Thread Identifier Sets

Set includes calipers and gauges to identify external and internal threads.
Container | |||||||
---|---|---|---|---|---|---|---|
For Use With | For Thread Type | For Thread Location | Type | Material | Includes | Each | |
Inch, Metric | |||||||
Steel | |||||||
Screws, Bolts, Threaded Rods, Nuts, Pipe | NPT, UNC, UNF, BSPT, BSPP, Metric | External/Internal | Folding Case | Plastic | Caliper, Instruction Book, Two Steel Angle Gauges, Two Steel Gauges | 000000 | 000000 |
Threaded Plug Gauges with Handle for Pipe Threads

Verify whether pipe fitting threads fall within tolerance. These gauges are attached to a handle, giving you a solid gripping point to thread and unthread them quickly. All are precisely manufactured to tight thread tolerances. If the gauges wear down, you can install new ones (not included) on the taperlock handle.
Use gauges with NPSM and BSPP threads for go/no-go tests. The end with a go gauge checks the minimum internal thread size, and the end with a no-go gauge checks the maximum. Your fitting is within tolerance if it’s easy to thread in the go gauge but difficult to thread the no-go gauge more than two turns.
Gauges with a calibration certificate traceable to NIST were calibrated in a lab. The certificate, sometimes called a test report or long-form certificate, details the tested measurements.
For technical drawings and 3-D models, click on a part number.
Gauges | Gauges with Calibration Certificate Traceable to NIST | |||||||
---|---|---|---|---|---|---|---|---|
Pipe Size | Pitch Dia. Tolerance | Hardness | Material | Features | Each | Each | ||
BSPP | ||||||||
1/8 | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | Taperlock Handle | 0000000 | 0000000 | 00000000 | 0000000 |
1/4 | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | Taperlock Handle | 0000000 | 000000 | 00000000 | 000000 |
3/8 | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | Taperlock Handle | 0000000 | 000000 | 00000000 | 000000 |
1/2 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | Taperlock Handle | 0000000 | 000000 | 00000000 | 000000 |
3/4 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | Taperlock Handle | 0000000 | 000000 | 00000000 | 000000 |
1 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | Taperlock Handle | 000000 | 000000 | 00000000 | 000000 |
1 1/4 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | Taperlock Handle | 0000000 | 000000 | 00000000 | 000000 |
Threaded Ring Gauges for Pipe Threads with Calibration Certificate

These gauges come with a certificate that’s traceable to NIST, confirming they were calibrated in a lab. The certificate, sometimes called a test report or a long-form certificate, includes the tested measurements. Use these gauges to verify whether external pipe threads are within tolerance.
Use gauges with 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.
For technical drawings and 3-D models, click on a part number.
Pipe Size | Thread Type | Hardness | Material | Pitch Dia. Tolerance | Each | |
Go Gauges | ||||||
---|---|---|---|---|---|---|
BSPP Threads | ||||||
1/8 | BSPP | Rockwell C60 | Tool Steel | -0.0003" to 0" | 0000000 | 0000000 |
1/4 | BSPP | Rockwell C60 | Tool Steel | -0.0003" to 0" | 0000000 | 000000 |
3/8 | BSPP | Rockwell C60 | Tool Steel | -0.0003" to 0" | 0000000 | 000000 |
1/2 | BSPP | Rockwell C60 | Tool Steel | -0.0003" to 0" | 0000000 | 000000 |
3/4 | BSPP | Rockwell C60 | Tool Steel | -0.0003" to 0" | 0000000 | 000000 |
1 | BSPP | Rockwell C60 | Tool Steel | -0.0003" to 0" | 0000000 | 000000 |
1 1/4 | BSPP | Rockwell C60 | Tool Steel | -0.0003" to 0" | 0000000 | 000000 |
No-Go Gauges | ||||||
BSPP Threads | ||||||
1/8 | BSPP | Rockwell C60 | Tool Steel | 0" to 0.0003" | 0000000 | 000000 |
1/4 | BSPP | Rockwell C60 | Tool Steel | 0" to 0.0003" | 0000000 | 000000 |
3/8 | BSPP | Rockwell C60 | Tool Steel | 0" to 0.0003" | 0000000 | 000000 |
1/2 | BSPP | Rockwell C60 | Tool Steel | 0" to 0.0003" | 0000000 | 000000 |
3/4 | BSPP | Rockwell C60 | Tool Steel | 0" to 0.0003" | 0000000 | 000000 |
1 | BSPP | Rockwell C60 | Tool Steel | 0" to 0.0003" | 0000000 | 000000 |
1 1/4 | BSPP | Rockwell C60 | Tool Steel | 0" to 0.0003" | 0000000 | 000000 |
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.
For technical drawings and 3-D models, click on a part number.
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 |