Starrett 724LZ-18 Tubular Bow Type Micrometre, Interchangeable Anvils, Plain Thimble, Lock Nut, 12-18" Range, 0.001" Graduation, +/-0.0003" Accuracy

The Starrett 436 series outside micrometre has a bow-type shape for measurement of large outside dimensions, a Vernier scale in inch units for taking precise outside diameter (OD) measurements, and includes interchangeable anvils for a diversified range of measurement. The micrometre's frame is made of hollow tubular steel that helps provide light weight with rigidity and balance. The Vernier scale on the thimble and sleeve is graduated to 0.001”, with a satin chrome rust- and glare-resistant finish. The steel spindle and anvils have flat, micro-lapped measuring faces for accuracy. A knurled ring-type lock nut helps provide secure locking of the measurement position. The micrometre and accessories come with a fitted wood case for storage. Micrometres 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. Micrometres are typically used in manufacturing, machining, and mechanical engineering. There are three types of micrometre: outside, inside, and depth. Outside micrometres may also be called micrometre callipers, and are used to measure the length, width, or outside diameter of an object. Inside micrometres are typically used to measure interior diameter, as in a hole. Depth micrometres 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.