Starrett 436MXRL-300 Outside Micrometer, Ratchet Stop, Lock Nut, Carbide Faces, 275-300 mm Range, 0.01 mm Graduation, +/-0.007 mm Accuracy

The Starrett 436 series outside micrometer has a bow-type shape for measurement of large outside dimensions, a Vernier scale in metric units for taking precise outside diameter (OD) measurements and a ratchet-stop mechanism that helps provide uniform pressure for precise, repeatable measurements. The micrometer’s frame is made of ribbed cast iron with perforations that helps provide light weight with rigidity. The Vernier scale on the thimble and sleeve is graduated to 0.01mm with a satin chrome rust- and glare-resistant finish. The spindle and anvil have flat, micro-lapped measuring faces for accuracy and are carbide-tipped for wear resistance. A knurled ring-type lock nut helps provide secure locking of the measurement position. Micrometers are precision measuring instruments that use a calibrated screw to measure small distances. These measurements are translated into large rotations of the screw that are then able to be read from a scale or a dial. Micrometers are typically used in manufacturing, machining and mechanical engineering. There are three types of micrometer: outside, inside and depth. Outside micrometers may also be called micrometer callipers and are used to measure the length, width or outside diameter of an object. Inside micrometers are typically used to measure interior diameter, as in a hole. Depth micrometers measure the height or depth, of any shape that has a step, groove or slot. The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment and saw blade products. The company was founded in 1880 and is headquartered in Athol, MA.