Threaded Plug Gauges

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195 Products

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

Class X
Thread Size	Thread Type	Pitch Dia. Tolerance	Hardness	Material	Choose a For Thread Fit		Each
0-80	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	0000000
1-72	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
2-56	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
3-48	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
4-40	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
4-48	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
5-40	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
6-32	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
6-40	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
8-32	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
8-36	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
10-24	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
10-32	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
12-24	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
1/4"-20	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
1/4"-28	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
5/16"-18	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
5/16"-24	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
3/8"-16	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
3/8"-24	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
7/16"-14	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
7/16"-20	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
1/2"-13	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
1/2"-20	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
9/16"-18	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
5/8"-11	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
5/8"-18	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
3/4"-10	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
3/4"-16	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
7/8"-9	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
7/8"-14	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
1"-8	UNC	-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
1"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
1 1/8"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
1 1/4"-7	UNC	-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000
1 1/4"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Class 2B, Class 3B	00000000	000000

Metric

Class X
Thread Size	Pitch	Pitch Dia. Tolerance	Hardness	Material	For Thread Fit		Each
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.

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

Class 2B
Thread Size	Thread Type	Pitch Dia. Tolerance	Hardness	Material		Each
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.

Class X
Pipe Size	Pitch Diameter Tolerance	Hardness	Material		Each
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.

Class X
Pipe Size	Pitch Diameter Tolerance	Hardness	Material		Each
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.

Class X
Pipe Size	Pitch Diameter Tolerance	Hardness	Material		Each
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