# M10 bolt torque

Tighten an M10 × 1.5 class 8.8 bolt to 50 N·m (37 ft-lb) with dry threads, or 38 N·m when lubricated. Class 10.9 takes 72 N·m and class 12.9 takes 84 N·m.

## M10 × 1.5 torque by property class

| Property class | Dry torque (K 0.20) | Lubricated (K 0.15) | Clamp load | Proof load |
|---|---|---|---|---|
| Class 8.8 | 50 N·m (37 ft-lb) | 38 N·m (28 ft-lb) | 25.2 kN | 33.6 kN |
| Class 10.9 | 72 N·m (53 ft-lb) | 54 N·m (40 ft-lb) | 36.1 kN | 48.1 kN |
| Class 12.9 | 84 N·m (62 ft-lb) | 63 N·m (47 ft-lb) | 42.2 kN | 56.2 kN |

Clamp load = 75 % of proof load. Method: T = K × F × d.

## M10 bolt data

- Thread: M10 × 1.5 coarse
- Tensile stress area: 58.0 mm²
- Wrench: 16 mm (ISO 4014/4017), 17 mm (DIN 931/933)
- Socket head cap screw hex key: 8 mm
- Tap drill: 8.5 mm
- Clearance hole (ISO 273): 10.5 close, 11 normal, 12 loose (mm)

## Method

Proof stress from ISO 898-1 (580 MPa for 8.8 at this size, 830 MPa for 10.9, 970 MPa for 12.9) × tensile stress area As = π/4 × (d − 0.9382 p)². Target clamp load F = 75 % of proof load. T = K × F × d with K = 0.20 dry, 0.15 lubricated.

## FAQ

**What is the torque for an M10 8.8 bolt?**
About 50 N·m (37 ft-lb) with dry threads and about 38 N·m lubricated, based on 75 % of proof load.

**What is the torque for an M10 10.9 bolt?**
About 72 N·m (53 ft-lb) dry and 54 N·m lubricated.

**What is the torque for an M10 12.9 bolt?**
About 84 N·m (62 ft-lb) dry and 63 N·m lubricated.

**What size wrench fits an M10 bolt?**
16 mm for ISO hex bolts and 17 mm for older DIN hex bolts. An M10 socket head cap screw takes a 8 mm hex key.

**What drill size do I need to tap M10?**
Use a 8.5 mm drill for M10 × 1.5 coarse thread.

Source page: https://machinistcharts.com/bolt-torque/m10/
Updated: 2026-10-05
Publisher: MachinistCharts (https://machinistcharts.com)