1/2-10 ACME thread: 12.7 mm × 10 TPI
Threads › 1/2-10 ACME
1/2-10 ACME is an Acme thread: 12.7 mm major diameter, 10 TPI (2.54 mm pitch), 29° form.
| Standard | Acme |
|---|---|
| Major diameter | 12.7 mm (0.5″) |
| Pitch | 10 TPI (2.54 mm) |
| Thread angle | 29° |
| Minor diameter, bolt | 9.65 mm |
| Minor diameter, nut | 9.65 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 1/2-10 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
- 1/2-13 UNCØ12.7 mm, 13 TPI
- 1/2-20 UNFØ12.7 mm, 20 TPI
- 1/2 BSWØ12.7 mm, 12 TPI
- G1/4Ø13.16 mm, 19 TPI
- R1/4Ø13.16 mm, 19 TPI
- M12Ø12 mm, 1.75 mm pitch
One size up or down
- 7/16-12 ACMEØ11.11 mm (down)
- 5/8-8 ACMEØ15.88 mm (up)
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.