Thread Guides

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Thread Type

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For Use With

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Thread Fit

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

Pipe Size

Screw Size

Gauge Measurement Type

No-Go

Number of Identifiers

Export Control Classification Number (ECCN)

REACH

Thread Pitch

DFARS Specialty Metals

RoHS

Manufacturer

Certificate Type

Accuracy Certificate Traceable to NIST

Calibration Certificate Traceable to NIST

Threads per Inch

Thread Direction

Hardness

Size-Checking Gauge Class

Height

Width

Pitch

Gender

1,452 Products

Threads per Inch and Thread Pitch Identifiers

Determine threads per inch and thread pitch on nuts, bolts, and other fasteners.

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

Screw Size Identifiers

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

Acme Thread Identifiers

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

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.

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.

Grease Fitting Size Identifiers

Take the guesswork out of determining a grease fitting’s thread type and size.

Drill Bit Size Identifiers

Measure drill bit sizes with these identifiers.

Threads per Inch and Thread Pitch Size Checkers

Inspect fasteners and verify threads with this checker.

Threaded Plug Gauges with
Handle for Pipe Threads

Verify whether pipe fitting threads fall within tolerance. These gauges are attached to a handle, giving you a solid gripping point to thread and unthread them quickly.

Go/No-Go Threaded Plug Gauges with Handle

Speed up thread tolerance checks—the handle on these gauges gives you a good grip to quickly thread and unthread go or no-go gauges.

Go/No-Go Left-Hand Threaded
Plug Gauges with Handle

A go and no-go gauge in one, these gauges check that left-hand threads fall within tolerance.

Go/No-Go Helical Insert Threaded
Plug Gauges with Handle

Check that holes tapped for helical threads are within tolerance. To speed up tests, these gauges have a go gauge on one end and a no-go gauge on the other.

Acme Threaded Plug Gauges with Handle

Determine if lead nuts, screw collars, and other parts with internal Acme threads are within tolerance. These gauges are attached to a handle to help you quickly thread or unthread them.

Threaded Plug Gauges

Test if internal threads fall within tolerance.

Threaded Plug Gauge Handles

Speed up checking thread tolerances by threading a go gauge on one end of these handles and a no-go gauge on the other.

Battery-Powered Pistol-Grip
Drivers for Threaded Plug Gauges

Test thread tolerance in seconds. A time-saver for high-volume work, these drivers quickly thread gauges in and out of holes for you—just pull the trigger.

Threaded Ring Gauges

Check a part’s external threads to make sure they fall within tolerance. You can use these for bolts, threaded rods, bits, and more.

Threaded Ring Gauges for Pipe Threads

Confirm that external pipe threads are sized within tolerance.

Threaded Ring Gauges with Calibration Certificate

Not only were these gauges calibrated in a lab, but they also come with a certificate that's traceable to NIST.

Threaded Ring Gauges for Pipe
Threads with Calibration Certificate

These gauges come with a certificate that’s traceable to NIST, confirming they were calibrated in a lab. Use them to verify whether external pipe threads are within tolerance.

Left-Hand Threaded Ring Gauges

Test if the left-hand threads on parts fall within tolerance.

Threaded Ring Gauge Holders

Join two ring gauges with different sizes to quickly check if threads are within tolerance. Secure your gauges to these holders with the included fasteners.

Left-Hand Threaded Ring Gauges
with Calibration Certificate

Calibrated in a lab and backed by a certificate traceable to NIST, these gauges check if left-hand threads fall within tolerance.

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.

Ring Gauge Holders

Often used with go and no-go ring gauges, these holders keep two ring gauges still for quick, repeat measuring.

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.