M5 Ring Gauges | McMaster-Carr

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0.8 mm

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Accuracy Certificate Traceable to NIST

Calibration Certificate Traceable to NIST

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Metric

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Thread Direction

Thread Fit

Material

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

DFARS Specialty Metals

Hardness

RoHS

REACH

Export Control Classification Number (ECCN)

EAR99

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12 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

				M5 × 0.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.005 to 0	3227A269	0000000	0 to 0.005	3227A271	0000000


				M5 × 0.8 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A129	000000	0 to 0.008	3227A128	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



		M5 × 0.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.005 to 0	23575A205	0000000	0 to 0.005	23575A206	0000000


		M5 × 0.8 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A12	000000	0 to 0.008	23575A119	000000

Left-Hand Threaded Ring Gauges with Calibration Certificate

Calibrated in a lab and backed by a certificate traceable to NIST, these gauges check if left-hand threads fall within tolerance. The certificate, sometimes called a test report and long-form certificate, details the tested measurements. Use these gauges on screws, threaded rods, and other parts with external threads. For faster tests, hold more than one ring gauge with a threaded ring gauge holder.

Your part is within tolerance if it’s easy to thread a go gauge onto it but difficult to thread a no-go gauge more than two turns.

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—Thread fit designates the tightness or looseness of mating threads. For inch threads, the higher the class number, the tighter the fit. These metric-threaded ring gauges are class 6g, which is comparable to the fit of those with unified standard class 2A threads.

						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

				M5 × 0.8 mm	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	7836N42	0000000	0 to 0.008	7836N84	0000000

Left-Hand Threaded Ring Gauges

Test if the left-hand threads on parts fall within tolerance. These gauges are often used with parts such as screws, bolts, and threaded rods. All 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.

Class X Gauges

Image of Product. Front orientation. Ring Gauges. Left-Hand Threaded Ring Gauges.

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 Direction	Hardness	Material	Certificate Type	Pitch Dia. Tolerance, mm		Each	Pitch Dia. Tolerance, mm		Each
For Class 6g Metric Thread Fit







				Metric Thread

				M5 × 0.8 mm	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.008 to 0	8399N42	0000000	0 to 0.008	8399N84	0000000