Mitutoyo, 368-913, Mechanical Holtest Three-Point Internal Micrometers, 4 Gage Set 20-50mm
Features:
- Optional extension rod allows for measuring deep holes
- Scale on thimble and sleeve is laser etched for easier reading in all conditions
- Holtests up to 100mm / 4″ diameter measurements supplied in a fitted plastic case
- Holtests over 100mm / 4″ diameter measurements supplied in a wooden case
The Mitutoyo mechanical Holtest internal micrometer set includes complete gages (micrometer head units and measuring heads) for each size. Three hardened-steel anvils evenly spaced at 120° allow for true alignment of the axis bore for accurate, easily repeatable measurements. The holtest’s ratchet stop mechanism provides a constant measuring force on the hardened-steel spindle to ensure accurate, even measurements.
Technical Details
| Technology: | Mechanical |
| Ratchet/Thimble: | Ratchet Stop |
| Contact Point: | TiN coating |
| Measuring Method: | Three-point method |
| Units: | Metric |
| Range: | 20 – 50mm |
| Graduation: | 0.005mm |
| Accuracy: | ±3µm |
| Setting rings included: | 25, 40 |
| Individual Range: | 20-25, 25-30, 30-40, 40-50mm |
| Remarks: | with extension rod |





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