Thread Gauges | McMaster-Carr

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Pitch Pitch

0.35mm

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607 Products

Size Identifying

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.

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, thread pitch, diameter, and drill bit size with one tool.

Thread Identifier Sets

Set includes calipers and gauges to identify external and internal threads

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.

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.

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.

Size Identifying

Thread-It Screw, Bolt, and Nut Size Identifiers

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

Threads per Inch and Thread Pitch Identifiers

Screw Size Identifiers

Thread Identifier Sets

Screw, Bolt, and Nut Size Identifiers

Threads per Inch and Center Identifiers

Acme Thread Identifiers

Pipe Thread and Thread Pitch Identifiers

Pipe Thread Identifiers

Pipe, Tubing, and Hose Size Identifiers

All-in-One Identifiers

Drill Bit Size Identifiers

Size Checking

Threaded Plug Gauges

Threaded Plug Gauges with Calibration Certificate

Threaded Plug Gauges for NPT Pipe Threads

Threaded Plug Gauges for NPT PipeThreads with Calibration Certificate

Threaded Ring Gauges

Threaded Ring Gauges with Calibration Certificate

Threaded Ring Gauges for NPT PipeThreads with Calibration Certificate

Threaded Ring Gauges for NPT Pipe Threads

Threads per Inch and Thread Pitch Size Checkers

Ring Gauges for Outside Diameters

Thread Gauges for Lug Nuts

Thread Gauges for Lug Nuts

Gear Tooth Pitch Identifiers

Gear Tooth Pitch Identifiers

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

Threaded Plug Gauges for NPT Pipe
Threads with Calibration Certificate

Threaded Ring Gauges for NPT Pipe
Threads with Calibration Certificate