M9 Thread Ring Gauges | McMaster-Carr

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Metric Class 6g

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8 Products

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.

Class X Gauges

Go Gauge—Go gauges check the maximum external thread size.

No-Go Gauge—No-go gauges check the minimum external thread size.

For Thread Fit—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.

						Go Gauge			No-Go Gauge
	Thread Size	Thread Direction	Hardness	Material	Certificate Type	Pitch Dia. Tolerance, mm		Each	Pitch Dia. Tolerance, mm		Each
For Class 6g Metric Thread Fit







				Metric Thread

				M9 × 1 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A212	0000000	0 to 0.008	3227A213	0000000


				M9 × 1.25 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A214	000000	0 to 0.008	3227A215	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 Gauge—Go gauges check the maximum external thread size.

No-Go Gauge—No-go gauges check the minimum external thread size.

							Go Gauge			No-Go Gauge
	Thread Size	Thread Type	Hardness	Material	Thread Direction	For Thread Fit	Pitch Dia. Tolerance, mm		Each	Pitch Dia. Tolerance, mm		Each
Class X Gauges



		M9 × 1 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A214	0000000	0 to 0.008	23575A215	0000000


		M9 × 1.25 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A216	000000	0 to 0.008	23575A217	000000