1/8-27 NPT thread: 10.29 mm × 27 TPI
Threads › 1/8-27 NPT
1/8-27 NPT is an NPT taper thread: 10.29 mm pipe OD, 27 TPI (0.941 mm pitch), 60° form. Tap drill 8.6 mm. Taper thread: the Ø changes along the length, measure near the start.
| Standard | NPT taper |
|---|---|
| Pipe OD | 10.287 mm (0.405″) |
| Pitch | 27 TPI (0.941 mm) |
| Thread angle | 60° |
| Tap drill | 8.6 mm |
Open 1/8-27 NPT 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.
Close in size, won't mate
- M10Ø10 mm, 1.5 mm pitch
- M10×1.25Ø10 mm, 1.25 mm pitch
- M10×1Ø10 mm, 1 mm pitch
- Tr10×2Ø10 mm, 2 mm pitch
- G1/8Ø9.73 mm, 28 TPI
- R1/8Ø9.73 mm, 28 TPI
One size up or down
- 1/4-18 NPTØ13.72 mm (up)
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.