Certification Certification |
---|
|
Thread Size Thread Size |
---|
RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
---|
|
Material Material |
---|
|
DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
---|
REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
---|
|
Hardness Hardness |
---|
|
Finish Finish |
---|
|
Surface Smoothness (RMS) Surface Smoothness (RMS) |
---|
|
Threaded Plug Gauges with Calibration Certificate

These gauges come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy. They allow you to inspect internal threads on parts. All have a go gauge on one end and a no-go gauge on the other end. A taperlock handle lets you quickly replace worn gauges.
Check the minimum internal thread size with the go gauge end, and check the maximum internal thread size with the no-go gauge end. A part is within tolerance if it’s easy to thread the go gauge into the part but difficult to thread the no-go gauge more than two turns.
Threads have different classes of fit. Thread fit designates the tightness or looseness of mating threads. For example, inch threads with a 3B fit have tighter tolerances than threads with a 2B fit.
For technical drawings and 3-D models, click on a part number.
Class 2B | Class 3B | |||||||
---|---|---|---|---|---|---|---|---|
Thread Size | Thread Type | Pitch Dia. Tolerance | Hardness | Material | Each | Each | ||
Class X | ||||||||
0-80 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 0000000 | 00000000 | 0000000 |
1-64 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1-72 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
2-56 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
2-64 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3-48 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
4-40 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
4-48 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5-40 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
6-32 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
6-40 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
8-32 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
8-36 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
10-24 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
10-32 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
12-24 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
12-28 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1/4"-20 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1/4"-28 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5/16"-18 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5/16"-24 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3/8"-16 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3/8"-24 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
7/16"-14 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
7/16"-20 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1/2"-13 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1/2"-20 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
9/16"-18 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5/8"-11 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5/8"-18 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3/4"-10 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3/4"-16 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
7/8"-9 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
7/8"-14 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1"-8 | UNC | -0.0004" to 0.0004" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1"-14 | UNS | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/8"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/4"-7 | UNC | -0.0004" to 0.0004" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/4"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/2"-6 | UNC | -0.0004" to 0.0004" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/2"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
Class 6H | ||||||
---|---|---|---|---|---|---|
Thread Size | Pitch | Pitch Dia. Tolerance | Hardness | Material | Each | |
Class X | ||||||
M1.6 | 0.35mm | -0.005" to 0.005" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 0000000 |
M2 | 0.4mm | -0.005" to 0.005" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M2.5 | 0.45mm | -0.005" to 0.005" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M3 | 0.5mm | -0.005" to 0.005" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M3.5 | 0.6mm | -0.005" to 0.005" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M4 | 0.7mm | -0.005" to 0.005" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M5 | 0.8mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M6 | 1mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M7 | 1mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M8 | 1mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M8 | 1.25mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M10 | 1.25mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M10 | 1.5mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M12 | 1mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M12 | 1.25mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M12 | 1.5mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M12 | 1.75mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M14 | 1.5mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M16 | 1.5mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M16 | 2mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
M18 | 1.5mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
Threaded Plug Gauges for NPT Pipe Threads with Calibration Certificate

Ensure the accuracy of internal NPT pipe thread measurements—these gauges come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy. A notch on the handle indicates when the threads you’re checking are in tolerance. Gauges have a taperlock handle for quickly replacing worn gauges.
For technical drawings and 3-D models, click on a part number.
Pipe Size | Pitch Diameter Tolerance | Hardness | Material | Each | |
Class X | |||||
---|---|---|---|---|---|
1/16 | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 0000000 |
1/8 | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
1/4 | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
3/8 | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
1/2 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
3/4 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
1 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
1 1/4 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
1 1/2 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
2 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
2 1/2 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
3 | -0.0005" to 0.0005" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
4 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
Threaded Ring Gauges with Calibration Certificate

A certificate of calibration traceable to NIST states that these gauges have passed a test for accuracy. They’re for checking a part’s external threads to ensure they fall within tolerance.
A part is within tolerance if it’s easy to thread a go gauge onto the part but difficult to thread a no-go gauge more than two turns.
Go gauges check the maximum external thread size.
No-go gauges check the minimum external thread size.
Threads have different classes of fit. Thread fit designates the tightness or looseness of the mating threads. For example, inch threads with a 3A fit have tighter tolerances than threads with a 2A fit.
For technical drawings and 3-D models, click on a part number.
Class 2A | Class 3A | |||||||
---|---|---|---|---|---|---|---|---|
Thread Size | Thread Type | Pitch Dia. Tolerance | Hardness | Material | Each | Each | ||
Go Gauge | ||||||||
Class X | ||||||||
0-80 | UNF | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 0000000 | 00000000 | 0000000 |
1-64 | UNC | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1-72 | UNF | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
2-56 | UNC | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
2-64 | UNF | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3-48 | UNC | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
4-40 | UNC | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
4-48 | UNF | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5-40 | UNC | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
6-32 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
6-40 | UNF | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
8-32 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
8-36 | UNF | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
10-24 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
10-32 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
12-24 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
12-28 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1/4"-20 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1/4"-28 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5/16"-18 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5/16"-24 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3/8"-16 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3/8"-24 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
7/16"-14 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
7/16"-20 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1/2"-13 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1/2"-20 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
9/16"-18 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5/8"-11 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5/8"-18 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3/4"-10 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3/4"-16 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
7/8"-9 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
7/8"-14 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1"-8 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1"-12 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1"-14 | UNS | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/8"-12 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/4"-7 | UNC | -0.0004" to 0.0004" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/4"-12 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/2"-12 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/2"-6 | UNC | -0.0004" to 0.0004" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
No-Go Gauge | ||||||||
Class X | ||||||||
0-80 | UNF | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1-64 | UNC | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1-72 | UNF | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
2-56 | UNC | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
2-64 | UNF | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3-48 | UNC | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
4-40 | UNC | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
4-48 | UNF | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5-40 | UNC | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
6-32 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
6-40 | UNF | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
8-32 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
8-36 | UNF | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
10-24 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
10-32 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
12-24 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
12-28 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1/4"-20 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1/4"-28 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5/16"-18 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5/16"-24 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3/8"-16 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3/8"-24 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
7/16"-14 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
7/16"-20 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1/2"-13 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1/2"-20 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
9/16"-18 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5/8"-11 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
5/8"-18 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3/4"-10 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
3/4"-16 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
7/8"-9 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
7/8"-14 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1"-8 | UNC | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1"-12 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1"-14 | UNS | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/8"-12 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/4"-7 | UNC | -0.0004" to 0.0004" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/4"-12 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/2"-12 | UNF | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
1 1/2"-6 | UNC | -0.0004" to 0.0004" | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
Go Gauge | No-Go Gauge | ||||||||
---|---|---|---|---|---|---|---|---|---|
Class 6g | Class 6g | ||||||||
Thread Size | Thread Type | Pitch | Pitch Dia. Tolerance | Hardness | Material | Each | Each | ||
Class X | |||||||||
M1.6 | Metric | 0.35 mm | -0.005mm to 0.005mm | Rockwell C60 | Tool Steel | 00000000 | 0000000 | 00000000 | 0000000 |
M2 | Metric | 0.4 mm | -0.005mm to 0.005mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M2.5 | Metric | 0.45 mm | -0.005mm to 0.005mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M3 | Metric | 0.5 mm | -0.005mm to 0.005mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M3.5 | Metric | 0.6 mm | -0.005mm to 0.005mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M4 | Metric | 0.7 mm | -0.005mm to 0.005mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M5 | Metric | 0.8 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M6 | Metric | 1 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M7 | Metric | 1 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M8 | Metric | 1 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M8 | Metric | 1.25 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M10 | Metric | 1.25 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M10 | Metric | 1.5 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M12 | Metric | 1 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M12 | Metric | 1.25 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M12 | Metric | 1.5 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M12 | Metric | 1.75 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M14 | Metric | 1.5 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M16 | Metric | 1.5 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M16 | Metric | 2 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
M18 | Metric | 1.5 mm | -0.008mm to 0.008mm | Rockwell C60 | Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
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 | |||||
---|---|---|---|---|---|
1/16 | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 0000000 |
1/8 | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
1/4 | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
3/8 | -0.0002" to 0.0002" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
1/2 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
3/4 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
1 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
1 1/4 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
1 1/2 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
2 | -0.0003" to 0.0003" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
2 1/2 | -0.0005" to 0.0005" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
3 | -0.0005" to 0.0005" | Rockwell C60 | Tool Steel | 00000000 | 000000 |
4 | -0.0005" to 0.0005" | Rockwell C60 | Tool Steel | 00000000 | 00000000 |
Master Ring Gauges

Set inside micrometers, dial bore gauges, and other precision tools. These gauges come with 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.
Choose a Size | Increment | Gauge Tolerance | Surface Smoothness (RMS), microinch | Hardness | Material | Each | |
Class Z | |||||||
---|---|---|---|---|---|---|---|
0.1501" to 0.2400" | 0.0001" | -0.00005" to 0.00005" | 8 | Rockwell C60 | Tool Steel | 0000000 | 0000000 |
0.2401" to 0.3650" | 0.0001" | -0.00005" to 0.00005" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
0.3650" to 0.5100" | 0.0001" | -0.00005" to 0.00005" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
0.5101" to 0.8250" | 0.0001" | -0.00005" to 0.00005" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
0.8251" to 1.1350" | 0.0001" | -0.00006" to 0.00006" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
1.1351" to 1.5100" | 0.0001" | -0.00006" to 0.00006" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
1.5101" to 2.0100" | 0.0001" | -0.00008" to 0.00008" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
2.0101" to 2.5100" | 0.0001" | -0.00008" to 0.00008" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
Class X | |||||||
0.1501" to 0.2400" | 0.0001" | -0.00002" to 0.00002" | 4 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
0.2401" to 0.3650" | 0.0001" | -0.00002" to 0.00002" | 4 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
0.3650" to 0.5100" | 0.0001" | -0.00002" to 0.00002" | 4 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
0.5101" to 0.8250" | 0.0001" | -0.00002" to 0.00002" | 4 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
0.8251" to 1.1350" | 0.0001" | -0.00003" to 0.00003" | 4 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
1.1351" to 1.5100" | 0.0001" | -0.00003" to 0.00003" | 4 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
1.5101" to 2.0100" | 0.0001" | -0.00004" to 0.00004" | 4 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
2.0101" to 2.5100" | 0.0001" | -0.00004" to 0.00004" | 4 | Rockwell C60 | Tool Steel | 0000000 | 000000 |