The Fowler 52-244-201-1 outside micrometer has a digit display with a secondary Vernier scale, a 0 to 1" measuring range, and a ball anvil and flat spindle pair for measuring the inside diameter of sleeves, collars, tubing, and other curved and cylindrical surfaces. The ball anvil contacts the inside curve at a single point, providing accurate measurements. The digit display has a 0.001" resolution and the secondary Vernier-scale has 0.0001" graduations for precise readings. An overall accuracy of 0.00016" provides accurate measurements. The flat spindle has a hardened and ground carbide measuring face to provide wear resistance. The hardened, ground, and lapped spindle thread provides smooth movement, accuracy, and long life. The positive locking nut on the spindle locks measurements in place for accurate readings and the zero adjustment on the sleeve ensures accurate measurements. The ratchet-stop thimble can be used independently of the friction thimble. It provides an audible sound and stops the spindle from turning when the spindle comes into contact with the workpiece, providing constant force for consistent measurements between operators. The baked-enamel frame is heat-insulated to provide durability, long life, and resistance to temperature-related expansion and contraction. The micrometer includes a wrench and a fitted case.
| Specifications | |
|---|---|
| Display type | Digit with Vernier scale |
| Anvil/spindle style | Ball anvil with flat spindle |
| Measuring range | 0 to 1" |
| Graduation interval | 0.001" on digit counter, 0.0001" on Vernier scale |
| Accuracy | 0.00016" |
| Thimble style | Ratchet stop |
| Anvil/spindle diameter | 0.256" |
Micrometers are precision measuring instruments that use a calibrated screw to measure 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 Fred V. Fowler Company manufactures inspection and measurement instruments such as electronic indicators, calipers, bore gages, and digital scales. The company, founded in 1946, is headquartered in Newton, MA.
