Use these Class Z go gauges to check the minimum hole diameter. Also known as pin gauges, they help you measure hole size and depth, check hole location and distance, and set micrometers.

These metric Class Z plug gauges are used for precision go/no-go measuring of hole sizes and depths, checking hole location and distance, and setting micrometers. They’re also known as pin gauges.

Use these metric Class X plug gauges for precision go/no-go measuring of hole sizes and depths, checking hole location and distance, and setting micrometers. They’re also called pin gauges.

The black-oxide treatment on these no-go gauges shows wear patterns so you can tell when you need to calibrate or replace the gauge—they help you check the maximum hole diameter.

Get your choice of one target-size gauge with 12 larger gauges and 12 smaller gauges, graduated in 0.0001”. Use these sets to measure hole sizes and depths, check hole locations and distance, and set micrometers.

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.

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.

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.

Test if internal threads fall within tolerance.

Set includes calipers and gauges to identify external and internal threads

Identify threads per inch on external threads and find the center of your workpiece to line up thread cutting tools.

Thread your fastener into holes or onto plugs for quick and accurate size identification.

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

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

Check external NPT thread size and taper.

These rods, also known as drill blanks, have an undersized diameter for machining your own jobbers'-length drill bits.