The Starrett 436 series outside micrometer 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 a ratchet-stop mechanism that helps provide uniform pressure for precise, repeatable measurements. The micrometers 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 0.001 or 0.0001 depending on the model, 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 calipers, 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.

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