Metric Gauges | McMaster-Carr

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	System of Measurement System of Measurement

Metric

	Thread Size Thread Size

	Thread Type Thread Type	Show

Metric

	Thread Type Thread Type	Hide

UN/UNF (SAE Straight)

	Pitch Pitch

	For Thread Fit For Thread Fit

Class 6g

Class 6H

	Gauge Type Gauge Type

No-Go

	Material Material

Plastic

Steel

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Hardness Hardness

Rockwell C60

Rockwell C70

	Class Class

	Finish Finish

Chrome Plated

	Certification Certification

Calibration Certificate
Traceable to NIST

	Connection Style Connection Style

	Threaded

	Hex Size Hex Size

	For Use With For Use With

Diesel Fuel

Hydraulic Fluid

Water

	Thread Pitch Thread Pitch

1.5 mm

	Gender Gender

Male

	Connection Type Connection Type

	Pipe

	Window Diameter Window Diameter

	Maximum Temperature Maximum Temperature

210° F

	Seal Material Seal Material

Rubber

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129 Products

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.

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.

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 Ring Gauges

Check a part’s external threads to ensure they fall within tolerance.

The 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.

Metric

Go Gauge
Thread Size	Pitch	Pitch Dia. Tolerance	Hardness	Material	For Thread Fit		Each
Class X
M1.6	0.35 mm	-0.005mm to 0.005mm	Rockwell C60	Tool Steel	Class 6g	000000000	0000000
M2	0.4 mm	-0.005mm to 0.005mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M2.5	0.45 mm	-0.005mm to 0.005mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M3	0.5 mm	-0.005mm to 0.005mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M3.5	0.6 mm	-0.005mm to 0.005mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M4	0.7 mm	-0.005mm to 0.005mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M5	0.8 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	00000000	000000
M6	1 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M8	1 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	00000000	000000
M8	1.25 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M10	1.25 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M10	1.5 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M12	1 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M12	1.25 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	00000000	000000
M12	1.5 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M12	1.75 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M14	1.5 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M16	1.5 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M16	2 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M18	1.5 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
No-Go Gauge
Class X
M1.6	0.35 mm	-0.005mm to 0.005mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M2	0.4 mm	-0.005mm to 0.005mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M2.5	0.45 mm	-0.005mm to 0.005mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M3	0.5 mm	-0.005mm to 0.005mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M3.5	0.6 mm	-0.005mm to 0.005mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M4	0.7 mm	-0.005mm to 0.005mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M5	0.8 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M6	1 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M8	1 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M8	1.25 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M10	1.25 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M10	1.5 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M12	1 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M12	1.25 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M12	1.5 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M12	1.75 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M14	1.5 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M16	1.5 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M16	2 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	000000
M18	1.5 mm	-0.008mm to 0.008mm	Rockwell C60	Tool Steel	Class 6g	000000000	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.

For technical drawings and 3-D models, click on a part number.

Metric

						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

Shatter-Resistant Sights

The window and body are made from a single piece of plastic, making these sights more shatter resistant than sights with a glass window. They are not rated for pressure.

For technical drawings and 3-D models, click on a part number.

				Temp. Range, °F
Thread Size	Window Dia.	Hex Size	Max. Pressure	Min.	Max.	For Use With	Window Material	Seal Material		Each
Plastic
Metric Male Thread
M16 × 1.5 mm	7/16"	3/4"	Not Rated	-20°	210°	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Plastic	Buna-N Rubber	00000000	00000
M20 × 1.5 mm	9/16"	7/8"	Not Rated	-20°	210°	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Plastic	Buna-N Rubber	00000000	0000
M25 × 1.5 mm	11/16"	1 1/16"	Not Rated	-20°	210°	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Plastic	Buna-N Rubber	00000000	0000
M27 × 1.5 mm	13/16"	1 1/16"	Not Rated	-20°	210°	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Plastic	Buna-N Rubber	00000000	0000
M30 × 1.5 mm	7/8"	1 3/16"	Not Rated	-20°	210°	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Plastic	Buna-N Rubber	00000000	0000
M40 × 1.5 mm	1 3/16"	1 5/8"	Not Rated	-20°	210°	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Plastic	Buna-N Rubber	00000000	0000