UNC Gauges | McMaster-Carr

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System of Measurement

Thread Size

Screw Size

Thread Type

UN/UNF (SAE Straight)

Diameter

For Use With

Thread Location

Material

Thread Fit

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

Width

Drill Bit Size

Length

Thread Pitch

Height

Thickness

Gauge Measurement Type

Manufacturer

Container Type

DFARS Specialty Metals

Exempt

REACH

Compliant

Not Compliant

Export Control Classification Number (ECCN)

EAR99

Number of Identifiers

RoHS

Container Material

Size-Checking Gauge Class

Thread Direction

329 Products

Size Checking

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 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.

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.

Threaded Plug Gauges

Test if internal threads fall within tolerance.

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 with Calibration Certificate

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

Left-Hand Threaded Ring Gauges

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

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.

Threads per Inch and Thread Pitch Size Checkers

Inspect fasteners and verify threads with this checker.

Threaded Hole Location Gauges

Find the true center of threaded holes to precisely align and measure parts.

Fastener Thread Size Identifiers

Screw Size Identifiers

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

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 nuts, bolts, and other fasteners.

Thread Identifier Sets

Set includes calipers and gauges to identify external and internal 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.

Size Checking

Go/No-Go Threaded Plug Gauges with Handle

Go/No-Go Helical Insert ThreadedPlug Gauges with Handle

Go/No-Go Left-Hand ThreadedPlug Gauges with Handle

Threaded Plug Gauges

Threaded Ring Gauges

Threaded Ring Gauges with Calibration Certificate

Left-Hand Threaded Ring Gauges

Left-Hand Threaded Ring Gaugeswith Calibration Certificate

Threads per Inch and Thread Pitch Size Checkers

Threaded Hole Location Gauges

Fastener Thread Size Identifiers

Screw Size 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

Thread Identifier Sets

Threads per Inch and Center Identifiers

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

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

Left-Hand Threaded Ring Gauges
with Calibration Certificate

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