5.8 Bolt Torque Chart

Tightening torque and clamp force for Class 5.8 bolts from M1.6 to M64. For example, an M8 5.8 bolt needs about 16.6 N·m (12.2 ft·lb) with dry threads.

Cold-formed carbon steel. A step up from 4.8, still intended for light-duty applications.

Standard
Metric (ISO 898-1)
Yield strength used
400 MPa (58 ksi)
Tensile strength
500 MPa (73 ksi)
Sizes covered
M1.6 – M64
Class 5.8 — 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 0.36 kN80 lbf 0.13 N·m0.09 ft·lb 0.10 N·m0.07 ft·lb 0.07 N·m0.05 ft·lb
M2 M2×0.40.4 mm 0.58 kN131 lbf 0.26 N·m0.19 ft·lb 0.20 N·m0.14 ft·lb 0.13 N·m0.10 ft·lb
M2.5 M2.5×0.450.45 mm 0.95 kN213 lbf 0.52 N·m0.39 ft·lb 0.39 N·m0.29 ft·lb 0.26 N·m0.19 ft·lb
M3 M3×0.50.5 mm 1.41 kN317 lbf 0.89 N·m0.66 ft·lb 0.67 N·m0.50 ft·lb 0.45 N·m0.33 ft·lb
M3.5 M3.5×0.60.6 mm 1.90 kN426 lbf 1.37 N·m1.01 ft·lb 1.04 N·m0.76 ft·lb 0.70 N·m0.51 ft·lb
M4 M4×0.70.7 mm 2.46 kN553 lbf 2.06 N·m1.52 ft·lb 1.55 N·m1.14 ft·lb 1.04 N·m0.77 ft·lb
M5 M5×0.80.8 mm 3.97 kN893 lbf 3.99 N·m2.94 ft·lb 3.00 N·m2.21 ft·lb 2.01 N·m1.48 ft·lb
M6 M6×11 mm 5.63 kN1267 lbf 6.90 N·m5.09 ft·lb 5.20 N·m3.83 ft·lb 3.49 N·m2.58 ft·lb
M7 M7×11 mm 8.08 kN1817 lbf 11.2 N·m8.25 ft·lb 8.37 N·m6.18 ft·lb 5.56 N·m4.10 ft·lb
M8 M8×1.251.25 mm 10.3 kN2304 lbf 16.6 N·m12.2 ft·lb 12.5 N·m9.20 ft·lb 8.34 N·m6.15 ft·lb
M10 M10×1.51.5 mm 16.2 kN3650 lbf 32.5 N·m24.0 ft·lb 24.4 N·m18.0 ft·lb 16.2 N·m12.0 ft·lb
M12 M12×1.751.75 mm 23.6 kN5304 lbf 55.7 N·m41.1 ft·lb 41.8 N·m30.8 ft·lb 27.8 N·m20.5 ft·lb
M14 M14×22 mm 32.3 kN7266 lbf 88.6 N·m65.4 ft·lb 66.4 N·m49.0 ft·lb 44.1 N·m32.6 ft·lb
M16 M16×22 mm 43.9 kN9862 lbf 135.8 N·m100.2 ft·lb 101.2 N·m74.6 ft·lb 66.6 N·m49.1 ft·lb
M18 M18×2.52.5 mm 53.9 kN12115 lbf 189.7 N·m139.9 ft·lb 141.9 N·m104.7 ft·lb 94.2 N·m69.5 ft·lb
M20 M20×2.52.5 mm 68.5 kN15409 lbf 265.5 N·m195.9 ft·lb 197.9 N·m146.0 ft·lb 130.2 N·m96.1 ft·lb
M22 M22×2.52.5 mm 85.0 kN19098 lbf 362.3 N·m267.2 ft·lb 269.0 N·m198.4 ft·lb 175.8 N·m129.6 ft·lb
M24 M24×33 mm 98.7 kN22189 lbf 457.4 N·m337.4 ft·lb 340.9 N·m251.5 ft·lb 224.4 N·m165.5 ft·lb
M27 M27×33 mm 128.6 kN28918 lbf 671.5 N·m495.3 ft·lb 498.3 N·m367.5 ft·lb 325.1 N·m239.7 ft·lb
M30 M30×3.53.5 mm 157.0 kN35287 lbf 913.8 N·m674.0 ft·lb 679.2 N·m500.9 ft·lb 444.6 N·m327.9 ft·lb
M33 M33×3.53.5 mm 194.2 kN43657 lbf 1230.1 N·m907.3 ft·lb 911.5 N·m672.3 ft·lb 593.0 N·m437.4 ft·lb
M36 M36×44 mm 228.7 kN51410 lbf 1586.1 N·m1169.9 ft·lb 1177.1 N·m868.2 ft·lb 768.1 N·m566.5 ft·lb
M39 M39×44 mm 273.2 kN61420 lbf 2045.0 N·m1508.3 ft·lb 1513.7 N·m1116.5 ft·lb 982.4 N·m724.6 ft·lb
M42 M42×4.54.5 mm 313.9 kN70557 lbf 2538.1 N·m1872.0 ft·lb 1881.2 N·m1387.5 ft·lb 1224.4 N·m903.1 ft·lb
M45 M45×4.54.5 mm 365.7 kN82208 lbf 3158.0 N·m2329.2 ft·lb 2335.6 N·m1722.7 ft·lb 1513.3 N·m1116.1 ft·lb
M48 M48×55 mm 412.5 kN92729 lbf 3825.5 N·m2821.5 ft·lb 2832.4 N·m2089.1 ft·lb 1839.4 N·m1356.7 ft·lb
M52 M52×55 mm 492.2 kN110649 lbf 4895.0 N·m3610.4 ft·lb 3616.3 N·m2667.2 ft·lb 2337.5 N·m1724.0 ft·lb
M56 M56×5.55.5 mm 568.4 kN127782 lbf 6105.9 N·m4503.5 ft·lb 4513.4 N·m3328.9 ft·lb 2920.9 N·m2154.3 ft·lb
M60 M60×5.55.5 mm 661.4 kN148681 lbf 7548.4 N·m5567.4 ft·lb 5569.3 N·m4107.7 ft·lb 3590.2 N·m2648.0 ft·lb
M64 M64×66 mm 749.3 kN168443 lbf 9093.8 N·m6707.2 ft·lb 6714.6 N·m4952.5 ft·lb 4335.5 N·m3197.7 ft·lb
Class 5.8 — 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 0.44 kN99 lbf 0.15 N·m0.11 ft·lb 0.11 N·m0.08 ft·lb 0.07 N·m0.05 ft·lb
M2 M2×0.250.25 mm 0.69 kN154 lbf 0.30 N·m0.22 ft·lb 0.22 N·m0.16 ft·lb 0.14 N·m0.11 ft·lb
M2.5 M2.5×0.350.35 mm 1.04 kN233 lbf 0.56 N·m0.41 ft·lb 0.42 N·m0.31 ft·lb 0.27 N·m0.20 ft·lb
M3 M3×0.350.35 mm 1.57 kN353 lbf 0.97 N·m0.72 ft·lb 0.72 N·m0.53 ft·lb 0.47 N·m0.35 ft·lb
M3.5 M3.5×0.350.35 mm 2.21 kN497 lbf 1.54 N·m1.14 ft·lb 1.14 N·m0.84 ft·lb 0.74 N·m0.54 ft·lb
M4 M4×0.50.5 mm 2.74 kN616 lbf 2.24 N·m1.65 ft·lb 1.66 N·m1.23 ft·lb 1.09 N·m0.80 ft·lb
M5 M5×0.50.5 mm 4.51 kN1015 lbf 4.40 N·m3.24 ft·lb 3.25 N·m2.40 ft·lb 2.10 N·m1.55 ft·lb
M6 M6×0.750.75 mm 6.17 kN1387 lbf 7.40 N·m5.46 ft·lb 5.51 N·m4.06 ft·lb 3.61 N·m2.67 ft·lb
M7 M7×0.750.75 mm 8.72 kN1960 lbf 11.8 N·m8.73 ft·lb 8.77 N·m6.47 ft·lb 5.71 N·m4.21 ft·lb
M8 M8×11 mm 11.0 kN2465 lbf 17.5 N·m12.9 ft·lb 13.0 N·m9.60 ft·lb 8.54 N·m6.30 ft·lb
M10 M10×1.251.25 mm 17.1 kN3852 lbf 33.8 N·m24.9 ft·lb 25.2 N·m18.6 ft·lb 16.6 N·m12.2 ft·lb
M12 M12×1.51.5 mm 24.7 kN5547 lbf 57.6 N·m42.5 ft·lb 42.9 N·m31.7 ft·lb 28.3 N·m20.8 ft·lb
M14 M14×1.51.5 mm 34.9 kN7840 lbf 93.8 N·m69.2 ft·lb 69.5 N·m51.3 ft·lb 45.3 N·m33.4 ft·lb
M16 M16×1.51.5 mm 46.8 kN10528 lbf 142.5 N·m105.1 ft·lb 105.2 N·m77.6 ft·lb 67.9 N·m50.1 ft·lb
M18 M18×1.51.5 mm 60.5 kN13611 lbf 206.8 N·m152.5 ft·lb 152.2 N·m112.2 ft·lb 97.6 N·m72.0 ft·lb
M20 M20×1.51.5 mm 76.0 kN17090 lbf 286.6 N·m211.4 ft·lb 210.3 N·m155.1 ft·lb 134.1 N·m98.9 ft·lb
M22 M22×1.51.5 mm 93.3 kN20965 lbf 388.0 N·m286.1 ft·lb 284.1 N·m209.5 ft·lb 180.2 N·m132.9 ft·lb
M24 M24×22 mm 107.6 kN24198 lbf 487.6 N·m359.6 ft·lb 358.8 N·m264.7 ft·lb 230.1 N·m169.7 ft·lb
M27 M27×22 mm 138.8 kN31205 lbf 710.1 N·m523.7 ft·lb 521.0 N·m384.3 ft·lb 331.9 N·m244.8 ft·lb
M30 M30×22 mm 173.9 kN39102 lbf 985.3 N·m726.7 ft·lb 721.2 N·m531.9 ft·lb 457.1 N·m337.1 ft·lb
M33 M33×22 mm 213.0 kN47890 lbf 1315.9 N·m970.6 ft·lb 961.5 N·m709.1 ft·lb 607.0 N·m447.7 ft·lb
M36 M36×33 mm 242.2 kN54445 lbf 1654.4 N·m1220.2 ft·lb 1217.4 N·m897.9 ft·lb 780.5 N·m575.6 ft·lb
M39 M39×33 mm 287.9 kN64733 lbf 2125.2 N·m1567.5 ft·lb 1560.7 N·m1151.1 ft·lb 996.2 N·m734.8 ft·lb
M42 M42×33 mm 337.7 kN75912 lbf 2677.7 N·m1974.9 ft·lb 1963.0 N·m1447.8 ft·lb 1248.4 N·m920.7 ft·lb
M45 M45×33 mm 391.4 kN87980 lbf 3318.3 N·m2447.4 ft·lb 2429.0 N·m1791.5 ft·lb 1539.6 N·m1135.6 ft·lb
M48 M48×33 mm 449.0 kN100939 lbf 4070.1 N·m3002.0 ft·lb 2975.1 N·m2194.3 ft·lb 1880.0 N·m1386.6 ft·lb
M52 M52×44 mm 511.9 kN115082 lbf 5037.5 N·m3715.5 ft·lb 3699.5 N·m2728.6 ft·lb 2361.4 N·m1741.7 ft·lb
M56 M56×44 mm 600.3 kN134955 lbf 6354.4 N·m4686.8 ft·lb 4658.3 N·m3435.8 ft·lb 2962.2 N·m2184.8 ft·lb
M60 M60×44 mm 695.7 kN156410 lbf 7831.5 N·m5776.2 ft·lb 5733.2 N·m4228.6 ft·lb 3634.8 N·m2680.9 ft·lb
M64 M64×44 mm 798.2 kN179447 lbf 9520.7 N·m7022.1 ft·lb 6961.1 N·m5134.2 ft·lb 4401.5 N·m3246.4 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 5.8 bolt?

About 16.6 N·m (12.2 ft·lb) with dry threads and 12.5 N·m (9.20 ft·lb) with oiled threads (M8×1.25, 70% of yield, clamp force 10.3 kN).

What is the torque for an M10 5.8 bolt?

About 32.5 N·m (24.0 ft·lb) with dry threads and 24.4 N·m (18.0 ft·lb) with oiled threads (M10×1.5, 70% of yield, clamp force 16.2 kN).

What is the torque for an M12 5.8 bolt?

About 55.7 N·m (41.1 ft·lb) with dry threads and 41.8 N·m (30.8 ft·lb) with oiled threads (M12×1.75, 70% of yield, clamp force 23.6 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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