7/8-9 UNC thread: 22.23 mm × 9 TPI
Threads › 7/8-9 UNC
7/8-9 UNC is a UNC thread: 22.23 mm major diameter, 9 TPI (2.822 mm pitch), 60° form. Tap drill 19.5 mm.
| Standard | UNC |
|---|---|
| Major diameter | 22.225 mm (0.875″) |
| Pitch | 9 TPI (2.822 mm) |
| Thread angle | 60° |
| Minor diameter, bolt | 18.76 mm |
| Minor diameter, nut | 19.17 mm |
| Tap drill | 19.5 mm |
| 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 7/8-9 UNC 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
- 7/8-14 UNF14 TPI (1.814 mm pitch)
- 7/8 BSW9 TPI (2.822 mm 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
- 3/4-10 UNCØ19.05 mm (down)
- 1-8 UNCØ25.4 mm (up)
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.