#8-32 UNC thread: 4.17 mm × 32 TPI
Threads › #8-32 UNC
#8-32 UNC is a UNC thread: 4.17 mm major diameter, 32 TPI (0.794 mm pitch), 60° form.
| Standard | UNC |
|---|---|
| Major diameter | 4.166 mm (0.164″) |
| Pitch | 32 TPI (0.794 mm) |
| Thread angle | 60° |
| Minor diameter, bolt | 3.19 mm |
| Minor diameter, nut | 3.31 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 #8-32 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
- #8-36 UNF36 TPI (0.706 mm pitch)
Close in size, won't mate
- M4Ø4 mm, 0.7 mm pitch
- 3/16 BSWØ4.76 mm, 24 TPI
- #6-40 UNFØ3.51 mm, 40 TPI
- #10-32 UNFØ4.83 mm, 32 TPI
- M5Ø5 mm, 0.8 mm pitch
- 1/8 BSWØ3.18 mm, 40 TPI
One size up or down
- #6-32 UNCØ3.51 mm (down)
- #10-24 UNCØ4.83 mm (up)
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.