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1/4 inch nut size
7/16 in wrench
across-flats spanner / socket size for 1/4 in nut
1/4 inch nut — pairs with 1/4-20 bolts.
Full specification
| System | Imperial |
| Nominal diameter | 1/4 in thread |
| Thread pitch | 20 TPI |
| Wrench / spanner (across flats) | 7/16 in |
| Tap drill | n/a |
| Clearance hole | n/a |
| Common grade / class | matches bolt |
| Typical torque | 15 Nm (11.1 ft·lb) |
| Closest other-system size | ~M6 nut |
🔧 Torque unit converter
Pre-filled with the typical torque for 1/4 in 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 1/4 in nut
A 1/4-20 hex nut takes a 7/16 in wrench across the flats.
Keep imperial and metric nuts separated — 1/4 in and M6 cross-thread and jam.
Frequently asked questions
- What size wrench or spanner fits 1/4 in nut?
- 1/4 inch nut uses a 7/16 in wrench or spanner, measured across the flats of the hex head.
- What is the torque for 1/4 in nut?
- A typical tightening torque for 1/4 inch nut in matches bolt on dry threads is about 15 Nm (11.1 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does 1/4 in nut use?
- 1/4 inch nut has a thread pitch of 20 TPI and uses a n/a tap drill, with a n/a clearance hole.