Threaded Ring Gauges for NPT Pipe Threads with Calibration Certificate
To ensure accuracy of external NPT pipe thread measurements, these gauges include a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy.
For technical drawings and 3-D models, click on a part number.
Pipe Size | Pitch Diameter Tolerance | Hardness | Material | Each | |
Class X | |||||
|---|---|---|---|---|---|
| 1/2 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 0000000 |
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 NPT, NPTF, and BSPT threads on their own for tests—if it takes no more than one turn for the gauge to sit flush against the end of the threads, they’re within tolerance.
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.