McMaster-Carr

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	For System of Measurement For System of Measurement

Inch

Metric

	For Thread Type For Thread Type

	For Use With For Use With

	Material Material

	System of Measurement System of Measurement

Inch

Metric

	For Thread Size For Thread Size

	For Thread Location For Thread Location

External

Internal

	For Screw Size For Screw Size

	Height Height

	Thickness Thickness

	Width Width

	For Pipe Size For Pipe Size

1 1/2
2
2 1/2
3
3 1/2
4
5
6

	Thread Size Thread Size

	Thread Type Thread Type

	For Threads per Inch For Threads per Inch

1
1 1/3
1 1/2
1 3/4
2
2 1/2
3
3 1/2
4
4 1/2
5
5 1/2
6
7
7 1/2
8
9
10
11
11 1/2
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	For Thread Pitch For Thread Pitch

	Mounting Hole Diameter Mounting Hole Diameter

1/8"

5/16"

	Number of Identifiers Number of Identifiers

	Thread Fit Thread Fit

	For Threads per Inch For Threads per Inch

	For Drill Bit Size For Drill Bit Size

	Gauge Type Gauge Type

No-Go

	For Diameter For Diameter

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233 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.

Screw Size Identifiers

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

Threads per Inch and
Thread Pitch Identifiers

Determine threads per inch and thread pitch on a variety of external and internal threads.

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
for NPT Pipe Threads

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

Threads per Inch and
Thread Pitch Size Checkers

Inspect fasteners and verify threads with this checker.

Threaded Ring Gauges

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

Threaded Ring Gauges
for NPT Pipe Threads

Measure NPT pipe threads.

Gear Tooth Pitch Identifiers

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

Terms and Conditions and Privacy Policy

Size Identifying

Thread-It Screw, Bolt,and Nut Size Identifiers

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

Screw Size Identifiers

Threads per Inch andThread Pitch Identifiers

Thread Identifier Sets

Screw, Bolt, and Nut Size Identifiers

Threads per Inch andCenter Identifiers

Acme Thread Identifiers

Pipe Thread andThread Pitch Identifiers

Pipe Thread Identifiers

Pipe, Tubing, andHose Size Identifiers

All-in-One Identifiers

Drill Bit Size Identifiers

Size Checking

Threaded Plug Gauges

Threaded Plug Gaugesfor NPT Pipe Threads

Threads per Inch andThread Pitch Size Checkers

Threaded Ring Gauges

Threaded Ring Gaugesfor NPT Pipe Threads

Gear Tooth Pitch Identifiers

Gear Tooth Pitch Identifiers

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

Threads per Inch and
Center Identifiers

Pipe Thread and
Thread Pitch Identifiers

Pipe, Tubing, and
Hose Size Identifiers

Threaded Plug Gauges
for NPT Pipe Threads

Threads per Inch and
Thread Pitch Size Checkers

Threaded Ring Gauges
for NPT Pipe Threads