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7/16-20 UNF bolt size
5/8 in wrench
across-flats spanner / socket size for 7/16-20
7/16-20 UNF bolt — automotive and hydraulics.
Full specification
| System | Imperial UNF |
| Nominal diameter | 7/16 in (11.11 mm) |
| Thread pitch | 20 TPI (fine) |
| Wrench / spanner (across flats) | 5/8 in |
| Tap drill | 25/64 in |
| Clearance hole | 29/64 in |
| Common grade / class | Grade 5 |
| Typical torque | 85 Nm (63 ft·lb) |
| Closest other-system size | ~7/16-14 coarse |
🔧 Torque unit converter
Pre-filled with the typical torque for 7/16-20 (Grade 5, dry). Edit any field to convert.
⚠️ Torque values here are general references for Grade 5 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 7/16-20
7/16-20 fine thread is common in hydraulics and automotive joints.
Clean fine threads thoroughly before torquing for an accurate reading.
Frequently asked questions
- What size wrench or spanner fits 7/16-20?
- 7/16-20 UNF bolt uses a 5/8 in wrench or spanner, measured across the flats of the hex head.
- What is the torque for 7/16-20?
- A typical tightening torque for 7/16-20 UNF bolt in Grade 5 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 7/16-20 use?
- 7/16-20 UNF bolt has a thread pitch of 20 TPI (fine) and uses a 25/64 in tap drill, with a 29/64 in clearance hole.