3/4-16 UNF thread: 19.05 mm × 16 TPI
Threads › 3/4-16 UNF
3/4-16 UNF is a UNF thread: 19.05 mm major diameter, 16 TPI (1.588 mm pitch), 60° form. Tap drill 17.5 mm.
| Standard | UNF |
|---|---|
| Major diameter | 19.05 mm (0.75″) |
| Pitch | 16 TPI (1.588 mm) |
| Thread angle | 60° |
| Minor diameter, bolt | 17.1 mm |
| Minor diameter, nut | 17.33 mm |
| Tap drill | 17.5 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 3/4-16 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
- 3/4-10 UNC10 TPI (2.54 mm pitch)
- 3/4 BSW10 TPI (2.54 mm pitch)
Close in size, won't mate
- 3/4-6 ACMEØ19.05 mm, 6 TPI
- M20Ø20 mm, 2.5 mm pitch
- M20×1.5Ø20 mm, 1.5 mm pitch
- M20×2Ø20 mm, 2 mm pitch
- Tr20×4Ø20 mm, 4 mm pitch
One size up or down
- 5/8-18 UNFØ15.88 mm (down)
- 7/8-14 UNFØ22.23 mm (up)
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.