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M8x1.0 bolt size
13 mm wrench
across-flats spanner / socket size for M8×1.0
M8x1.0 bolt — automotive and precision adjustment.
Full specification
| System | Metric fine |
| Nominal diameter | 8 mm |
| Thread pitch | 1.0 mm (fine) |
| Wrench / spanner (across flats) | 13 mm |
| Tap drill | 7.0 mm |
| Clearance hole | 9 mm |
| Common grade / class | 8.8 |
| Typical torque | 27 Nm (19.9 ft·lb) |
| Closest other-system size | M8 coarse |
🔧 Torque unit converter
Pre-filled with the typical torque for M8×1.0 (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 M8×1.0
M8x1.0 fine thread gives finer adjustment and better vibration resistance than coarse M8.
Fine and coarse M8 share a 13 mm head but the threads do not interchange.
Frequently asked questions
- What size wrench or spanner fits M8×1.0?
- M8x1.0 bolt uses a 13 mm wrench or spanner, measured across the flats of the hex head.
- What is the torque for M8×1.0?
- A typical tightening torque for M8x1.0 bolt in 8.8 on dry threads is about 27 Nm (19.9 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M8×1.0 use?
- M8x1.0 bolt has a thread pitch of 1.0 mm (fine) and uses a 7.0 mm tap drill, with a 9 mm clearance hole.