Starrett 224MGRLZ Interchangeable Anvil Micrometer, Ratchet Stop, Lock Nut, 150-300 mm Range, 0.01 mm Graduation

The Starrett 224M Series interchangeable anvil micrometer includes a set of interchangeable anvils to provide a full range of measurements in increments of 25mm. It features a vernier scale in metric units for precise outer diameter (OD) measurements and a ratchet-stop mechanism that delivers consistent pressure for accurate, repeatable measurements. The frame of the micrometer is made of ribbed cast iron with perforations that provide light weight with rigidity. The vernier scale on thimble and sleeve is graduated to 0.01mm, with a satin chrome finish that helps resist rust and reduce glare. The spindle and anvils are made of hardened steel for durability. A knurled ring-shaped lock nut ensures secure locking of the measuring position. The micrometer and accessories come with a matching wooden case for storage. Micrometers are precision gauges that use a calibrated screw to measure small distances. These measurements are translated into large rotations of the screw, which can then be read from a scale or dial. Micrometers are typically used in manufacturing, machining and mechanical engineering. There are three types of microns: exterior, inside and deep. External micrometers can also be called micrometer calipers and are used to measure the length, width or outer diameter of an object. Internal micrometers are typically used to measure the inner diameter, as in a hole. Depth micrometers measure the height or depth of any shape with a step, groove or slot. The L.S. Starrett Company manufactures precision measuring tools, measurement and testing equipment, and saw blade products. The company was founded in 1880 and is headquartered in Athol, MA.