Ring Gauges | McMaster-Carr

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System of Measurement

Inch

Metric

Size-Checking Gauge Class

Gauge Measurement Type

Thread Size

Thread Type

Thread Fit

Unified Standard Class 2A

Unified Standard Class 3A

Surface Smoothness, RMS

4 μin

8 μin

Certificate Type

Accuracy Certificate Traceable to NIST

Calibration Certificate Traceable to NIST

REACH

Thread Direction

Material

RoHS

DFARS Specialty Metals

Hardness

For Ring Gauge Size

9.271 mm to 12.954 mm

12.954 mm to 20.955 mm

20.955 mm to 28.829 mm

28.829 mm to 38.354 mm

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

Yes

Export Control Classification Number (ECCN)

Pipe Size

Pitch

Length

Screw Size

Overall Length

871 Products

Ring Gauges

Ring Gauges for Outside Diameters

Check the outside diameter of shafts, rods, and other cylindrical objects

32 products

Master Ring Gauges

Set inside micrometers, dial bore gauges, and other precision tools

16 products

Threaded Ring Gauges with Calibration Certificate

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

334 products

Threaded Ring Gauges

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

236 products

Threaded Ring Gauges for Pipe Threads with Calibration Certificate

Confirm that external pipe threads are sized within tolerance

37 products

Threaded Ring Gauges for Pipe Threads

Confirm that external pipe threads are sized within tolerance

47 products

Left-Hand Threaded Ring Gauges with Calibration Certificate

Test if the left-hand threads on parts fall within tolerance

76 products

Left-Hand Threaded Ring Gauges

Test if the left-hand threads on parts fall within tolerance

76 products

Other Products

Ring Gauge Holders

Keep ring gauges still to measure cylindrical parts or threads quickly and repeatedly

17 products