7/8-14 UNF thread: 22.23 mm × 14 TPI
Threads › 7/8-14 UNF
7/8-14 UNF is a UNF thread: 22.23 mm major diameter, 14 TPI (1.814 mm pitch), 60° form.
| Standard | UNF |
|---|---|
| Major diameter | 22.225 mm (0.875″) |
| Pitch | 14 TPI (1.814 mm) |
| Thread angle | 60° |
| Minor diameter, bolt | 20 mm |
| Minor diameter, nut | 20.26 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 7/8-14 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
- 7/8-6 ACMEØ22.23 mm, 6 TPI
- M22Ø22 mm, 2.5 mm pitch
- M22×1.5Ø22 mm, 1.5 mm pitch
- Tr22×5Ø22 mm, 5 mm pitch
- G5/8Ø22.91 mm, 14 TPI
- 1/2-14 NPTØ21.34 mm, 14 TPI
One size up or down
- 3/4-16 UNFØ19.05 mm (down)
- 1-12 UNFØ25.4 mm (up)
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.