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    5 Products

    Starrett Small-Bore Gauges

    Image of Product. Half-Ball Gauge. Front orientation. Contains Inset. Bore Gauges. Starrett Small-Bore Gauges, Half-Ball.

    Half-Ball

    Gauge

    Measure the diameter of small holes, grooves, and recesses. The end of these gauges has a 360° contact surface that’s easier to center in tight spaces than anvils or spring-loaded contacts. Use them to measure slots and bores in precision parts, such as electronics, where small size deviations can cause inefficiencies.
    Insert the probe into a bore and turn the knob on the handle to expand the contacts. To find the bore diameter, use a micrometer to measure the distance across the contacts.
    Half-Ball—Half-ball gauges are best for measuring near the bottom of flat, shallow bores.
    Distance Measured
    Range
    Max. Dp.
    Measured
    Material
    Mfr. Model
    No.
    Each
    Half-Ball Small Bore
    0.125" to 0.2"2"Steel831A2205A1000000
    0.2" to 0.3"3"Steel831B2205A200000
    0.3" to 0.4"3"Steel831C2205A300000
    0.4" to 0.5"3"Steel831D2205A400000
     

    Starrett Small-Bore Gauge Sets

    Image of Product. Half-Ball Gauge Set. Front orientation. Contains Inset. Bore Gauges. Starrett Small-Bore Gauge Sets, Half-Ball.

    Half-Ball Gauge Set

    Check a variety of hole, groove, and slot diameters. Each gauge in these sets has a different measuring range. The end of these gauges has a 360° contact surface that’s easier to center in tight spaces than anvils or spring-loaded contacts. Use them to measure slots and bores in precision parts, such as electronics, where small size deviations can cause inefficiencies.
    Insert the probe into a bore and turn the knob on the handle to expand the contacts. To find the bore diameter, use a micrometer to measure the distance across the contacts.
    Half-Ball—Half-ball gauges are best for measuring near the bottom of flat, shallow bores.
    Distance Measured
    Range
    Material
    No. of
    Gauges
    Includes
    Mfr. Model
    No.
    Each
    Half-Ball Small Bore
    0.125" to 0.5"Steel4One half-ball gauge with 0.125"-0.200" measuring range and 2" max. depth
    One half-ball gauge with 0.200"-0.300" measuring range and 3" max. depth
    One half-ball gauge with 0.300"-0.400" measuring range and 3" max. depth
    One half-ball gauge with 0.400"-0.500" measuring range and 3" max. depth    		S831EZ2205A50000000
     
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