R3/4 thread: 26.44 mm × 14 TPI
Threads › R3/4
R3/4 is a BSPT taper (R / Rc) thread: 26.44 mm major diameter, 14 TPI (1.814 mm pitch), 55° form. Tap drill 23.75 mm. Taper thread: the Ø changes along the length, measure near the start.
| Standard | BSPT taper (R / Rc) |
|---|---|
| Major diameter | 26.441 mm (1.041″) |
| Pitch | 14 TPI (1.814 mm) |
| Thread angle | 55° |
| Tap drill | 23.75 mm |
Open R3/4 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
- G3/4Ø26.44 mm, 14 TPI
- 3/4-14 NPTØ26.67 mm, 14 TPI
- Tr26×5Ø26 mm, 5 mm pitch
- M27Ø27 mm, 3 mm pitch
- M27×2Ø27 mm, 2 mm pitch
One size up or down
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.