Threaded Plug Gauges
These have a go gauge on one end and a no-go gauge on the other end. They allow you to inspect internal threads on parts. 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.
Inch
| Thread Size  | Thread Type | Pitch Dia. Tolerance | Hardness | Material | Choose a For Thread Fit | Each | |
Class X | |||||||
|---|---|---|---|---|---|---|---|
| 0-80 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 0000000 | |
| 1-72 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 2-56 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 3-48 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 4-40 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 4-48 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 5-40 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 6-32 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 6-40 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 8-32 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 8-36 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 10-24 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 10-32 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 12-24 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 1/4"-20 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 00000 | |
| 1/4"-28 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 00000 | |
| 5/16"-18 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 00000 | |
| 5/16"-24 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 00000 | |
| 3/8"-16 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 00000 | |
| 3/8"-24 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 00000 | |
| 7/16"-14 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 00000 | |
| 7/16"-20 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 00000 | |
| 1/2"-13 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 1/2"-20 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 9/16"-18 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 5/8"-11 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 5/8"-18 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 3/4"-10 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 3/4"-16 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 7/8"-9 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 7/8"-14 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 1"-8 | UNC | -0.0004" to 0.0004" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 1"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 1 1/8"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 1 1/4"-7 | UNC | -0.0004" to 0.0004" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
| 1 1/4"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 | |
Metric
| Thread Size | Pitch | Pitch Dia. Tolerance | Hardness | Material | For Thread Fit | Each | |
Class X | |||||||
|---|---|---|---|---|---|---|---|
| M1.6 | 0.35mm | -0.005" to 0.005" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 0000000 |
| M2 | 0.4mm | -0.005" to 0.005" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M2.5 | 0.45mm | -0.005" to 0.005" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M3 | 0.5mm | -0.005" to 0.005" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M3.5 | 0.6mm | -0.005" to 0.005" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M4 | 0.7mm | -0.005" to 0.005" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M5 | 0.8mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M6 | 1mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M8 | 1mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M8 | 1.25mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M10 | 1.25mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M10 | 1.5mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M12 | 1mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M12 | 1.25mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M12 | 1.5mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M12 | 1.75mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M14 | 1.5mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M16 | 1.5mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M16 | 2mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
| M18 | 1.5mm | -0.008" to 0.008" | Rockwell C70 | Chrome-Plated Tool Steel | Class 6H | 000000000 | 000000 |
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.
Inch
| Thread Size | Thread Type | Pitch Dia. Tolerance | Hardness | Material | Each | |
Class 2B | ||||||
|---|---|---|---|---|---|---|
Class X | ||||||
| 0-80 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 0000000 |
| 1-64 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1-72 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 2-56 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 2-64 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 3-48 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 4-40 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 4-48 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 5-40 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 6-32 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 6-40 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 8-32 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 8-36 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 10-24 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 10-32 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 12-24 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 12-28 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1/4"-20 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1/4"-28 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 5/16"-18 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 5/16"-24 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 3/8"-16 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 3/8"-24 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 7/16"-14 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 7/16"-20 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1/2"-13 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1/2"-20 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 9/16"-18 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 5/8"-11 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 5/8"-18 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 3/4"-10 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 3/4"-16 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 7/8"-9 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 7/8"-14 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1"-8 | UNC | -0.0004" to 0.0004" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1 1/8"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1 1/4"-7 | UNC | -0.0004" to 0.0004" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1 1/4"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1 1/2"-6 | UNC | -0.0004" to 0.0004" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1 1/2"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
Class 3B | ||||||
Class X | ||||||
| 0-80 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1-64 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1-72 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 2-56 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 2-64 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 3-48 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 4-40 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 4-48 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 5-40 | UNC | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 6-32 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 6-40 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 8-32 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 8-36 | UNF | -0.0002" to 0.0002" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 10-24 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 10-32 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 12-24 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 12-28 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1/4"-20 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1/4"-28 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 5/16"-18 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 5/16"-24 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 3/8"-16 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 3/8"-24 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 7/16"-14 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 7/16"-20 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1/2"-13 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1/2"-20 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 9/16"-18 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 5/8"-11 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 5/8"-18 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 3/4"-10 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 3/4"-16 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 7/8"-9 | UNC | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 7/8"-14 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1"-8 | UNC | -0.0004" to 0.0004" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1 1/8"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1 1/4"-7 | UNC | -0.0004" to 0.0004" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1 1/4"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1 1/2"-6 | UNC | -0.0004" to 0.0004" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
| 1 1/2"-12 | UNF | -0.0003" to 0.0003" | Rockwell C70 | Chrome-Plated Tool Steel | 00000000 | 000000 |
Metric
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
A notch on the handle indicates when the internal NPT 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 | 0000000 | 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 |
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 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 |