UNC Gauges | McMaster-Carr

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192 Products

Size Checking

Threaded Plug Gauges

These have a go gauge on one end and a no-go gauge on the other end.

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.

Threaded Ring Gauges

Threaded Ring Gauges

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

Threaded Ring Gauges with Calibration Certificate

Threaded Ring Gauges with Calibration Certificate

A certificate of calibration traceable to NIST states that these gauges have passed a test for accuracy.

Threads per Inch and Thread Pitch Size Checkers

Threads per Inch and Thread Pitch Size Checkers

Inspect fasteners and verify threads with this checker.

Fastener Thread Size Identifiers

Screw Size Identifiers

Find thread size, screw size, diameter, and drill bit size with one tool.

Thread-It Screw, Bolt, and Nut Size Identifiers

Thread your fastener into holes or onto plugs for quick and accurate size identification.

Wall-Mount Thread-It Screw,
Bolt, and Nut Size Identifiers

Mount to a wall for easy access, and thread your fastener into holes or onto plugs for quick and accurate size identification.

Thread Identifier Sets

Set includes calipers and gauges to identify external and internal threads

Threads per Inch and Thread Pitch Identifiers

Determine threads per inch and thread pitch on nuts, bolts, and other fasteners.

Threads per Inch and Center Identifiers

Identify threads per inch on external threads and find the center of your workpiece to line up thread cutting tools.

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)