.6 M1.6×0.350.35 mm 0.80 kN180 lbf 0.29 N·m0.21 ft·lb 0.22 N·m0.16 ft·lb 0.15 N·m0.11 ft·lb
M2 M2×0.40.4 mm 1.31 kN294 lbf 0.58 N·m0.43 ft·lb 0.44 N·m0.33 ft·lb 0.30 N·m0.22 ft·lb
M2.5 M2.5×0.450.45 mm 2.14 kN480 lbf 1.18 N·m0.87 ft·lb 0.88 N·m0.65 ft·lb 0.59 N·m0.44 ft·lb
M3 M3×0.50.5 mm 3.17 kN713 lbf 2.01 N·m1.48 ft·lb 1.51 N·m1.12 ft·lb 1.01 N·m0.75 ft·lb
M3.5 M3.5×0.60.6 mm 4.27 kN960 lbf 3.09 N·m2.28 ft·lb 2.33 N·m1.72 ft·lb 1.57 N·m1.16 ft·lb
M4 M4×0.70.7 mm 5.53 kN1243 lbf 4.62 N·m3.41 ft·lb 3.49 N·m2.57 ft·lb 2.35 N·m1.73 ft·lb
M5 M5×0.80.8 mm 8.93 kN2009 lbf 8.98 N·m6.62 ft·lb 6.76 N·m4.98 ft·lb 4.53 N·m3.34 ft·lb
M6 M6×11 mm 12.7 kN2850 lbf 15.5 N·m11.5 ft·lb 11.7 N·m8.63 ft·lb 7.86 N·m5.80 ft·lb
M7 M7×11 mm 18.2 kN4087 lbf 25.2 N·m18.6 ft·lb 18.8 N·m13.9 ft·lb 12.5 N·m9.23 ft·lb
M8 M8×1.251.25 mm 23.1 kN5185 lbf 37.4 N·m27.6 ft·lb 28.1 N·m20.7 ft·lb 18.8 N·m13.8 ft·lb
M10 M10×1.51.5 mm 36.5 kN8213 lbf 73.1 N·m53.9 ft·lb 54.8 N·m40.4 ft·lb 36.5 N·m26.9 ft·lb
M12 M12×1.751.75 mm 53.1 kN11935 lbf 125.4 N·m92.5 ft·lb 94.0 N·m69.3 ft·lb 62.6 N·m46.2 ft·lb
M14 M14×22 mm 72.7 kN16350 lbf 199.4 N·m147.1 ft·lb 149.4 N·m110.2 ft·lb 99.3 N·m73.3 ft·lb
M16 M16×22 mm 98.7 kN22189 lbf 305.6 N·m225.4 ft·lb 227.7 N·m168.0 ft·lb 149.9 N·m110.6 ft·lb
M18 M18×2.52.5 mm 121.3 kN27260 lbf 426.9 N·m314.8 ft·lb 319.4 N·m235.6 ft·lb 211.9 N·m156.3 ft·lb
M20 M20×2.52.5 mm 154.2 kN34670 lbf 597.5 N·m440.7 ft·lb 445.3 N·m328.4 ft·lb 293.1 N·m216.1 ft·lb
M22 M22×2.52.5 mm 191.1 kN42970 lbf 815.2 N·m601.3 ft·lb 605.3 N·m446.5 ft·lb 395.5 N·m291.7 ft·lb
M24 M24×33 mm 222.1 kN49925 lbf 1029.2 N·m759.1 ft·lb 767.1 N·m565.8 ft·lb 505.0 N·m372.5 ft·lb
M27 M27×33 mm 289.4 kN65065 lbf 1510.9 N·m1114.4 ft·lb 1121.1 N·m826.9 ft·lb 731.4 N·m539.4 ft·lb
M30 M30×3.53.5 mm 353.2 kN79396 lbf 2056.1 N·m1516.5 ft·lb 1528.2 N·m1127.1 ft·lb 1000.2 N·m737.7 ft·lb
M33 M33×3.53.5 mm 436.9 kN98228 lbf 2767.7 N·m2041.4 ft·lb 2051.0 N·m1512.7 ft·lb 1334.2 N·m984.0 ft·lb
M36 M36×44 mm 514.5 kN115672 lbf 3568.8 N·m2632.2 ft·lb 2648.5 N·m1953.4 ft·lb 1728.2 N·m1274.6 ft·lb
M39 M39×44 mm 614.7 kN138195 lbf 4601.3 N·m3393.8 ft·lb 3405.9 N·m2512.1 ft·lb 2210.5 N·m1630.4 ft·lb
M42 M42×4.54.5 mm 706.2 kN158754 lbf 5710.6 N·m4212.0 ft·lb 4232.7 N·m3121.9 ft·lb 2754.8 N·m2031.9 ft·lb
M45 M45×4.54.5 mm 822.8 kN184969 lbf 7105.5 N·m5240.8 ft·lb 5255.2 N·m3876.0 ft·lb 3404.9 N·m2511.3 ft·lb
M48 M48×55 mm 928.1 kN208641 lbf 8607.3 N·m6348.4 ft·lb 6373.0 N·m4700.4 ft·lb 4138.6 N·m3052.5 ft·lb
M52 M52×55 mm 1107.4 kN248961 lbf 11013.8 N·m8123.4 ft·lb 8136.6 N·m6001.2 ft·lb 5259.4 N·m3879.1 ft·lb
M56 M56×5.55.5 mm 1278.9 kN287510 lbf 13738.3 N·m10132.9 ft·lb 10155.1 N·m7490.0 ft·lb 6571.9 N·m4847.2 ft·lb
M60 M60×5.55.5 mm 1488.1 kN334532 lbf 16983.9 N·m12526.7 ft·lb 12530.9 N·m9242.3 ft·lb 8078.0 N·m5958.0 ft·lb
M64 M64×66 mm 1685.9 kN378997 lbf 20460.9 N·m15091.2 ft·lb 15108.0 N·m11143.1 ft·lb 9755.0 N·m7194.9 ft·lb
Class 10.9 — Fine thread, tightening torque at 70% of yield
Size Threadpitch Clamp forcepreload Dryμ 0.15 Oiledμ 0.11 PTFE / moly pasteμ 0.06
M1.6 M1.6×0.20.2 mm 0.99 kN222 lbf 0.34 N·m0.25 ft·lb 0.25 N·m0.18 ft·lb 0.16 N·m0.12 ft·lb
M2 M2×0.250.25 mm 1.54 kN347 lbf 0.67 N·m0.49 ft·lb 0.49 N·m0.36 ft·lb 0.32 N·m0.24 ft·lb
M2.5 M2.5×0.350.35 mm 2.33 kN525 lbf 1.26 N·m0.93 ft·lb 0.94 N·m0.69 ft·lb 0.62 N·m0.46 ft·lb
M3 M3×0.350.35 mm 3.53 kN794 lbf 2.19 N·m1.61 ft·lb 1.62 N·m1.20 ft·lb 1.06 N·m0.78 ft·lb
M3.5 M3.5×0.350.35 mm 4.98 kN1119 lbf 3.48 N·m2.56 ft·lb 2.57 N·m1.89 ft·lb 1.66 N·m1.22 ft·lb
M4 M4×0.50.5 mm 6.17 kN1387 lbf 5.03 N·m3.71 ft·lb 3.74 N·m2.76 ft·lb 2.45 N·m1.81 ft·lb
M5 M5×0.50.5 mm 10.2 kN2284 lbf 9.89 N·m7.30 ft·lb 7.31 N·m5.39 ft·lb 4.73 N·m3.49 ft·lb
M6 M6×0.750.75 mm 13.9 kN3120 lbf 16.6 N·m12.3 ft·lb 12.4 N·m9.14 ft·lb 8.13 N·m6.00 ft·lb
M7 M7×0.750.75 mm 19.6 kN4410 lbf 26.6 N·m19.6 ft·lb 19.7 N·m14.6 ft·lb 12.8 N·m9.47 ft·lb
M8 M8×11 mm 24.7 kN5547 lbf 39.3 N·m29.0 ft·lb 29.3 N·m21.6 ft·lb 19.2 N·m14.2 ft·lb
M10 M10×1.251.25 mm 38.6 kN8668 lbf 76.1 N·m56.1 ft·lb 56.7 N·m41.8 ft·lb 37.2 N·m27.5 ft·lb
M12 M12×1.51.5 mm 55.5 kN12481 lbf 129.7 N·m95.6 ft·lb 96.6 N·m71.3 ft·lb 63.6 N·m46.9 ft·lb
M14 M14×1.51.5 mm 78.5 kN17639 lbf 211.0 N·m155.6 ft·lb 156.4 N·m115.4 ft·lb 101.8 N·m75.1 ft·lb
M16 M16×1.51.5 mm 105.4 kN23687 lbf 320.7 N·m236.5 ft·lb 236.8 N·m174.6 ft·lb 152.8 N·m112.7 ft·lb
M18 M18×1.51.5 mm 136.2 kN30625 lbf 465.3 N·m343.2 ft·lb 342.4 N·m252.5 ft·lb 219.5 N·m161.9 ft·lb
M20 M20×1.51.5 mm 171.0 kN38453 lbf 644.8 N·m475.6 ft·lb 473.3 N·m349.1 ft·lb 301.7 N·m222.6 ft·lb
M22 M22×1.51.5 mm 209.8 kN47171 lbf 872.9 N·m643.8 ft·lb 639.2 N·m471.5 ft·lb 405.6 N·m299.1 ft·lb
M24 M24×22 mm 242.2 kN54445 lbf 1097.0 N·m809.1 ft·lb 807.4 N·m595.5 ft·lb 517.7 N·m381.9 ft·lb
M27 M27×22 mm 312.3 kN70211 lbf 1597.7 N·m1178.4 ft·lb 1172.2 N·m864.6 ft·lb 746.7 N·m550.7 ft·lb
M30 M30×22 mm 391.4 kN87980 lbf 2217.0 N·m1635.2 ft·lb 1622.7 N·m1196.9 ft·lb 1028.5 N·m758.6 ft·lb
M33 M33×22 mm 479.3 kN107752 lbf 2960.8 N·m2183.8 ft·lb 2163.3 N·m1595.5 ft·lb 1365.7 N·m1007.3 ft·lb
M36 M36×33 mm 544.9 kN122501 lbf 3722.4 N·m2745.5 ft·lb 2739.2 N·m2020.4 ft·lb 1756.0 N·m1295.2 ft·lb
M39 M39×33 mm 647.9 kN145650 lbf 4781.7 N·m3526.8 ft·lb 3511.6 N·m2590.0 ft·lb 2241.5 N·m1653.3 ft·lb
M42 M42×33 mm 759.8 kN170802 lbf 6024.7 N·m4443.6 ft·lb 4416.8 N·m3257.6 ft·lb 2808.8 N·m2071.7 ft·lb
M45 M45×33 mm 880.6 kN197956 lbf 7466.2 N·m5506.8 ft·lb 5465.2 N·m4030.9 ft·lb 3464.2 N·m2555.0 ft·lb
M48 M48×33 mm 1010.2 kN227112 lbf 9157.8 N·m6754.4 ft·lb 6693.9 N·m4937.2 ft·lb 4230.0 N·m3119.9 ft·lb
M52 M52×44 mm 1151.8 kN258934 lbf 11334.4 N·m8359.8 ft·lb 8323.8 N·m6139.3 ft·lb 5313.2 N·m3918.9 ft·lb
M56 M56×44 mm 1350.7 kN303648 lbf 14297.4 N·m10545.2 ft·lb 10481.2 N·m7730.5 ft·lb 6665.0 N·m4915.9 ft·lb
M60 M60×44 mm 1565.4 kN351922 lbf 17620.9 N·m12996.5 ft·lb 12899.6 N·m9514.3 ft·lb 8178.3 N·m6032.0 ft·lb
M64 M64×44 mm 1796.0 kN403755 lbf 21421.6 N·m15799.7 ft·lb 15662.4 N·m11552.0 ft·lb 9903.3 N·m7304.3 ft·lb

Preload is 70% of yield. Torque per ISO 16047 / VDI 2230 for standard hex heads, with the same friction μ in the threads and under the head. Click a size for wrench size, tap drill and a worked example. Always follow the manufacturer's value where one exists.

Frequently asked questions

What is the torque for an M8 10.9 bolt?

About 37.4 N·m (27.6 ft·lb) with dry threads and 28.1 N·m (20.7 ft·lb) with oiled threads (M8×1.25, 70% of yield, clamp force 23.1 kN).

What is the torque for an M10 10.9 bolt?

About 73.1 N·m (53.9 ft·lb) with dry threads and 54.8 N·m (40.4 ft·lb) with oiled threads (M10×1.5, 70% of yield, clamp force 36.5 kN).

What is the torque for an M12 10.9 bolt?

About 125.4 N·m (92.5 ft·lb) with dry threads and 94.0 N·m (69.3 ft·lb) with oiled threads (M12×1.75, 70% of yield, clamp force 53.1 kN).

Other grades

4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9 Grade 2 Grade 5 Grade 8 A307 A325 A490 A574 A2-70 A4-70 A4-80
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