4.6 Bolt Torque Chart

Tightening torque and clamp force for Class 4.6 bolts from M1.6 to M64. For example, an M8 4.6 bolt needs about 9.96 N·m (7.35 ft·lb) with dry threads.

Low-carbon steel for light-duty, non-critical fasteners. Common for cheap hardware-store bolts and anchor rods.

Standard
Metric (ISO 898-1)
Yield strength used
240 MPa (35 ksi)
Tensile strength
400 MPa (58 ksi)
Sizes covered
M1.6 – M64
Class 4.6 — 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 0.21 kN48 lbf 0.08 N·m0.06 ft·lb 0.06 N·m0.04 ft·lb 0.04 N·m0.03 ft·lb
M2 M2×0.40.4 mm 0.35 kN78 lbf 0.16 N·m0.11 ft·lb 0.12 N·m0.09 ft·lb 0.08 N·m0.06 ft·lb
M2.5 M2.5×0.450.45 mm 0.57 kN128 lbf 0.31 N·m0.23 ft·lb 0.24 N·m0.17 ft·lb 0.16 N·m0.12 ft·lb
M3 M3×0.50.5 mm 0.85 kN190 lbf 0.54 N·m0.40 ft·lb 0.40 N·m0.30 ft·lb 0.27 N·m0.20 ft·lb
M3.5 M3.5×0.60.6 mm 1.14 kN256 lbf 0.82 N·m0.61 ft·lb 0.62 N·m0.46 ft·lb 0.42 N·m0.31 ft·lb
M4 M4×0.70.7 mm 1.47 kN332 lbf 1.23 N·m0.91 ft·lb 0.93 N·m0.69 ft·lb 0.63 N·m0.46 ft·lb
M5 M5×0.80.8 mm 2.38 kN536 lbf 2.40 N·m1.77 ft·lb 1.80 N·m1.33 ft·lb 1.21 N·m0.89 ft·lb
M6 M6×11 mm 3.38 kN760 lbf 4.14 N·m3.05 ft·lb 3.12 N·m2.30 ft·lb 2.10 N·m1.55 ft·lb
M7 M7×11 mm 4.85 kN1090 lbf 6.71 N·m4.95 ft·lb 5.02 N·m3.71 ft·lb 3.34 N·m2.46 ft·lb
M8 M8×1.251.25 mm 6.15 kN1383 lbf 9.96 N·m7.35 ft·lb 7.48 N·m5.52 ft·lb 5.00 N·m3.69 ft·lb
M10 M10×1.51.5 mm 9.74 kN2190 lbf 19.5 N·m14.4 ft·lb 14.6 N·m10.8 ft·lb 9.74 N·m7.19 ft·lb
M12 M12×1.751.75 mm 14.2 kN3183 lbf 33.4 N·m24.7 ft·lb 25.1 N·m18.5 ft·lb 16.7 N·m12.3 ft·lb
M14 M14×22 mm 19.4 kN4360 lbf 53.2 N·m39.2 ft·lb 39.8 N·m29.4 ft·lb 26.5 N·m19.5 ft·lb
M16 M16×22 mm 26.3 kN5917 lbf 81.5 N·m60.1 ft·lb 60.7 N·m44.8 ft·lb 40.0 N·m29.5 ft·lb
M18 M18×2.52.5 mm 32.3 kN7269 lbf 113.8 N·m84.0 ft·lb 85.2 N·m62.8 ft·lb 56.5 N·m41.7 ft·lb
M20 M20×2.52.5 mm 41.1 kN9245 lbf 159.3 N·m117.5 ft·lb 118.7 N·m87.6 ft·lb 78.1 N·m57.6 ft·lb
M22 M22×2.52.5 mm 51.0 kN11459 lbf 217.4 N·m160.3 ft·lb 161.4 N·m119.1 ft·lb 105.5 N·m77.8 ft·lb
M24 M24×33 mm 59.2 kN13313 lbf 274.5 N·m202.4 ft·lb 204.6 N·m150.9 ft·lb 134.7 N·m99.3 ft·lb
M27 M27×33 mm 77.2 kN17351 lbf 402.9 N·m297.2 ft·lb 299.0 N·m220.5 ft·lb 195.0 N·m143.8 ft·lb
M30 M30×3.53.5 mm 94.2 kN21172 lbf 548.3 N·m404.4 ft·lb 407.5 N·m300.6 ft·lb 266.7 N·m196.7 ft·lb
M33 M33×3.53.5 mm 116.5 kN26194 lbf 738.1 N·m544.4 ft·lb 546.9 N·m403.4 ft·lb 355.8 N·m262.4 ft·lb
M36 M36×44 mm 137.2 kN30846 lbf 951.7 N·m701.9 ft·lb 706.3 N·m520.9 ft·lb 460.8 N·m339.9 ft·lb
M39 M39×44 mm 163.9 kN36852 lbf 1227.0 N·m905.0 ft·lb 908.2 N·m669.9 ft·lb 589.5 N·m434.8 ft·lb
M42 M42×4.54.5 mm 188.3 kN42334 lbf 1522.8 N·m1123.2 ft·lb 1128.7 N·m832.5 ft·lb 734.6 N·m541.8 ft·lb
M45 M45×4.54.5 mm 219.4 kN49325 lbf 1894.8 N·m1397.5 ft·lb 1401.4 N·m1033.6 ft·lb 908.0 N·m669.7 ft·lb
M48 M48×55 mm 247.5 kN55638 lbf 2295.3 N·m1692.9 ft·lb 1699.5 N·m1253.5 ft·lb 1103.6 N·m814.0 ft·lb
M52 M52×55 mm 295.3 kN66390 lbf 2937.0 N·m2166.2 ft·lb 2169.8 N·m1600.3 ft·lb 1402.5 N·m1034.4 ft·lb
M56 M56×5.55.5 mm 341.0 kN76669 lbf 3663.6 N·m2702.1 ft·lb 2708.0 N·m1997.3 ft·lb 1752.5 N·m1292.6 ft·lb
M60 M60×5.55.5 mm 396.8 kN89208 lbf 4529.0 N·m3340.4 ft·lb 3341.6 N·m2464.6 ft·lb 2154.1 N·m1588.8 ft·lb
M64 M64×66 mm 449.6 kN101066 lbf 5456.3 N·m4024.3 ft·lb 4028.8 N·m2971.5 ft·lb 2601.3 N·m1918.6 ft·lb
Class 4.6 — 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 0.26 kN59 lbf 0.09 N·m0.07 ft·lb 0.07 N·m0.05 ft·lb 0.04 N·m0.03 ft·lb
M2 M2×0.250.25 mm 0.41 kN92 lbf 0.18 N·m0.13 ft·lb 0.13 N·m0.10 ft·lb 0.09 N·m0.06 ft·lb
M2.5 M2.5×0.350.35 mm 0.62 kN140 lbf 0.34 N·m0.25 ft·lb 0.25 N·m0.18 ft·lb 0.16 N·m0.12 ft·lb
M3 M3×0.350.35 mm 0.94 kN212 lbf 0.58 N·m0.43 ft·lb 0.43 N·m0.32 ft·lb 0.28 N·m0.21 ft·lb
M3.5 M3.5×0.350.35 mm 1.33 kN298 lbf 0.93 N·m0.68 ft·lb 0.68 N·m0.50 ft·lb 0.44 N·m0.33 ft·lb
M4 M4×0.50.5 mm 1.65 kN370 lbf 1.34 N·m0.99 ft·lb 1.00 N·m0.74 ft·lb 0.65 N·m0.48 ft·lb
M5 M5×0.50.5 mm 2.71 kN609 lbf 2.64 N·m1.95 ft·lb 1.95 N·m1.44 ft·lb 1.26 N·m0.93 ft·lb
M6 M6×0.750.75 mm 3.70 kN832 lbf 4.44 N·m3.27 ft·lb 3.30 N·m2.44 ft·lb 2.17 N·m1.60 ft·lb
M7 M7×0.750.75 mm 5.23 kN1176 lbf 7.10 N·m5.24 ft·lb 5.26 N·m3.88 ft·lb 3.42 N·m2.52 ft·lb
M8 M8×11 mm 6.58 kN1479 lbf 10.5 N·m7.73 ft·lb 7.81 N·m5.76 ft·lb 5.13 N·m3.78 ft·lb
M10 M10×1.251.25 mm 10.3 kN2311 lbf 20.3 N·m15.0 ft·lb 15.1 N·m11.1 ft·lb 9.93 N·m7.33 ft·lb
M12 M12×1.51.5 mm 14.8 kN3328 lbf 34.6 N·m25.5 ft·lb 25.8 N·m19.0 ft·lb 17.0 N·m12.5 ft·lb
M14 M14×1.51.5 mm 20.9 kN4704 lbf 56.3 N·m41.5 ft·lb 41.7 N·m30.8 ft·lb 27.2 N·m20.0 ft·lb
M16 M16×1.51.5 mm 28.1 kN6317 lbf 85.5 N·m63.1 ft·lb 63.1 N·m46.6 ft·lb 40.8 N·m30.1 ft·lb
M18 M18×1.51.5 mm 36.3 kN8167 lbf 124.1 N·m91.5 ft·lb 91.3 N·m67.3 ft·lb 58.5 N·m43.2 ft·lb
M20 M20×1.51.5 mm 45.6 kN10254 lbf 171.9 N·m126.8 ft·lb 126.2 N·m93.1 ft·lb 80.5 N·m59.3 ft·lb
M22 M22×1.51.5 mm 56.0 kN12579 lbf 232.8 N·m171.7 ft·lb 170.5 N·m125.7 ft·lb 108.1 N·m79.8 ft·lb
M24 M24×22 mm 64.6 kN14519 lbf 292.5 N·m215.8 ft·lb 215.3 N·m158.8 ft·lb 138.1 N·m101.8 ft·lb
M27 M27×22 mm 83.3 kN18723 lbf 426.1 N·m314.2 ft·lb 312.6 N·m230.6 ft·lb 199.1 N·m146.9 ft·lb
M30 M30×22 mm 104.4 kN23461 lbf 591.2 N·m436.0 ft·lb 432.7 N·m319.2 ft·lb 274.3 N·m202.3 ft·lb
M33 M33×22 mm 127.8 kN28734 lbf 789.6 N·m582.3 ft·lb 576.9 N·m425.5 ft·lb 364.2 N·m268.6 ft·lb
M36 M36×33 mm 145.3 kN32667 lbf 992.6 N·m732.1 ft·lb 730.5 N·m538.8 ft·lb 468.3 N·m345.4 ft·lb
M39 M39×33 mm 172.8 kN38840 lbf 1275.1 N·m940.5 ft·lb 936.4 N·m690.7 ft·lb 597.7 N·m440.9 ft·lb
M42 M42×33 mm 202.6 kN45547 lbf 1606.6 N·m1185.0 ft·lb 1177.8 N·m868.7 ft·lb 749.0 N·m552.4 ft·lb
M45 M45×33 mm 234.8 kN52788 lbf 1991.0 N·m1468.5 ft·lb 1457.4 N·m1074.9 ft·lb 923.8 N·m681.3 ft·lb
M48 M48×33 mm 269.4 kN60563 lbf 2442.1 N·m1801.2 ft·lb 1785.0 N·m1316.6 ft·lb 1128.0 N·m832.0 ft·lb
M52 M52×44 mm 307.1 kN69049 lbf 3022.5 N·m2229.3 ft·lb 2219.7 N·m1637.2 ft·lb 1416.9 N·m1045.0 ft·lb
M56 M56×44 mm 360.2 kN80973 lbf 3812.6 N·m2812.1 ft·lb 2795.0 N·m2061.5 ft·lb 1777.3 N·m1310.9 ft·lb
M60 M60×44 mm 417.4 kN93846 lbf 4698.9 N·m3465.7 ft·lb 3439.9 N·m2537.1 ft·lb 2180.9 N·m1608.5 ft·lb
M64 M64×44 mm 478.9 kN107668 lbf 5712.4 N·m4213.3 ft·lb 4176.6 N·m3080.5 ft·lb 2640.9 N·m1947.8 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 4.6 bolt?

About 9.96 N·m (7.35 ft·lb) with dry threads and 7.48 N·m (5.52 ft·lb) with oiled threads (M8×1.25, 70% of yield, clamp force 6.15 kN).

What is the torque for an M10 4.6 bolt?

About 19.5 N·m (14.4 ft·lb) with dry threads and 14.6 N·m (10.8 ft·lb) with oiled threads (M10×1.5, 70% of yield, clamp force 9.74 kN).

What is the torque for an M12 4.6 bolt?

About 33.4 N·m (24.7 ft·lb) with dry threads and 25.1 N·m (18.5 ft·lb) with oiled threads (M12×1.75, 70% of yield, clamp force 14.2 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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