G2-1/2 thread: 75.18 mm × 11 TPI
Threads › G2-1/2
G2-1/2 is a BSP parallel (G) thread: 75.18 mm major diameter, 11 TPI (2.309 mm pitch), 55° form. Tap drill 72.5 mm.
| Standard | BSP parallel (G) |
|---|---|
| Major diameter | 75.184 mm (2.96″) |
| Pitch | 11 TPI (2.309 mm) |
| Thread angle | 55° |
| Minor diameter, bolt | 72.23 mm |
| Minor diameter, nut | 72.23 mm |
| Tap drill | 72.5 mm |
| Usual class | A bolt |
Minor diameters worked out from the basic profile: major Ø − 1.28065 × pitch.
Open G2-1/2 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.
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.