5/16-14 ACME thread: 7.94 mm × 14 TPI
Threads › 5/16-14 ACME
5/16-14 ACME is an Acme thread: 7.94 mm major diameter, 14 TPI (1.814 mm pitch), 29° form.
| Standard | Acme |
|---|---|
| Major diameter | 7.938 mm (0.313″) |
| Pitch | 14 TPI (1.814 mm) |
| Thread angle | 29° |
| Minor diameter, bolt | 5.62 mm |
| Minor diameter, nut | 5.62 mm |
| Tap drill | Not listed. Check your tap maker's chart. |
Minor diameters worked out from the basic profile: major Ø − pitch − 0.508 mm.
Open 5/16-14 ACME in BenchsmithAdd to order list
Measure it
Bolt: Measure across the crests of the bolt with the caliper jaws. Worn bolts read 0.1 to 0.3 under.
Nut or tapped hole: Measure across the tops of the threads inside the nut or hole with the inside jaws. That is the minor Ø. Worn or oversize holes read a little over.
Close in size, won't mate
- 5/16-18 UNCØ7.94 mm, 18 TPI
- 5/16-24 UNFØ7.94 mm, 24 TPI
- 5/16 BSWØ7.94 mm, 18 TPI
- M8Ø8 mm, 1.25 mm pitch
- M8×1Ø8 mm, 1 mm pitch
- Tr8×1.5Ø8 mm, 1.5 mm pitch
One size up or down
- 1/4-16 ACMEØ6.35 mm (down)
- 3/8-12 ACMEØ9.52 mm (up)
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.