Gauge Balls | McMaster-Carr

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427 Products

Metal

Hard Wear-Resistant 52100 Alloy Steel Balls

Also known as chrome steel, 52100 is an extremely hard and wear-resistant material. These balls are often used in bearings.

Tight-Tolerance Hard Wear-Resistant
52100 Alloy Steel Balls

The diameter on these balls is held to a precise tolerance.

Low-Carbon Steel Balls

Also known as mild steel, low-carbon steel balls are our easiest steel balls to machine. They are often used for parts that don’t require high strength, such as knobs.

Tight-Tolerance Hardened 440C Stainless Steel

With a diameter that’s held to a close tolerance, this material is hardened for increased wear and abrasion resistance.

Hardened Bearing-Quality 440C Stainless Steel

These balls are hardened for increased wear and abrasion resistance.

Impact-Resistant 440A Stainless Steel

440A stainless steel resists damage from impact and abrasion. It's often used for cutlery and valve components.

Tight-Tolerance Multipurpose 304 Stainless Steel

This material has tighter tolerances than standard 304 stainless steel.

Corrosion-Resistant 316 Stainless Steel

The addition of molybdenum gives 316 stainless steel excellent corrosion resistance. Use it in a variety of marine and chemical-processing applications.

Ultra-Hard C2 Tungsten Carbide Balls

Hardened Shock-Resistant S2 Tool Steel

This S2 tool steel has been hardened for excellent strength and impact resistance. It has a tough core that resists breaking under shock loads.

Dimensional Measuring and Size Checking

Economy Small-Bore Gauge Sets

Measure the diameter of small holes, grooves, and recesses.

Starrett Small-Bore Gauge Sets

Check a variety of hole, groove, and slot diameters. Each gauge in these sets has a different measuring range.

Starrett Small-Bore Gauges

Measure the diameter of small holes, grooves, and recesses.

Ball Bore Gauge Sets

Keep over two dozen different ball diameters on hand to check bore sizes or use as go/no-go gauges.

Mitutoyo Small-Bore Dial Gauges

Check for sizing errors in small slots and holes. These bore gauges are often used in precision manufacturing to test electronics and small-scale prototypes.

Starrett Small-Bore Dial Gauges

The dial on these gauges displays size deviations in real time. These gauges measure small slots and bores in precision parts, such as electronics, where even small size deviations can cause inefficiencies.

Ball-End Plug Gauges with Handle

Check the true diameter of holes, even if they’re bent or curved. The thin stem on these gauges flexes to reach features deep inside holes and cavities.