M10 Bolt Torque
An M10 8.8 bolt with a coarse M10×1.5 thread needs about 52.0 N·m (38.3 ft·lb) when dry and 39.0 N·m (28.7 ft·lb) when oiled, tightened to 70% of yield (clamp force 26.0 kN).
| Grade | Clamp forcepreload | Dryμ 0.15 | Oiledμ 0.11 | PTFE / moly pasteμ 0.06 |
|---|---|---|---|---|
| 4.6 | 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 |
| 4.8 | 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 |
| 5.6 | 12.2 kN2738 lbf | 24.4 N·m18.0 ft·lb | 18.3 N·m13.5 ft·lb | 12.2 N·m8.98 ft·lb |
| 5.8 | 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 |
| 6.8 | 19.5 kN4380 lbf | 39.0 N·m28.7 ft·lb | 29.2 N·m21.6 ft·lb | 19.5 N·m14.4 ft·lb |
| 8.8 | 26.0 kN5840 lbf | 52.0 N·m38.3 ft·lb | 39.0 N·m28.7 ft·lb | 26.0 N·m19.2 ft·lb |
| 9.8 | 29.2 kN6570 lbf | 58.5 N·m43.1 ft·lb | 43.8 N·m32.3 ft·lb | 29.2 N·m21.6 ft·lb |
| 10.9 | 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 |
| 12.9 | 43.8 kN9856 lbf | 87.7 N·m64.7 ft·lb | 65.8 N·m48.5 ft·lb | 43.8 N·m32.3 ft·lb |
| A2-70 | 18.3 kN4107 lbf | 36.5 N·m26.9 ft·lb | 27.4 N·m20.2 ft·lb | 18.3 N·m13.5 ft·lb |
| A4-70 | 18.3 kN4107 lbf | 36.5 N·m26.9 ft·lb | 27.4 N·m20.2 ft·lb | 18.3 N·m13.5 ft·lb |
| A4-80 | 24.4 kN5475 lbf | 48.7 N·m35.9 ft·lb | 36.5 N·m26.9 ft·lb | 24.4 N·m18.0 ft·lb |
| Grade | Clamp forcepreload | Dryμ 0.15 | Oiledμ 0.11 | PTFE / moly pasteμ 0.06 |
|---|---|---|---|---|
| 4.6 | 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 |
| 4.8 | 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 |
| 5.6 | 12.9 kN2889 lbf | 25.4 N·m18.7 ft·lb | 18.9 N·m13.9 ft·lb | 12.4 N·m9.16 ft·lb |
| 5.8 | 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 |
| 6.8 | 20.6 kN4623 lbf | 40.6 N·m29.9 ft·lb | 30.2 N·m22.3 ft·lb | 19.9 N·m14.7 ft·lb |
| 8.8 | 27.4 kN6164 lbf | 54.1 N·m39.9 ft·lb | 40.3 N·m29.7 ft·lb | 26.5 N·m19.5 ft·lb |
| 9.8 | 30.8 kN6934 lbf | 60.9 N·m44.9 ft·lb | 45.3 N·m33.4 ft·lb | 29.8 N·m22.0 ft·lb |
| 10.9 | 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 |
| 12.9 | 46.3 kN10401 lbf | 91.3 N·m67.4 ft·lb | 68.0 N·m50.2 ft·lb | 44.7 N·m33.0 ft·lb |
| A2-70 | 19.3 kN4334 lbf | 38.1 N·m28.1 ft·lb | 28.3 N·m20.9 ft·lb | 18.6 N·m13.7 ft·lb |
| A4-70 | 19.3 kN4334 lbf | 38.1 N·m28.1 ft·lb | 28.3 N·m20.9 ft·lb | 18.6 N·m13.7 ft·lb |
| A4-80 | 25.7 kN5778 lbf | 50.7 N·m37.4 ft·lb | 37.8 N·m27.9 ft·lb | 24.8 N·m18.3 ft·lb |
Torque for M10 hex head bolts and nuts, standard ISO/ASME heads on steel with a 11.0 mm clearance hole. Friction μ applies to both the threads and the bearing face. Always follow the manufacturer's value where one exists.
M10 thread and dimensions
- Coarse thread
- M10×1.5 — pitch 1.5 mm
- Fine thread
- M10×1.25 — pitch 1.25 mm
- Tensile stress area Aₛ
- 58.0 mm² (coarse), 61.2 mm² (fine)
- Pitch diameter d₂
- 9.026 mm
- Tap drill
- 8.5 mm (coarse), 8.8 mm (fine)
- Wrench size (hex head)
- 16 mm (DIN: 17 mm)
- Clearance hole
- 11.0 mm
How the M10 torque is calculated
Preload is 70% of the bolt's yield strength times its tensile stress area. Torque then follows the ISO 16047 / VDI 2230 formula, which splits it into thread pitch, thread friction and friction under the head:
F = 70% × 640 MPa × 58.0 mm² = 26.0 kN
T = F × (0.16·P + 0.58·μ·d₂ + μ·Dₖₘ/2)
T = 26.0 kN × (0.16·1.5 + 0.58·0.15·9.03 + 0.15·13.50/2) mm = 52.0 N·m
Here d₂ is the pitch diameter and Dₖₘ the effective bearing diameter of the head (13.50 mm). Change the grade, lubrication or preload in the calculator below.
Frequently asked questions
What is the torque for an M10 8.8 bolt?
About 52.0 N·m (38.3 ft·lb) with dry threads, 39.0 N·m (28.7 ft·lb) with oiled threads and 26.0 N·m (19.2 ft·lb) with PTFE or moly paste, for a coarse M10×1.5 thread tightened to 70% of yield. The resulting clamp force is 26.0 kN.
What is the torque for an M10 10.9 bolt?
About 73.1 N·m (53.9 ft·lb) with dry threads, 54.8 N·m (40.4 ft·lb) with oiled threads and 36.5 N·m (26.9 ft·lb) with PTFE or moly paste, for a coarse M10×1.5 thread tightened to 70% of yield. The resulting clamp force is 36.5 kN.
What size wrench fits an M10 bolt?
A standard M10 hex head bolt or nut takes a 16 mm (DIN: 17 mm) wrench or socket.
What drill size do I need to tap M10?
Use a 8.5 mm drill for M10×1.5 and 8.8 mm for M10×1.25.