Micrometer
Outside micrometer parts : The figure illustrates an outside micrometer. It is used to measure the outside diameter and length of small parts to an accuracy of 0.01mm. The main parts of an outside caliper are: 1. U shaped steel frame 2. anvil & spindle 3. lock nut 4. sleeve or barrel 5. thimble 6. ratchet. micrometer diagram. 1.U shaped steel frame