BSPP Parallel Pipe Thread (G) · ISO 228-1 / DIN 259
G 5" Thread: Pitch, Tap Drill & Dimensions
G 5" is a BSPP Parallel Pipe Thread (G) (ISO 228-1 / DIN 259) size, with a major diameter of 138.430 mm, 11 threads per inch (2.309 mm pitch). The tap drill is 135.473 mm.
| Major Diameter (inch) | 5.450 |
|---|---|
| Major Diameter (mm) | 138.430 |
| Minor Diameter Nut (mm) | 137.332 |
| Tapping Drill Size (mm) | 135.473 |
| TPI | 11 |
| Pitch (mm) | 2.309 |
| Flank angle | 55° |
Common questions
What size drill do I use to tap G 5"?
Use a 135.473 drill. This is the standard tap drill for G 5"; for hard materials or deep threads a slightly larger drill reduces tapping torque.
What is the pitch of G 5"?
The pitch of G 5" is 2.309, meaning the thread advances that distance in one full turn.
Where can I find other BSPP Parallel Pipe Thread (G) sizes?
The full BSPP Parallel Pipe Thread (G) table, with every size and a live filter, is on its standard page, and the Thread Finder searches all 73 standards at once.
Reference values; computed values use the ISO basic profile. Verify against the current standard before production use.