Thread Size Thread Size |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Hardness Hardness |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Maximum Size Maximum Size |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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Surface Smoothness (RMS) Surface Smoothness (RMS) |
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Minimum Size Minimum Size |
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Plug Gauges with Handle
Take go and no-go measurements with the same tool. These gauges have a go gauge on one end, a no-go gauge on the other end, and a handle with bushings. They are used for precision go/no-go measuring of hole sizes and depths, checking hole location and distance, and setting micrometers. All come with a certificate of accuracy traceable to NIST.
Check the minimum hole diameter with the go gauge end, and check the maximum hole diameter with the no-go gauge end. If the go gauge enters the hole and the no-go gauge is unable to enter, the hole is within tolerance.
Inch—Class Z
| Choose a Size | Increment | Go Gauge Tolerance | No-Go Gauge Tolerance | Lg. | Surface Smoothness (RMS), microinch | Hardness | Material | Each | |
| 0.0110" to 0.0755" | 0.0005" | 0" to 0.0001" | -0.0001" to 0" | 5 1/4" | 8 | Rockwell C60 | Tool Steel | 00000000 | 000000 |
| 0.0760" to 0.1805" | 0.0005" | 0" to 0.0001" | -0.0001" to 0" | 5 15/32" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 0.1810" to 0.2815" | 0.0005" | 0" to 0.0001" | -0.0001" to 0" | 6 1/8" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 0.2820" to 0.4065" | 0.0005" | 0" to 0.0001" | -0.0001" to 0" | 6 19/32" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 0.4070" to 0.5005" | 0.0005" | 0" to 0.0001" | -0.0001" to 0" | 7 3/16" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 0.5010" to 0.5105" | 0.0005" | 0" to 0.0001" | -0.0001" to 0" | 7 3/16" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 0.5110" to 0.6255" | 0.0005" | 0" to 0.0001" | -0.0001" to 0" | 7 17/32" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 0.6260" to 0.6355" | 0.0005" | 0" to 0.0001" | -0.0001" to 0" | 7 17/32" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 0.6360" to 0.7505" | 0.0005" | 0" to 0.0001" | -0.0001" to 0" | 7 21/32" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 0.7510" to 0.7605" | 0.0005" | 0" to 0.0001" | -0.0001" to 0" | 7 21/32" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 0.7610" to 0.8325" | 0.0005" | 0" to 0.0001" | -0.0001" to 0" | 8 1/4" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 0.8330" to 0.9165" | 0.0005" | 0" to 0.0001" | -0.0001" to 0" | 8 1/4" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 0.9170" to 1.0005" | 0.0005" | 0" to 0.0001" | -0.0001" to 0" | 8 1/4" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
Inch—Class X
| Choose a Size | Increment | Go Gauge Tolerance | No-Go Gauge Tolerance | Lg. | Surface Smoothness (RMS), microinch | Hardness | Material | Each | |
| 0.0040" to 0.0250" | 0.0001" | 0" to 0.00004" | -0.00004" to 0" | 5 1/4" | 4 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
| 0.0251" to 0.0750" | 0.0001" | 0" to 0.00004" | -0.00004" to 0" | 5 1/4" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 0.0751" to 0.1800" | 0.0001" | 0" to 0.00004" | -0.00004" to 0" | 5 15/32" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 0.1801" to 0.2810" | 0.0001" | 0" to 0.00004" | -0.00004" to 0" | 6 1/8" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 0.2811" to 0.4060" | 0.0001" | 0" to 0.00004" | -0.00004" to 0" | 6 19/32" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 0.4061" to 0.5100" | 0.0001" | 0" to 0.00004" | -0.00004" to 0" | 7 3/16" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 0.5101" to 0.6350" | 0.0001" | 0" to 0.00004" | -0.00004" to 0" | 7 17/32" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 0.6351" to 0.7600" | 0.0001" | 0" to 0.00004" | -0.00004" to 0" | 7 21/32" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 0.7601" to 1.0000" | 0.0001" | 0" to 0.00006" | -0.00006" to 0" | 8 1/4" | 4 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
Metric—Class Z
| Choose a Size | Increment | Go Gauge Tolerance | No-Go Gauge Tolerance | Lg. | Surface Smoothness (RMS), microinch | Hardness | Material | Each | |
| 0.2200mm to 1.9000mm | 0.01mm | 0mm to 0.0025mm | -0.0025mm to 0mm | 5 1/4" | 8 | Rockwell C60 | Tool Steel | 00000000 | 000000 |
| 1.9100mm to 4.5600mm | 0.01mm | 0mm to 0.0025mm | -0.0025mm to 0mm | 5 15/32" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 4.5700mm to 7.1400mm | 0.01mm | 0mm to 0.0025mm | -0.0025mm to 0mm | 6 1/8" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 7.1500mm to 10.3200mm | 0.01mm | 0mm to 0.0025mm | -0.0025mm to 0mm | 6 19/32" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 10.3300mm to 12.7000mm | 0.01mm | 0mm to 0.0025mm | -0.0025mm to 0mm | 7 3/16" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 12.9700mm to 15.3000mm | 0.01mm | 0mm to 0.0025mm | -0.0025mm to 0mm | 7 17/32" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 15.3100mm to 16.2000mm | 0.01mm | 0mm to 0.0025mm | -0.0025mm to 0mm | 7 17/32" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 16.2100mm to 19.3000mm | 0.01mm | 0mm to 0.0025mm | -0.0025mm to 0mm | 7 21/32" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 19.3100mm to 20.3600mm | 0.01mm | 0mm to 0.0025mm | -0.0025mm to 0mm | 7 21/32" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 20.3700mm to 22.0400mm | 0.01mm | 0mm to 0.0025mm | -0.0025mm to 0mm | 8 1/4" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
| 23.7300mm to 25.4100mm | 0.01mm | 0mm to 0.0025mm | -0.0025mm to 0mm | 8 1/4" | 8 | Rockwell C60 | Tool Steel | 00000000 | 00000 |
Metric—Class X
| Choose a Size | Increment | Go Gauge Tolerance | No-Go Gauge Tolerance | Lg. | Surface Smoothness (RMS), microinch | Hardness | Material | Each | |
| 0.101mm to 0.381mm | 0.001mm | 0mm to 0.001mm | -0.001mm to 0mm | 5 1/4" | 4 | Rockwell C60 | Tool Steel | 0000000 | 0000000 |
| 0.382mm to 0.762mm | 0.001mm | 0mm to 0.001mm | -0.001mm to 0mm | 5 1/4" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 0.763mm to 1.905mm | 0.001mm | 0mm to 0.001mm | -0.001mm to 0mm | 5 1/4" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 1.906mm to 4.572mm | 0.001mm | 0mm to 0.001mm | -0.001mm to 0mm | 5 1/2" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 4.573mm to 7.137mm | 0.001mm | 0mm to 0.001mm | -0.001mm to 0mm | 6 1/8" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 7.138mm to 10.312mm | 0.001mm | 0mm to 0.001mm | -0.001mm to 0mm | 6 3/4" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 10.313mm to 12.954mm | 0.001mm | 0mm to 0.001mm | -0.001mm to 0mm | 7 1/4" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 12.955mm to 16.129mm | 0.001mm | 0mm to 0.001mm | -0.001mm to 0mm | 7 1/2" | 4 | Rockwell C60 | Tool Steel | 0000000 | 00000 |
| 16.130mm to 19.304mm | 0.001mm | 0mm to 0.001mm | -0.001mm to 0mm | 7 3/4" | 4 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
| 19.305mm to 25.654mm | 0.001mm | 0mm to 0.001mm | -0.001mm to 0mm | 8 1/4" | 4 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
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 | 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 | |
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 |