M10 Ring Gauges | McMaster-Carr

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Threaded Ring Gauges with Calibration Certificate

Not only were these gauges calibrated in a lab, but they also come with a certificate that's traceable to NIST. The certificate, sometimes called a test report and long form certificate, details the tested measurements. 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. Inspect faster by holding more than one ring gauge with a threaded ring gauge holder.

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.

Metric—Class X

Go Gauge
Thread Size	Pitch	Thread Direction	Hardness	Material	Pitch Dia. Tolerance		Each
For Thread Fit Class 6g
M10	1 mm	Right Hand	Rockwell C60	Tool Steel	-0.008 mm to 0 mm	00000000	0000000
M10	1.25 mm	Right Hand	Rockwell C60	Tool Steel	-0.008 mm to 0 mm	00000000	000000
M10	1.5 mm	Right Hand	Rockwell C60	Tool Steel	-0.008 mm to 0 mm	00000000	000000
No-Go Gauge
For Thread Fit Class 6g
M10	1 mm	Right Hand	Rockwell C60	Tool Steel	0 mm to 0.008 mm	00000000	000000
M10	1.25 mm	Right Hand	Rockwell C60	Tool Steel	0 mm to 0.008 mm	00000000	000000
M10	1.5 mm	Right Hand	Rockwell C60	Tool Steel	0 mm to 0.008 mm	00000000	000000

Threaded Ring Gauges

Check a part’s external threads to make sure they fall within tolerance. You can use these for bolts, threaded rods, bits, and more. All gauges come with a manufacturer’s certificate of accuracy, also known as a certificate of compliance or a short form certification, that verifies the thread sizes are within tolerance.

The part is within tolerance if it’s easy to thread a go gauge onto, but difficult to thread a no-go gauge more than two turns. Use a threaded ring gauge holder to keep two gauges on hand at once for faster inspection.

Go gauges check the maximum external thread size.

No-go gauges check the minimum external thread size.

Metric

Go Gauge
Thread Size	Pitch	Hardness	Material	For Thread Fit	Thread Direction	Pitch Dia. Tolerance		Each
Class X
M10	1 mm	Rockwell C60	Tool Steel	Class 6g	Right Hand	-0.008 mm to 0 mm	000000000	0000000
M10	1.25 mm	Rockwell C60	Tool Steel	Class 6g	Right Hand	-0.008 mm to 0 mm	000000000	000000
M10	1.5 mm	Rockwell C60	Tool Steel	Class 6g	Right Hand	-0.008 mm to 0 mm	000000000	000000
No-Go Gauge
Class X
M10	1 mm	Rockwell C60	Tool Steel	Class 6g	Right Hand	0 mm to 0.008 mm	000000000	000000
M10	1.25 mm	Rockwell C60	Tool Steel	Class 6g	Right Hand	0 mm to 0.008 mm	000000000	000000
M10	1.5 mm	Rockwell C60	Tool Steel	Class 6g	Right Hand	0 mm to 0.008 mm	000000000	000000