831A Small Hole Gage 53083

The Starrett 831 Small Hole Gage is exactly the same as the 829 Series except that the gaging surface is a half-ball with a flat bottom. This permits use in even the most shallow holes, slots, and recesses. .125-.200" (3.2-5.1mm) Range, 2 13/16" (70mm) Length recesses.

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  • Ideal for accurately measuring small holes, slots, grooves, and recesses
  • Precision Ground Radius on each gage provides two-point contact for maximum accuracy
  • Used for general work
  • Permits use in shallow holes, slots, and recesses
  • Well balanced
  • More accurate measurements
  • Hardened-ball measuring surface with two-point contact
  • Half-ball with a flat bottom
  • Smooth, sensitive adjustment
  • Adjustment of the gage beyond their range is restricted by a safety stop that prevents breakage


  • Range (in): .125-.200"
  • Range (mm): 3.2-5.1mm
  • Length (in): 2-13/16"
  • Length (mm): 70mm


    Member of Kit
    Item #DescriptionPart No.QtyInformation
    10BALL END #831A08865-01
    20ROD, ADJUSTING08876-01
    30NUT,.052-80 ADJ ROD18288-01
    40RING, RETAINING.102X.148X.02118291-01