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M10 bolt size
17 mm wrench
across-flats spanner / socket size for M10
M10 bolt — automotive suspension and heavy brackets.
Full specification
| System | Metric coarse |
| Nominal diameter | 10 mm |
| Thread pitch | 1.5 mm |
| Wrench / spanner (across flats) | 17 mm |
| Tap drill | 8.5 mm |
| Clearance hole | 11 mm |
| Common grade / class | 8.8 |
| Typical torque | 49 Nm (36 ft·lb) |
| Closest other-system size | ~3/8 inch |
🔧 Torque unit converter
Pre-filled with the typical torque for M10 (8.8, dry). Edit any field to convert.
⚠️ Torque values here are general references for 8.8 on clean, dry threads. Lubrication, coatings, and the joint material change the figure significantly. For structural, automotive, or safety-critical work, always use the torque specified by the manufacturer or engineer.
About M10
M10 appears throughout automotive suspension, engine mounts and heavy brackets.
Some M10 bolts use a 16 mm head instead of 17 mm — check before reaching for a socket.
Frequently asked questions
- What size wrench or spanner fits M10?
- M10 bolt uses a 17 mm wrench or spanner, measured across the flats of the hex head.
- What is the torque for M10?
- A typical tightening torque for M10 bolt in 8.8 on dry threads is about 49 Nm (36 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M10 use?
- M10 bolt has a thread pitch of 1.5 mm and uses a 8.5 mm tap drill, with a 11 mm clearance hole.