Mitutoyo Indicating 25-50mm 510-102 Micrometer

Description

This is a used vintage Mitutoyo 25-50mm 510-102 Indicating Micrometer, Model No. 510-102, Serial No. 10861, featuring a rare ± scale on the fixed anvil for direct deviation readings. It measures in the 25-50 mm range with 0.001 mm graduations on the dial, designed for high-precision external measurements. The carbide-tipped measuring faces ensure durability, with a flatness of approximately 0.6 µm and parallelism around 2 µm, consistent with Mitutoyo’s standards for this series.

The retractable anvil and dial indicator allow for three-wire measurements of pitch diameter on precision screws, as well as roundness and parallelism checks. It has an 8 mm spindle diameter and a measuring force of 5-15 N (500-1500 gf). The adjustable zero setting ensures calibration within its range, though the dial’s jewelled movement may need inspection due to age.

The frame shows signs of wear, including scratches and patina, typical for a tool of this vintage. It includes a friction thimble for fine adjustments. No setting standard or accessories are included with this used item, but it remains a functional, collectible piece for machinists or tool enthusiasts seeking a rare Mitutoyo indicating micrometer.