Home › Nuts & Wrench Sizes › M12 nut
M12 nut size
19 mm wrench
across-flats spanner / socket size for M12 nut
M12 nut — pairs with M12 bolts.
Full specification
| System | Metric |
| Nominal diameter | 12 mm thread |
| Thread pitch | 1.75 mm |
| Wrench / spanner (across flats) | 19 mm |
| Tap drill | n/a |
| Clearance hole | n/a |
| Common grade / class | matches bolt |
| Typical torque | 85 Nm (63 ft·lb) |
| Closest other-system size | ~1/2 in nut |
🔧 Torque unit converter
Pre-filled with the typical torque for M12 nut (matches bolt, dry). Edit any field to convert.
⚠️ Torque values here are general references for matches bolt 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 M12 nut
An M12 hex nut takes a 19 mm wrench across the flats.
For structural joints, a double-nut or nyloc keeps M12 connections tight.
Frequently asked questions
- What size wrench or spanner fits M12 nut?
- M12 nut uses a 19 mm wrench or spanner, measured across the flats of the hex head.
- What is the torque for M12 nut?
- A typical tightening torque for M12 nut in matches bolt on dry threads is about 85 Nm (63 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M12 nut use?
- M12 nut has a thread pitch of 1.75 mm and uses a n/a tap drill, with a n/a clearance hole.