Home › Metric Bolts › M30
M30 bolt size
46 mm wrench
across-flats spanner / socket size for M30
M30 bolt — very heavy structural anchoring.
Full specification
| System | Metric coarse |
| Nominal diameter | 30 mm |
| Thread pitch | 3.5 mm |
| Wrench / spanner (across flats) | 46 mm |
| Tap drill | 26.5 mm |
| Clearance hole | 33 mm |
| Common grade / class | 8.8 |
| Typical torque | 1450 Nm (1069 ft·lb) |
| Closest other-system size | ~1-1/8 inch |
🔧 Torque unit converter
Pre-filled with the typical torque for M30 (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 M30
M30 is a very heavy structural size used for large baseplates and anchors.
Joints this size are normally tensioned with calibrated hydraulic equipment.
Frequently asked questions
- What size wrench or spanner fits M30?
- M30 bolt uses a 46 mm wrench or spanner, measured across the flats of the hex head.
- What is the torque for M30?
- A typical tightening torque for M30 bolt in 8.8 on dry threads is about 1450 Nm (1069 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M30 use?
- M30 bolt has a thread pitch of 3.5 mm and uses a 26.5 mm tap drill, with a 33 mm clearance hole.