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5/16 inch set screw size
5/32 in hex key
Allen / internal hex key size for 5/16 grub
5/16 inch set screw — heavier couplings and collars.
Full specification
| System | Imperial (Alloy) |
| Nominal diameter | 5/16 in (7.94 mm) |
| Thread pitch | 18 TPI |
| Hex key (Allen) | 5/32 in |
| Tap drill | F (6.5 mm) |
| Clearance hole | n/a (threaded) |
| Common grade / class | Alloy |
| Typical torque | 16 Nm (11.8 ft·lb) |
| Closest other-system size | ~M8 |
🔧 Torque unit converter
Pre-filled with the typical torque for 5/16 grub (Alloy, dry). Edit any field to convert.
⚠️ Torque values here are general references for Alloy 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 5/16 grub
The 5/16-18 set screw holds heavier imperial couplings and collars.
A 5/32 in hex key fits 5/16-18 set screws.
Frequently asked questions
- What size Allen / hex key fits 5/16 grub?
- 5/16 inch set screw uses a 5/32 in hex (Allen) key with an internal hex drive.
- What is the torque for 5/16 grub?
- A typical tightening torque for 5/16 inch set screw in Alloy on dry threads is about 16 Nm (11.8 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does 5/16 grub use?
- 5/16 inch set screw has a thread pitch of 18 TPI and uses a F (6.5 mm) tap drill, with a n/a (threaded) clearance hole.