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Starrett Small-Bore Gauges
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 gauges are best for measuring near the bottom of flat, shallow bores.
| Measuring Range | Max. Dp. Measured | Material | Manufacturer Model Number | Each | |
Half-Ball Small Bore | |||||
|---|---|---|---|---|---|
| 0.4"-0.5" | 3" | Steel | 831D | 000000 | 000000 |