UNC Thread Gauges | McMaster-Carr

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Thread Type

System of Measurement

Thread Size

For Use With

Thread Location

Material

Manufacturer

Number of Identifiers

Thread Fit

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

Thread Pitch

Container Type

Screw Size

Threads per Inch

Diameter

Width

Export Control Classification Number (ECCN)

EAR99

Height

5 1/8"

39"

Certificate Type

Accuracy Certificate Traceable to NIST

Calibration Certificate Traceable to NIST

DFARS Specialty Metals

RoHS

Thickness

Container Material

Gauge Measurement Type

No-Go

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

Folded Width

REACH

310 Products

Thread Size Identifiers

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

Mount to a wall for easy access
Thread fasteners into holes or onto plugs to quickly find thread size

1 product

Threads per Inch and Thread Pitch Identifiers

Press against threads to measure pitch and threads per inch

11 products

Thread Identifier Sets

Includes calipers and gauges to identify external and internal threads

1 product

Thread-It Screw, Bolt, and Nut Size Identifiers

Thread fasteners into holes or onto plugs to quickly find thread size

2 products

Screw Size Identifiers

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

1 product

Threads per Inch and Thread Pitch Size Checkers

Calculate pitch diameter with the included wires and equations

1 product

Threads per Inch and Center Identifiers

Measure external threads per inch and line up thread-cutting tools

1 product

Other Products

Plug Gauges

Verify the diameter or threads of machined holes in finished parts; also called pin gauges

132 products

Ring Gauges

Confirm your workpiece's outer diameter or external threads are within tolerance

160 products