56B Small Surface Gage 50290

Starrett Surface Gages are designed for a wide variety of uses. This is a basic tool for machinists and toolmakers. The main uses are for accurately scribing lines, transferring measurements and for probing surfaces in inspection work. (2) 4"/7" Spindle, 2" x 1 1/2" Base.

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  • Smaller base and spindle than other surface gages and is designed for lighter work
  • Two frictionally held gage pins in the steel base which can be pushed down and used against the edge of a surface plate or T-slot for linear work
  • Weighs only ten ounces (.28kg.) and takes up very little space in a toolbox
  • Only 1-3/8" (35mm) high, including the lower sleeve in the rocker arm
  • Scriber has a 3/32" (2.4mm) diameter and is 3-1/4" (82mm) long


  • Spindle Length (in): Two, 4" & 7"
  • Spindle Length (mm): 100 & 175mm
  • Base Size (in): 2" x 1-1/2"
  • Base Size (mm): 50 x 38mm


    Member of Kit
    Item #DescriptionPart No.QtyInformation
    10BASE #5607778-01
    20SPINDLE, #56-4"PT991311
    30•SPINDLE, 4"01807-01
    40•SCREW, .125-40 SLOT X .266 LONG01831-01
    50SPINDLE, #56-7"PT991211
    60•SPINDLE, 7"01808-01
    70•SCREW, .125-40 SLOT X .266 LONG01831-01
    80SPINDLE SLEEVE #56PT990851
    90•BOLT, SPINDLE #5607785-01
    120•SPRING, .161X.203X.250X.021X301818-01
    130•NUT, .150-3601825-01
    150SCRIBER SLEEVE #56PT990321
    170•RING, SNUG FRICTION01827-01
    180•BOLT, SCRIBER #5607787-01
    200•SPRING, .116X.148X.156X.016X301826-01
    210•NUT, .110-5201816-01
    230SPRING, .147X.233X.625X.043X601823-01
    240SCREW, .125-40 THUMB X .563 LONG07779-01
    250SCREW, .200-40 SLOT X .439 LONG07781-01
    260SCREW, .157-40 SET X .123 LONG08733-01
    270PIN, BASE GUIDE07782-02
    280SPRING, GUIDE PIN07783-02