Thread Gauges | McMaster-Carr

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DFARS Compliance

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Number of Identifiers

REACH Compliance

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Thread Pitch

For Acme Threads per Inch

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618 Products

Size Identifying

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-It Screw, Bolt, and Nut Size Identifiers

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 a variety of external and internal threads.

Screw Size Identifiers

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

Screw, Bolt, and Nut Size Identifiers

Use on external and internal fastener threads.

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.

Acme Thread Identifiers

Identify Acme threads and use as a guide while grinding and cutting Acme threads to a 29° included angle.

Pipe Thread and Thread Pitch Identifiers

In addition to checking NPT and BSPT pipe sizes, use the two included gauges for measuring thread pitch.

Pipe Thread Identifiers

Check external NPT thread size and taper.

Pipe, Tubing, and Hose Size Identifiers

Determine pipe size and inner and outer diameter.

All-in-One Identifiers

Find tube, pipe, fastener, wire, and drill bit sizes with one tool.

Drill Bit Size Identifiers

Measure drill bit sizes with these identifiers.

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 Plug Gauges for NPT Pipe Threads

A notch on the handle indicates when the internal NPT threads you’re checking are in tolerance.

Threaded Plug Gauges for NPT Pipe
Threads with Calibration Certificate

Ensure the accuracy of NPT thread measurements—these gauges come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy.

Threaded Ring Gauges

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

Threaded Ring Gauges with Calibration Certificate

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

Threaded Ring Gauges for NPT Pipe
Threads with Calibration Certificate

To ensure accuracy of NPT pipe thread measurements, these gauges include a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy.

Threaded Ring Gauges for NPT Pipe Threads

Measure NPT pipe threads.

Threads per Inch and Thread Pitch Size Checkers

Inspect fasteners and verify threads with this checker.

Master Ring Gauges

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

Ring Gauges for Outside Diameters

Use these gauges to check the outside diameter of shafts, rods, and other cylindrical objects to determine whether they’re in tolerance.

Outside Micrometers for Screw Threads

Measure thread accuracy in screw-cutting operations. The anvil and spindle have a 60° point for fitting into thread grooves.

Outside Micrometers for Screw
Threads with Calibration Certificate

These micrometers come with a calibration certificate traceable to NIST that states they've passed a test for accuracy.

Thread Gauges for Lug Nuts

Identify the most common bolt thread sizes.

Gear Tooth Pitch Identifiers

When replacing a gear, use these gauges to identify pressure angle, pitch, and module.