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M6 bolt size
10 mm wrench
across-flats spanner / socket size for M6
M6 bolt — general machinery and brackets.
Full specification
| System | Metric coarse |
| Nominal diameter | 6 mm |
| Thread pitch | 1.0 mm |
| Wrench / spanner (across flats) | 10 mm |
| Tap drill | 5.0 mm |
| Clearance hole | 6.6 mm |
| Common grade / class | 8.8 |
| Typical torque | 10 Nm (7.4 ft·lb) |
| Closest other-system size | ~1/4 inch |
🔧 Torque unit converter
Pre-filled with the typical torque for M6 (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 M6
M6 is a general-purpose size for machinery guards, brackets and mid-size assemblies.
M6 takes a 10 mm wrench — a frequent point of confusion with the similar-looking 1/4 inch.
Frequently asked questions
- What size wrench or spanner fits M6?
- M6 bolt uses a 10 mm wrench or spanner, measured across the flats of the hex head.
- What is the torque for M6?
- A typical tightening torque for M6 bolt in 8.8 on dry threads is about 10 Nm (7.4 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M6 use?
- M6 bolt has a thread pitch of 1.0 mm and uses a 5.0 mm tap drill, with a 6.6 mm clearance hole.