831B Small Hole Gage 53084

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. .200-.300" (5.1-7.6mm) Range, 3 1/8" (80mm) 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): .200-.300"
  • Range (mm): 5.1-7.6mm
  • Length (in): 3-1/8"
  • Length (mm): 80mm


    Member of Kit
    Item #DescriptionPart No.QtyInformation
    10BALL END #831B08866-01
    20ROD, ADJUSTING08877-01
    30NUT, ADJUSTING ROD18289-01
    40RING, RETAINING.102X.148X.02118291-01