Measure the outside diameter of small round- and hex-shaped objects such as rods, drill bits, bolts, and tubing with this pocket-size tool. This identifier has wear-resistant etched markings.

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

Mount your variance indicator onto these gauges to measure the diameter of rims and shallow holes. They show deviation from a set reference to measure both internal and external diameters, while other tools like micrometers and bore gauges only take one type of measurement. Commonly used in cramped machining or assembly processes, these gauges fit in tight spaces. They are made from hardened steel, so they are durable enough to withstand bumps and scrapes and will stay accurate over time.

To set your reference measurement, use gauge blocks or a ring gauge. Place the contact pin on one side of the gauge blocks or ring, and slide the indicator away from the contact pin. This pinches the gauge blocks between the contact pin and indicator for outer diameter measurements or presses against the inner edge of the reference gauge for inner diameter measurements. Once the reference measurement is set, lock the gauge. Set the indicator to zero and you're ready to take your measurement. The indicator point stopper will flex slightly to fit the gauge into bores and around outer edges.

Confirm parts are within tolerance without twisting the thimble each time. These micrometers don't need batteries, so they're always ready for the job.

Also known as snap gauges for how they snap around rods, shafts, and other cylindrical objects, these gauges quickly check if an outside diameter is within tolerance. They have a hardened steel frame and spindle that stand up to flexing and temperature changes, so they stay accurate over time.

Indicators—Attach variance indicators to measure the difference between your part’s actual diameter and the expected diameter.

With a calibration certificate traceable to NIST that says they've passed a test for accuracy, you can trust these gauges to confirm if your object's outer diameter is within tolerance. They're also known as snap gauges because they snap onto rods, shafts, and other cylindrical objects. To maintain their accuracy over time, they have a hardened steel frame and spindle that withstands flexing and temperature changes.

Indicators—Attach variance indicators to measure the difference between your part’s actual diameter and the expected diameter. They also come with a calibration certificate traceable to NIST that states they’ve passed a test for accuracy.