Pipe Thread Ring Gauge (JIS method)
| Type of thread |
No. of Threads
(threads/inch) |
Type of gauge |
Class |
| PF1/8 |
28 |
GR/IR/WR |
A
B |
| PF1/4 |
19 |
| PF3/8 |
19 |
| PF1/2 |
14 |
| PF5/8 |
14 |
| PF3/4 |
14 |
| PF7/8 |
14 |
| PF1 |
11 |
| PF1 1/8 |
11 |
| PF1 1/4 |
11 |
| PF1 1/2 |
11 |
| PF1 3/4 |
11 |
| PF2 |
11 |
Pipe Thread Ring Gauge (ISO method)
| Type of thread |
No. of Threads
(threads/inch) |
Type of gauge |
Class |
| G1/16 |
28 |
GR/NR |
A
B |
| G1/8 |
28 |
| G1/4 |
19 |
| G3/8 |
19 |
| G1/2 |
14 |
| G3/4 |
14 |
| G7/8 |
14 |
| G1 |
11 |
| G1 1/8 |
11 |
| G1 1/4 |
11 |
| G1 1/2 |
11 |
| G1 3/4 |
11 |
| G2 |
11 |