Thread Guides | McMaster-Carr

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Unified Standard Class 2A

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EAR99

DFARS Specialty Metals

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1,434 Products

Thread Size Identifiers

Threads per Inch and Thread Pitch Identifiers

Press against threads to measure pitch and threads per inch

22 products

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

Thread Identifier Sets

Includes calipers and gauges to identify external and internal threads

1 product

Screw Size Identifiers

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

3 products

Pipe Thread and Thread Pitch Identifiers

Check NPT and BSPT pipe sizes and measure thread pitch

1 product

Threads per Inch and Thread Pitch Size Checkers

Calculate pitch diameter with the included wires and equations

1 product

Acme Thread Identifiers

Identify Acme threads and use as a guide while cutting them

1 product

Pipe Thread Identifiers

Insert NPT pipe to check thread size and taper

1 product

Thread-It Screw, Bolt, and Nut Size Identifiers

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

3 products

All-in-One Identifiers

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

2 products

Pipe, Tubing, and Hose Size Identifiers

Check pipe thread size and diameter

2 products

Screw, Bolt, and Nut Size Identifiers

Quickly check screw or nut size

3 products

Grease Fitting Size Identifiers

Screw grease fittings into the labeled holes until you find the one that fits

1 product

Thread Gauges for Lug Nuts

Identify the most common bolt thread sizes

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

547 products

Ring Gauges

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

810 products

Ring Gauge Holders

Keep ring gauges still to measure cylindrical parts or threads quickly and repeatedly

17 products

Drill Bit Size Gauges

Match your drill bit to one of the holes to confirm its size

5 products

Gear Tooth Gauges

Identify your gear's pressure angle, pitch, and module

4 products

Plug Gauge Drivers

Test thread tolerance in seconds to save time during high-volume work

1 product