4.8 Bolt Torque Chart

Tightening torque and clamp force for Class 4.8 bolts from M1.6 to M64. For example, an M8 4.8 bolt needs about 13.3 N·m (9.80 ft·lb) with dry threads.

Low-carbon steel, cold-formed. Typical for general-purpose screws and nuts without load requirements.

Standard
Metric (ISO 898-1)
Yield strength used
320 MPa (46 ksi)
Tensile strength
400 MPa (58 ksi)
Sizes covered
M1.6 – M64
Class 4.8 — 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 0.28 kN64 lbf 0.10 N·m0.07 ft·lb 0.08 N·m0.06 ft·lb 0.05 N·m0.04 ft·lb
M2 M2×0.40.4 mm 0.46 kN104 lbf 0.21 N·m0.15 ft·lb 0.16 N·m0.12 ft·lb 0.11 N·m0.08 ft·lb
M2.5 M2.5×0.450.45 mm 0.76 kN171 lbf 0.42 N·m0.31 ft·lb 0.31 N·m0.23 ft·lb 0.21 N·m0.16 ft·lb
M3 M3×0.50.5 mm 1.13 kN253 lbf 0.72 N·m0.53 ft·lb 0.54 N·m0.40 ft·lb 0.36 N·m0.27 ft·lb
M3.5 M3.5×0.60.6 mm 1.52 kN341 lbf 1.10 N·m0.81 ft·lb 0.83 N·m0.61 ft·lb 0.56 N·m0.41 ft·lb
M4 M4×0.70.7 mm 1.97 kN442 lbf 1.64 N·m1.21 ft·lb 1.24 N·m0.91 ft·lb 0.84 N·m0.62 ft·lb
M5 M5×0.80.8 mm 3.18 kN714 lbf 3.19 N·m2.36 ft·lb 2.40 N·m1.77 ft·lb 1.61 N·m1.19 ft·lb
M6 M6×11 mm 4.51 kN1013 lbf 5.52 N·m4.07 ft·lb 4.16 N·m3.07 ft·lb 2.79 N·m2.06 ft·lb
M7 M7×11 mm 6.46 kN1453 lbf 8.95 N·m6.60 ft·lb 6.70 N·m4.94 ft·lb 4.45 N·m3.28 ft·lb
M8 M8×1.251.25 mm 8.20 kN1843 lbf 13.3 N·m9.80 ft·lb 9.98 N·m7.36 ft·lb 6.67 N·m4.92 ft·lb
M10 M10×1.51.5 mm 13.0 kN2920 lbf 26.0 N·m19.2 ft·lb 19.5 N·m14.4 ft·lb 13.0 N·m9.58 ft·lb
M12 M12×1.751.75 mm 18.9 kN4243 lbf 44.6 N·m32.9 ft·lb 33.4 N·m24.6 ft·lb 22.3 N·m16.4 ft·lb
M14 M14×22 mm 25.9 kN5813 lbf 70.9 N·m52.3 ft·lb 53.1 N·m39.2 ft·lb 35.3 N·m26.0 ft·lb
M16 M16×22 mm 35.1 kN7889 lbf 108.6 N·m80.1 ft·lb 81.0 N·m59.7 ft·lb 53.3 N·m39.3 ft·lb
M18 M18×2.52.5 mm 43.1 kN9692 lbf 151.8 N·m111.9 ft·lb 113.6 N·m83.8 ft·lb 75.3 N·m55.6 ft·lb
M20 M20×2.52.5 mm 54.8 kN12327 lbf 212.4 N·m156.7 ft·lb 158.3 N·m116.8 ft·lb 104.2 N·m76.9 ft·lb
M22 M22×2.52.5 mm 68.0 kN15278 lbf 289.8 N·m213.8 ft·lb 215.2 N·m158.7 ft·lb 140.6 N·m103.7 ft·lb
M24 M24×33 mm 79.0 kN17751 lbf 365.9 N·m269.9 ft·lb 272.7 N·m201.2 ft·lb 179.6 N·m132.4 ft·lb
M27 M27×33 mm 102.9 kN23134 lbf 537.2 N·m396.2 ft·lb 398.6 N·m294.0 ft·lb 260.0 N·m191.8 ft·lb
M30 M30×3.53.5 mm 125.6 kN28230 lbf 731.1 N·m539.2 ft·lb 543.4 N·m400.8 ft·lb 355.6 N·m262.3 ft·lb
M33 M33×3.53.5 mm 155.4 kN34925 lbf 984.1 N·m725.8 ft·lb 729.2 N·m537.9 ft·lb 474.4 N·m349.9 ft·lb
M36 M36×44 mm 182.9 kN41128 lbf 1268.9 N·m935.9 ft·lb 941.7 N·m694.5 ft·lb 614.5 N·m453.2 ft·lb
M39 M39×44 mm 218.6 kN49136 lbf 1636.0 N·m1206.7 ft·lb 1211.0 N·m893.2 ft·lb 785.9 N·m579.7 ft·lb
M42 M42×4.54.5 mm 251.1 kN56446 lbf 2030.5 N·m1497.6 ft·lb 1505.0 N·m1110.0 ft·lb 979.5 N·m722.4 ft·lb
M45 M45×4.54.5 mm 292.5 kN65767 lbf 2526.4 N·m1863.4 ft·lb 1868.5 N·m1378.1 ft·lb 1210.6 N·m892.9 ft·lb
M48 M48×55 mm 330.0 kN74184 lbf 3060.4 N·m2257.2 ft·lb 2265.9 N·m1671.3 ft·lb 1471.5 N·m1085.3 ft·lb
M52 M52×55 mm 393.8 kN88520 lbf 3916.0 N·m2888.3 ft·lb 2893.0 N·m2133.8 ft·lb 1870.0 N·m1379.2 ft·lb
M56 M56×5.55.5 mm 454.7 kN102226 lbf 4884.7 N·m3602.8 ft·lb 3610.7 N·m2663.1 ft·lb 2336.7 N·m1723.4 ft·lb
M60 M60×5.55.5 mm 529.1 kN118945 lbf 6038.7 N·m4453.9 ft·lb 4455.4 N·m3286.2 ft·lb 2872.2 N·m2118.4 ft·lb
M64 M64×66 mm 599.4 kN134754 lbf 7275.0 N·m5365.8 ft·lb 5371.7 N·m3962.0 ft·lb 3468.4 N·m2558.2 ft·lb
Class 4.8 — 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 0.35 kN79 lbf 0.12 N·m0.09 ft·lb 0.09 N·m0.07 ft·lb 0.06 N·m0.04 ft·lb
M2 M2×0.250.25 mm 0.55 kN123 lbf 0.24 N·m0.17 ft·lb 0.18 N·m0.13 ft·lb 0.11 N·m0.08 ft·lb
M2.5 M2.5×0.350.35 mm 0.83 kN187 lbf 0.45 N·m0.33 ft·lb 0.33 N·m0.25 ft·lb 0.22 N·m0.16 ft·lb
M3 M3×0.350.35 mm 1.26 kN282 lbf 0.78 N·m0.57 ft·lb 0.58 N·m0.43 ft·lb 0.38 N·m0.28 ft·lb
M3.5 M3.5×0.350.35 mm 1.77 kN398 lbf 1.24 N·m0.91 ft·lb 0.91 N·m0.67 ft·lb 0.59 N·m0.44 ft·lb
M4 M4×0.50.5 mm 2.19 kN493 lbf 1.79 N·m1.32 ft·lb 1.33 N·m0.98 ft·lb 0.87 N·m0.64 ft·lb
M5 M5×0.50.5 mm 3.61 kN812 lbf 3.52 N·m2.59 ft·lb 2.60 N·m1.92 ft·lb 1.68 N·m1.24 ft·lb
M6 M6×0.750.75 mm 4.94 kN1109 lbf 5.92 N·m4.36 ft·lb 4.40 N·m3.25 ft·lb 2.89 N·m2.13 ft·lb
M7 M7×0.750.75 mm 6.97 kN1568 lbf 9.47 N·m6.98 ft·lb 7.02 N·m5.18 ft·lb 4.56 N·m3.37 ft·lb
M8 M8×11 mm 8.77 kN1972 lbf 14.0 N·m10.3 ft·lb 10.4 N·m7.68 ft·lb 6.84 N·m5.04 ft·lb
M10 M10×1.251.25 mm 13.7 kN3082 lbf 27.1 N·m20.0 ft·lb 20.2 N·m14.9 ft·lb 13.2 N·m9.77 ft·lb
M12 M12×1.51.5 mm 19.7 kN4438 lbf 46.1 N·m34.0 ft·lb 34.4 N·m25.3 ft·lb 22.6 N·m16.7 ft·lb
M14 M14×1.51.5 mm 27.9 kN6272 lbf 75.0 N·m55.3 ft·lb 55.6 N·m41.0 ft·lb 36.2 N·m26.7 ft·lb
M16 M16×1.51.5 mm 37.5 kN8422 lbf 114.0 N·m84.1 ft·lb 84.2 N·m62.1 ft·lb 54.3 N·m40.1 ft·lb
M18 M18×1.51.5 mm 48.4 kN10889 lbf 165.4 N·m122.0 ft·lb 121.7 N·m89.8 ft·lb 78.0 N·m57.6 ft·lb
M20 M20×1.51.5 mm 60.8 kN13672 lbf 229.3 N·m169.1 ft·lb 168.3 N·m124.1 ft·lb 107.3 N·m79.1 ft·lb
M22 M22×1.51.5 mm 74.6 kN16772 lbf 310.4 N·m228.9 ft·lb 227.3 N·m167.6 ft·lb 144.2 N·m106.4 ft·lb
M24 M24×22 mm 86.1 kN19358 lbf 390.1 N·m287.7 ft·lb 287.1 N·m211.7 ft·lb 184.1 N·m135.8 ft·lb
M27 M27×22 mm 111.0 kN24964 lbf 568.1 N·m419.0 ft·lb 416.8 N·m307.4 ft·lb 265.5 N·m195.8 ft·lb
M30 M30×22 mm 139.1 kN31282 lbf 788.3 N·m581.4 ft·lb 577.0 N·m425.6 ft·lb 365.7 N·m269.7 ft·lb
M33 M33×22 mm 170.4 kN38312 lbf 1052.7 N·m776.5 ft·lb 769.2 N·m567.3 ft·lb 485.6 N·m358.1 ft·lb
M36 M36×33 mm 193.7 kN43556 lbf 1323.5 N·m976.2 ft·lb 973.9 N·m718.3 ft·lb 624.4 N·m460.5 ft·lb
M39 M39×33 mm 230.4 kN51787 lbf 1700.2 N·m1254.0 ft·lb 1248.6 N·m920.9 ft·lb 797.0 N·m587.8 ft·lb
M42 M42×33 mm 270.1 kN60730 lbf 2142.1 N·m1580.0 ft·lb 1570.4 N·m1158.3 ft·lb 998.7 N·m736.6 ft·lb
M45 M45×33 mm 313.1 kN70384 lbf 2654.6 N·m1958.0 ft·lb 1943.2 N·m1433.2 ft·lb 1231.7 N·m908.5 ft·lb
M48 M48×33 mm 359.2 kN80751 lbf 3256.1 N·m2401.6 ft·lb 2380.0 N·m1755.4 ft·lb 1504.0 N·m1109.3 ft·lb
M52 M52×44 mm 409.5 kN92065 lbf 4030.0 N·m2972.4 ft·lb 2959.6 N·m2182.9 ft·lb 1889.2 N·m1393.4 ft·lb
M56 M56×44 mm 480.2 kN107964 lbf 5083.5 N·m3749.4 ft·lb 3726.6 N·m2748.6 ft·lb 2369.8 N·m1747.9 ft·lb
M60 M60×44 mm 556.6 kN125128 lbf 6265.2 N·m4621.0 ft·lb 4586.5 N·m3382.8 ft·lb 2907.8 N·m2144.7 ft·lb
M64 M64×44 mm 638.6 kN143557 lbf 7616.6 N·m5617.7 ft·lb 5568.9 N·m4107.4 ft·lb 3521.2 N·m2597.1 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 4.8 bolt?

About 13.3 N·m (9.80 ft·lb) with dry threads and 9.98 N·m (7.36 ft·lb) with oiled threads (M8×1.25, 70% of yield, clamp force 8.20 kN).

What is the torque for an M10 4.8 bolt?

About 26.0 N·m (19.2 ft·lb) with dry threads and 19.5 N·m (14.4 ft·lb) with oiled threads (M10×1.5, 70% of yield, clamp force 13.0 kN).

What is the torque for an M12 4.8 bolt?

About 44.6 N·m (32.9 ft·lb) with dry threads and 33.4 N·m (24.6 ft·lb) with oiled threads (M12×1.75, 70% of yield, clamp force 18.9 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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