Mitutoyo-516-935-26 Steel Rectangular Micrometer Inspection Gage Block Set, A

Blocks included in the set measure .0625, .100, .125, .200, .250, .300, .500, 1, and 2. Gauge blocks are square or rectangular in shape, with flat surfaces, and have an engraved unique identification number and length (provided in either inches or millimeters). They often come in sets with blocks of varying lengths, so that many different standard lengths can be created by stacking and wringing them. Wringing is the process of sliding blocks together with a small amount of oil, in order to create a longer surface. The length of a gage block is usually slightly shorter than its stamped nominal length, to account for the thin layer of oil or wring film used when two or more blocks are wrung together. They are kept within a protective case, cleaned thoroughly between uses to prevent corrosion, and kept free of burrs and other damage that would decrease their accuracy. Some gage blocks are vulnerable to thermal expansions and must be kept at room temperature (about 68 degrees F) to ensure their accuracy. Gauge blocks are available in different grades, which refer to their tolerance or deviation from their nominal dimension. Grades are defined by the American National Standard for gauge blocks, the American Society of Mechanical Engineers (ASME) B89.1.9M for both length and flatness. A certificate of inspection and calibration is provided with each gauge block or set, specifying the deviation of the individual block from its nominal length. Can be used for checking spindle wear on outer diameter (OD) micrometers Sized to check different degrees of spindle rotation Steel blocks are made from high-carbon, high-chrome steel to reduce wear and corrosion Thermally stabilized to reduce changes in gage block length over time