9/16-18 UNF thread: 14.29 mm × 18 TPI
Threads › 9/16-18 UNF
9/16-18 UNF is a UNF thread: 14.29 mm major diameter, 18 TPI (1.411 mm pitch), 60° form.
| Standard | UNF |
|---|---|
| Major diameter | 14.288 mm (0.563″) |
| Pitch | 18 TPI (1.411 mm) |
| Thread angle | 60° |
| Minor diameter, bolt | 12.56 mm |
| Minor diameter, nut | 12.76 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 9/16-18 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
- 9/16-12 UNC12 TPI (2.117 mm pitch)
- 9/16 BSW12 TPI (2.117 mm pitch)
Close in size, won't mate
- M14Ø14 mm, 2 mm pitch
- M14×1.5Ø14 mm, 1.5 mm pitch
- Tr14×3Ø14 mm, 3 mm pitch
- 1/4-18 NPTØ13.72 mm, 18 TPI
One size up or down
- 1/2-20 UNFØ12.7 mm (down)
- 5/8-18 UNFØ15.88 mm (up)
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.