Fowler 52-250-301-1 Digit Counter Disc Micrometer, 0-1" Measuring Range, 0.0001" Graduation, 0.00016" Accuracy

The Fowler 52-250-301-1 outside micrometer has a digit display with 0.001" graduations and a secondary Vernier-scale with 0.0001" graduations, an accuracy of 0.00016", a 0 to 1" measuring range, and a disc-style anvil/spindle pair to measure thickness of narrow grooves and difficult or closely spaced areas, such as slots and recesses. Disc micrometers are also used to measure ribs, keys, fins, and cutting edges on forming tools, and the chordal thickness of gear teeth. The anvil/spindle shafts have a 0.256" diameter, and hardened, ground, and micro-lapped measuring faces provide wear resistance. The discs have a 0.708" diameter, a 0.280" center-hole diameter, and a 0.035" edge thickness for measuring hard-to-reach areas. A 0.00004" flatness and 0.00016" parallelism provide accurate measurements. 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. The ratchet-stop thimble 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 provides durability and long life and is tapered for hard-to-reach areas. The micrometer includes a wrench and a fitted case.

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.

What’s in the Box?

• Fowler 52-250-301-1 disc micrometer
• Wrench
• Fitted case