The Mitutoyo Holtest mechanical three-point internal micrometer utilizes three self-centering anvils with precision contact points for accurate and efficient measurements of inside dimensions of bores.
Series 368
Mechanical Holtest Three-Point/Two-Point Internal Micrometers
Features & Benefits
The Mitutoyo mechanical Holtest internal micrometer features three hardened-steel anvils evenly spaced at 120° for true alignment of the axis bore for accurate, easily repeatable measurements. Contact points are coated with Titanium Nitride (TiN)* for added durability and precision. The holtest’s ratchet stop mechanism provides a constant measuring force on the hardened-steel spindle to ensure accurate, even measurements.
- Available in Metric and Inch models
- Optional extension rod allows for measuring deep holes
- Optional setting rings for zero point adjustment are available
- 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
* Models under 5-6mm / .24-.28″ are carbide
SERIES 368 Technical Data
| Technology: | Mechanical |
|---|---|
| Ratchet/Thimble: | Ratchet Stop |
Product List
| Order No.: | Product Image: | Units: | Range: | Graduation: | Accuracy: | Mass: | Contact Point: | Measuring Method: | Extension Rod (Optional): |
|---|---|---|---|---|---|---|---|---|---|
| 368-001 |  |
Metric | 2 - 2.5mm | 0.001mm | ±2µm | 88g | Carbide | Two-Point method | - |
| 368-002 | - | Metric | 2.5 - 3mm | 0.001mm | ±2µm | 88g | Carbide | Two-Point method | - |
| 368-003 | - | Metric | 3 - 4mm | 0.001mm | ±2µm | 91g | Carbide | Two-Point method | - |
| 368-004 | - | Metric | 4 - 5mm | 0.001mm | ±2µm | 91g | Carbide | Two-Point method | - |
| 368-005 | - | Metric | 5 - 6mm | 0.001mm | ±2µm | 91g | Carbide | Two-Point method | - |
| 368-021 | - | Inch | .08-0.1" | 0.0001" | ±0.0001" | 88g | Carbide | Two-Point method | - |
| 368-022 | - | Inch | 1-0.12" | 0.0001" | ±0.0001" | 88g | Carbide | Two-Point method | - |
| 368-023 |  |
Inch | 12-0.16" | 0.0001" | ±0.0001" | 91g | Carbide | Two-Point method | - |
| 368-024 |  |
Inch | 16-0.2" | 0.0001" | ±0.0001" | 91g | Carbide | Two-Point method | - |
| 368-025 |  |
Inch | 2-0.24" | 0.0001" | ±0.0001" | 91g | Carbide | Two-Point method | - |
| 368-026 |  |
Inch | 24-0.28" | 0.0001" | ±0.0001" | 91g | Carbide | Two-Point method | - |
| 368-161 | - | Metric | 6 - 8mm | 0.001mm | ±3µm | 57g | TiN coating | Three-point method | 952322 |
| 368-162 | - | Metric | 8 - 10mm | 0.001mm | ±3µm | 58g | TiN coating | Three-point method | 952322 |
| 368-163 | - | Metric | 10 - 12mm | 0.001mm | ±3µm | 59g | TiN coating | Three-point method | 952322 |
| 368-164 | - | Metric | 12 - 16mm | 0.005mm | ±3µm | 140g | TiN coating | Three-point method | 952621 |
| 368-165 | - | Metric | 16 - 20mm | 0.005mm | ±3µm | 145g | TiN coating | Three-point method | 952621 |
| 368-166 | - | Metric | 20 - 25mm | 0.005mm | ±3µm | 250g | TiN coating | Three-point method | 962622 |
| 368-167 | - | Metric | 25 - 30mm | 0.005mm | ±3µm | 270g | TiN coating | Three-point method | 962622 |
| 368-168 |  |
Metric | 30 - 40mm | 0.005mm | ±3µm | 290g | TiN coating | Three-point method | 962622 |
| 368-169 | - | Metric | 40 - 50mm | 0.005mm | ±3µm | 330g | TiN coating | Three-point method | 962622 |
| 368-170 | - | Metric | 50 - 63mm | 0.005mm | ±3µm | 440g | TiN coating | Three-point method | 952623 |
| 368-171 | - | Metric | 62 - 75mm | 0.005mm | ±4µm | 450g | TiN coating | Three-point method | 952623 |
| 368-172 | - | Metric | 75 - 88mm | 0.005mm | ±4µm | 490g | TiN coating | Three-point method | 952623 |
| 368-173 | - | Metric | 87 - 100mm | 0.005mm | ±4µm | 500g | TiN coating | Three-point method | 952623 |
| 368-174 |  |
Metric | 100 - 125mm | 0.005mm | ±5µm | 1050g | TiN coating | Three-point method | 952623 |
| 368-175 | - | Metric | 125 - 150mm | 0.005mm | ±5µm | 1120g | TiN coating | Three-point method | 952623 |
| 368-176 | - | Metric | 150 - 175mm | 0.005mm | ±5µm | 1190g | TiN coating | Three-point method | 952623 |
| 368-177 | - | Metric | 175 - 200mm | 0.005mm | ±5µm | 1260g | TiN coating | Three-point method | 952623 |
| 368-178 | - | Metric | 200 - 225mm | 0.005mm | ±6µm | 1420g | TiN coating | Three-point method | 952623 |
| 368-179 | - | Metric | 225 - 250mm | 0.005mm | ±6µm | 1580g | TiN coating | Three-point method | 952623 |
| 368-180 | - | Metric | 250 - 275mm | 0.005mm | ±6µm | 1600g | TiN coating | Three-point method | 952623 |
| 368-181 | - | Metric | 275 - 300mm | 0.005mm | ±6µm | 1690g | TiN coating | Three-point method | 952623 |
| 368-261 | - | Inch | .275-0.35" | 0.0001" | ±0.0001" | 57g | TiN coating | Three-point method | 952322 |
| 368-262 | - | Inch | 35-0.425" | 0.0001" | ±0.0001" | 58g | TiN coating | Three-point method | 952322 |
| 368-263 | - | Inch | .425-0.5" | 0.0001" | ±0.0001" | 59g | TiN coating | Three-point method | 952322 |
| 368-264 |  |
Inch | 5-0.65" | 0.0002" | ±0.00015" | 140g | TiN coating | Three-point method | 952621 |
| 368-265 |  |
Inch | .65-0.8" | 0.0002" | ±0.00015" | 145g | TiN coating | Three-point method | 952621 |
| 368-266 | - | Inch | 8-1" | 0.0002" | ±0.00015" | 250g | TiN coating | Three-point method | 962622 |
| 368-267 | - | Inch | 1-1.2" | 0.0002" | ±0.00015" | 270g | TiN coating | Three-point method | 962622 |
| 368-268 | - | Inch | 1.2-1.6" | 0.0002" | ±0.00015" | 290g | TiN coating | Three-point method | 962622 |
| 368-269 | - | Inch | 1.6-2" | 0.0002" | ±0.00015" | 330g | TiN coating | Three-point method | 962622 |
| 368-270 | - | Inch | 2-2.5" | 0.0002" | ±0.00015" | 440g | TiN coating | Three-point method | 952623 |