The Mitutoyo 511-212 bore gage is small, for measuring small holes, includes a dial indicator, and the measurement range is 0.24 to 0.4” with + or - 0.0002” of accuracy and an indication stability 0.00008”. The gage stem diameter is 0.375”, and the probe depth is 2". The bore gage weight is .57 pounds. The gage includes a dial indicator with graduation of 0.0001”. The indicator is protected by a cover. The nine interchangeable anvils are made of alloyed steel, for strength.

Bore gages measure holes, or bores, in a workpiece. They can measure the interior diameter of a hole at any depth, while internal micrometers can only measure to the depth of their teeth. Bore gages are typically calibrated with a setting ring. Bore gages come in two types, one simple, and the other direct-measuring. Simple bore gages are used with a caliper to transfer the hole measurement, while the more complex gages take the measurement directly, and display the measurement through a vernier, dial, or digital display. Bore gages have a two- or three-point contact, which indicates how many points on the gage head touch the inside of the bore. Two-point contacts are better at measuring ovality, while three-point systems are used to measure lobing, or triangular form error. Pistol-grip bore gages are used for fast, single-handed operation with good repeatability from one operator to another. Bore gages, regardless of type, can be used in some special applications, such as measuring threads, spline pitch diameters, and deep bores.

Mitutoyo manufactures precision measuring tools, metrology equipment, and systems. The company was founded in Tokyo in 1934 and formed Mitutoyo America Corporation in 1963, which is headquartered in Aurora, IL.

What’s in the Box?

• Mitutoyo 511-212 bore gage
• Mitutoyo 2923SB-10 dial indicator with cover
• 9 alloy steel anvils
• Spacer

Small size for small holes

Measurement range of 0.24 to 0.4"

+ or - 0.0002" of accuracy with indication stability 0.00008"

Includes dial indicator with graduation of 0.0001"

Gage stem 0.375" in diameter, probe depth of 2"