1-1/8-7 UNC thread: 28.58 mm × 7 TPI
Threads › 1-1/8-7 UNC
1-1/8-7 UNC is a UNC thread: 28.58 mm major diameter, 7 TPI (3.629 mm pitch), 60° form.
| Standard | UNC |
|---|---|
| Major diameter | 28.575 mm (1.125″) |
| Pitch | 7 TPI (3.629 mm) |
| Thread angle | 60° |
| Minor diameter, bolt | 24.12 mm |
| Minor diameter, nut | 24.65 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 1-1/8-7 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
- 1-1/8-12 UNF12 TPI (2.117 mm pitch)
Close in size, won't mate
- Tr28×5Ø28 mm, 5 mm pitch
One size up or down
- 1-8 UNCØ25.4 mm (down)
- 1-1/4-7 UNCØ31.75 mm (up)
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.