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Mitutoyo Series 368 Holtest
Three-Point/Two-Point Internal Micrometers
These Holtests are versatile, self-centering three-point internal micrometers for the accurate and efficient direct-measurement of internal diameters. Three anvils, evenly spaced at 120° apart, contact the internal wall surfaces and find true alignment with the axis of the bore for accurate ID measurement.
FEATURES
- TiN-coated measuring contact points (over 6mm / .275” range models) provide excellent durability and impact resistance and allow the instrument to measure to the bottom of a blind hole (up to 100mm / 4”models).
- Highly durable because of carbide-tipped contact points (anvils up to 12mm / .5”models).
- Measure deep holes using an extension rod (optional) which is available on models over 6mm (.275″) measuring range.
- With Ratchet Stop for constant force.
- Setting rings for zero point adjustment are optional.
- Supplied in fitted plastic case up to 100mm / 4”. Over 100mm / 4” supplied in wooden case.
Download: Mitutoyo Series 368 Data Sheet
SPECIFICATIONS
Metric Individual (* with TiN-coated contact points)
| Range | Order No. | Accuracy | |
| 2 – 2.5mm | 368-001 | ±2µm | |
| 2.5 – 3mm | 368-002 | ±2µm | |
| 3 – 4mm | 368-003 | ±2µm | |
| 4 – 5mm | 368-004 | ±2µm | |
| 5 – 6mm | 368-005 | ±2µm | |
| 6 – 8mm | *368-161 | ±2µm | |
| 8 – 10mm | *368-162 | ±2µm | |
| 10 – 12mm | *368-163 | ±2µm | |
| 12 – 16mm | *368-164 | ±2µm | |
| 16 – 20mm | *368-165 | ±2µm | |
| 20 – 25mm | *368-166 | ±3µm | |
| 25 – 30mm | *368-167 | ±3µm | |
| 30 – 40mm | *368-168 | ±3µm | |
| 40 – 50mm | *368-169 | ±3µm | |
| 50 – 63mm | *368-170 | ±3µm | |
| 62 – 75mm | *368-171 | ±3µm | |
| 75 – 88mm | *368-172 | ±3µm | |
| 87 – 100mm | *368-173 | ±3µm | |
| 100 – 125mm | *368-174 | ±5µm | |
| 125 – 150mm | *368-175 | ±5µm | |
| 150 – 175mm | *368-176 | ±5µm | |
| 175 – 200mm | *368-177 | ±5µm | |
| 200 – 225mm | *368-178 | ±5µm | |
| 225 – 250mm | *368-179 | ±5µm | |
| 250 – 275mm | *368-180 | ±5µm | |
| 275 – 300mm | *368-181 | ±5µm | |
Inch Individual (* with TiN-coated contact points)
| Range | Order No. | Accuracy | |
| .08 – .1″ | 368-021 | ±.0001″ | |
| .1 – .12″ | 368-022 | ±.0001″ | |
| .12 – .16″ | 368-023 | ±.0001″ | |
| .16 – .2″ | 368-024 | ±.0001″ | |
| .2 – .24″ | 368-025 | ±.0001″ | |
| .24 – .28″ | 368-026 | ±.0001″ | |
| .275 – .35″ | *368-261 | ±.0001″ | |
| .35 – .425″ | *368-262 | ±.0001″ | |
| .425 – .5″ | *368-263 | ±.0001″ | |
| .5 – .65″ | *368-264 | ±.0001″ | |
| .65 – .8″ | *368-265 | ±.0001″ | |
| .8 – 1″ | *368-266 | ±.00015″ | |
| 1 – 1.2″ | *368-267 | ±.00015″ | |
| 1.2 – 1.6″ | *368-268 | ±.00015″ | |
| 1.6 – 2″ | *368-269 | ±.00015″ | |
| 2 – 2.5″ | *368-270 | ±.00015″ | |
| 2.5 – 3″ | *368-271 | ±.00015″ | |
| 3 – 3.5″ | *368-272 | ±.00015″ | |
| 3.5 – 4″ | *368-273 | ±.00015″ | |
| 4 – 5″ | *368-274 | ±.00025″ | |
| 5 – 6″ | *368-275 | ±.00025″ | |
| 6 – 7″ | *368-276 | ±.00025″ | |
| 7 – 8″ | *368-277 | ±.00025″ | |
| 8 – 9″ | *368-278 | ±.00025″ | |
| 9 – 10″ | *368-279 | ±.00025″ | |
| 10 – 11″ | *368-280 | ±.00025″ | |
| 11 – 12″ | *368-281 | ±.00025″ | |
Complete Unit Set
Each set includes complete gages (micrometer head units and measuring heads for each size).
Metric (* with TiN-coated contact points)
| Range | Order No. | Individual range | Setting rings included | Remarks |
| 2 – 3mm | 368-906 | 2-2.5, 2.5-3mm | ø2.5mm | — |
| 3 – 6mm | 368-907 | 3-4, 4-5, 5-6mm | ø4mm, ø5mm | — |
| 6 – 12mm | *368-911 | 6-8, 8-10, 10-12mm | ø8mm, ø10mm | with extension rod |
| 12 – 20mm | *368-912 | 12-16, 16-20mm | ø16mm | with extension rod |
| 20 – 50mm | *368-913 | 20-25, 25-30, 30-40, 40-50mm | ø25mm, ø40mm | with extension rod |
| 50 – 100mm | *368-914 | 50-63, 62-75, 75-88, 87-100mm | ø62mm, ø87mm | with extension rod |
| 100 – 200mm | *368-915 | 100-125, 125-150, 150-175, 175-200mm | ø125mm, ø175mm | with extension rod |
Inch (* with TiN-coated contact points)
| Range | Order No. | Individual range | Setting rings included | Remarks |
| .08″ – .12″ | 368-926 | .08-.1″, .1-.12″ | .1″ DIA. | — |
| .12″ – .28″ | 368-927 | .12-.16″, .16-.2″, .2-.24″, .24-.28″ | .16″ DIA., .24″ DIA. | — |
| .275″ – .5″ | *368-916 | .275-.35″, .35-.425″, .425-.5″ | .35″ DIA., .5″ DIA. | with extension rod |
| .5″ – .8″ | *368-917 | .5-.65″, .65-.8″ | .65″ DIA. | with extension rod |
| .8″ – 2″ | *368-918 | .8-1″, 1-1.2″, 1.2-1.6″, 1.6-2″ | 1″ DIA., 1.6″ DIA. | with extension rod |
| 2″ – 4″ | *368-919 | 2-2.5″, 2.5-3″, 3-3.5″, 3.5-4″ | 2.5″ DIA., 3.5″ DIA. | with extension rod |
| 4″ – 8″ | *368-920 | 4-5″, 5-6″, 6-7″, 7-8″ | 5″ DIA., 7″ DIA. | with extension rod |
Note : .0001” graduation
| Brand | MITUTOYO |
|---|
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