1-12 UNF thread: 25.4 mm × 12 TPI
Threads › 1-12 UNF
1-12 UNF is a UNF thread: 25.4 mm major diameter, 12 TPI (2.117 mm pitch), 60° form.
| Standard | UNF |
|---|---|
| Major diameter | 25.4 mm (1″) |
| Pitch | 12 TPI (2.117 mm) |
| Thread angle | 60° |
| Minor diameter, bolt | 22.8 mm |
| Minor diameter, nut | 23.11 mm |
| Tap drill | Not listed. Check your tap maker's chart. |
| Usual class | 2A bolt, 2B nut |
Minor diameters worked out from the basic profile: major Ø − 1.22687 × pitch (bolt) and − 1.08253 × pitch (nut).
Open 1-12 UNF 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.
Same diameter, other pitch
Close in size, won't mate
One size up or down
- 7/8-14 UNFØ22.23 mm (down)
- 1-1/8-12 UNFØ28.58 mm (up)
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.