An M10 Class 10.9 bolt takes 72.2 N·m (53.3 ft·lbs) dry, or 54.2 N·m oiled. Every size from M3 to M64 is listed below — click a value for the full spec including all six surface conditions and fine-thread figures.
| Size | Pitch | N·m (dry) | ft·lbs (dry) | N·m (oiled) |
|---|---|---|---|---|
| M3 | 0.5 mm | 1.9 | 1.4 | 1.4 |
| M4 | 0.7 mm | 4.4 | 3.2 | 3.3 |
| M5 | 0.8 mm | 8.8 | 6.5 | 6.6 |
| M6 | 1.0 mm | 15.0 | 11.1 | 11.3 |
| M7 | 1.0 mm | 25.2 | 18.6 | 18.9 |
| M8 | 1.25 mm | 36.5 | 26.9 | 27.3 |
| M10 | 1.5 mm | 72.2 | 53.3 | 54.2 |
| M12 | 1.75 mm | 125.9 | 92.9 | 94.4 |
| M14 | 2.0 mm | 201.2 | 148.4 | 150.9 |
| M16 | 2.0 mm | 312.1 | 230.2 | 234.1 |
| M18 | 2.5 mm | 431.3 | 318.1 | 323.5 |
| M20 | 2.5 mm | 609.5 | 449.5 | 457.1 |
| M22 | 2.5 mm | 831.0 | 612.9 | 623.3 |
| M24 | 3.0 mm | 1053.3 | 776.9 | 790.0 |
| M27 | 3.0 mm | 1544.3 | 1139.0 | 1158.2 |
| M30 | 3.5 mm | 2093.8 | 1544.3 | 1570.4 |
| M33 | 3.5 mm | 2849.5 | 2101.7 | 2137.1 |
| M36 | 4.0 mm | 3660.5 | 2699.8 | 2745.4 |
| M39 | 4.0 mm | 4739.0 | 3495.3 | 3554.2 |
| M42 | 4.5 mm | 5861.2 | 4323.0 | 4395.9 |
| M45 | 4.5 mm | 7317.4 | 5397.0 | 5488.0 |
| M48 | 5.0 mm | 8803.8 | 6493.3 | 6602.8 |
| M52 | 5.0 mm | 11379.5 | 8393.1 | 8534.7 |
| M56 | 5.5 mm | 14153.2 | 10438.9 | 10614.9 |
| M64 | 6.0 mm | 21322.4 | 15726.6 | 15991.8 |
Dry/plain steel, K = 0.20 · Coarse thread · Clamp load 75% of proof load · Click any N·m value for full details
Identification: Head stamped 10.9. The two-part number is the strength code: 1,040 MPa tensile, 940 MPa yield.
Material: Alloy steel, quenched and tempered, proof stress 830 MPa per ISO 898-1.
Where it is used: High-stress joints where 8.8 is not enough — connecting rods, suspension, drivetrain and heavily loaded structural connections.
Worth knowing: Class 10.9 carries roughly 43% more clamp load than 8.8 at the same diameter, which is often cheaper than stepping up a bolt size.
Every figure comes from T = K × D × F, where K is the nut factor (0.20 dry, 0.15 oiled), D is nominal diameter in metres, and F is clamp load set at 75% of proof load. Proof stress and tensile stress area come from ISO 898-1.
These are engineering reference values for a standard hex bolt in a steel joint. Where a manufacturer publishes a specific figure, use theirs. Full methodology →
It depends on diameter. An M8 Class 10.9 takes 36.5 N·m (26.9 ft·lbs), an M10 takes 72.2 N·m (53.3 ft·lbs), and an M12 takes 125.9 N·m (92.9 ft·lbs) — all dry, plain steel, coarse thread. The full table covers M3 to M64.
The first number is one hundredth of the minimum tensile strength in MPa, and the second is ten times the ratio of yield to tensile strength. So 10.9 means 1,040 MPa tensile and a yield point at 90% of that — 940 MPa.
Alloy steel, quenched and tempered, with a minimum tensile strength of 1,040 MPa, yield strength of 940 MPa and proof stress of 830 MPa per ISO 898-1.
Yes. Oil lowers the nut factor from about 0.20 to 0.15, so the same clamp load needs roughly 25% less torque. An M10 Class 10.9 goes from 72.2 N·m dry to 54.2 N·m oiled — using the dry figure on an oiled bolt risks exceeding yield.