The Fowler 52-250-111-1 Disc Micrometer has the following specifications:
Disc Diameter: .787"
The Fowler 52-250 series of disc micrometers simplify measuring thickness
of difficult, closely spaced sections, ribs, keys, fins,
cutting edges on forming tools, chordal thickness of
gear teeth and more. The extra large diameter discs on the 52-250-111-1 will enter normally inaccessible places such as narrow
grooves, slots and recesses.
Ratchet thimble ensures greater repeatability among users
Quick and easy zero adjustment on sleeve
Anvil and spindle are hardened and precision ground with micro lap finish on measuring faces.
Hammer tone blue baked enamel frame is tapered for hard-to-get-at places.