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M24 bolt size
36 mm wrench
across-flats spanner / socket size for M24
M24 bolt — major structural and plant connections.
Full specification
| System | Metric coarse |
| Nominal diameter | 24 mm |
| Thread pitch | 3.0 mm |
| Wrench / spanner (across flats) | 36 mm |
| Tap drill | 21.0 mm |
| Clearance hole | 26 mm |
| Common grade / class | 8.8 |
| Typical torque | 710 Nm (524 ft·lb) |
| Closest other-system size | ~7/8 to 1 inch |
🔧 Torque unit converter
Pre-filled with the typical torque for M24 (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 M24
M24 is a major structural fastener for steelwork and large equipment.
Torque this size with hydraulic or large impact tools, never by hand.
Frequently asked questions
- What size wrench or spanner fits M24?
- M24 bolt uses a 36 mm wrench or spanner, measured across the flats of the hex head.
- What is the torque for M24?
- A typical tightening torque for M24 bolt in 8.8 on dry threads is about 710 Nm (524 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M24 use?
- M24 bolt has a thread pitch of 3.0 mm and uses a 21.0 mm tap drill, with a 26 mm clearance hole.