Threaded Ring Gauges for Pipe Threads
Confirm that external pipe threads are sized within tolerance. Manufactured with precision, these gauges meet tight thread tolerances themselves.
Use gauges with NPSM and BSPP threads in pairs for go/no-go tests. Go gauges check the maximum external thread size, and no-go gauges check the minimum. If the threads you’re testing thread into the go gauge but not the no-go gauge, they’re within tolerance.
Go/No-Go Gauges—Class X
Go Gauges | No-Go Gauges | |||||||
|---|---|---|---|---|---|---|---|---|
Pipe Size | Hardness | Material | Pitch Dia. Tolerance | Each | Pitch Dia. Tolerance | Each | ||
BSPP Threads | ||||||||
| 1/8 | Rockwell C55 | Tool Steel | 0" to 0.0003" | 00000000 | 0000000 | -0.0003" to 0" | 00000000 | 0000000 |
| 1/4 | Rockwell C55 | Tool Steel | 0" to 0.0003" | 00000000 | 000000 | -0.0003" to 0" | 00000000 | 000000 |
| 3/8 | Rockwell C55 | Tool Steel | 0" to 0.0003" | 00000000 | 000000 | -0.0003" to 0" | 00000000 | 000000 |
| 1/2 | Rockwell C55 | Tool Steel | 0" to 0.0003" | 00000000 | 000000 | -0.0003" to 0" | 00000000 | 000000 |
| 3/4 | Rockwell C55 | Tool Steel | 0" to 0.0003" | 00000000 | 000000 | -0.0003" to 0" | 00000000 | 000000 |
| 1 | Rockwell C55 | Tool Steel | 0" to 0.0003" | 00000000 | 000000 | -0.0003" to 0" | 00000000 | 000000 |
| 1 1/4 | Rockwell C55 | Tool Steel | 0" to 0.0003" | 00000000 | 000000 | -0.0003" to 0" | 00000000 | 000000 |