Description
Product Overview
The Mitutoyo 368-003 Holtest is a masterclass in micro-machining metrology. When you are working with microscopic internal diameters where standard bore gauges simply cannot fit, this specialized 2-Point Internal Micrometer provides the absolute highest level of precision and confidence.
- 2-Point Micro Design: Unlike larger Holtests, Mitutoyo engineers their sub-6mm models with a highly specialized 2-point contact system. This allows the anvils to physically fit inside tiny bores while still maintaining true diametrical alignment.
- 3-4mm Range: Covering an incredibly tight 3mm to 4mm measuring range, this tool is strictly designed for micro-machining, watchmaking, aerospace hydraulics, and medical device manufacturing.
- Carbide-Tipped Precision: The tiny measuring contact points are carbide-tipped for exceptional durability and wear resistance against abrasive materials. It delivers an ultra-fine 0.001mm resolution for laboratory-grade inspection.
- Constant Force Ratchet: Working with 3mm holes requires extreme delicacy. The built-in ratchet stop mechanism ensures a uniform, repeatable measuring force is applied to the bore walls, completely removing operator “feel” from the equation and preventing damage to delicate workpieces.
Condition
Used (Like-New Condition / With Test Ring).
This micro-Holtest is in phenomenal, like-new condition. It has clearly been babied in a clean-room or inspection environment and shows virtually no signs of shop-floor wear.
- Mechanical Integrity: The thimble rotates with buttery smoothness, and the two-point anvils extend and retract flawlessly.
- Included: It comes safely housed in its original Mitutoyo fitted case and includes the adjustment spanner. Most importantly, it includes the factory test/setting ring (Not pictured), allowing you to master the micrometer to absolute zero before you take a single critical measurement.
Brand Information
Mitutoyo Corporation (Japan) is the undisputed global benchmark for dimensional metrology. Their “Holtest” internal micrometers are considered the gold standard in the machining industry, trusted by aerospace and medical manufacturers for their unwavering accuracy and robust mechanical longevity—even at microscopic scales.
Specifications
| Feature | Specification |
| Brand | Mitutoyo (Japan) |
| Model | 368-003 |
| Type | 2-Point Internal Micrometer (Holtest) |
| Measuring Range | 3mm – 4mm |
| Graduation | 0.001mm |
| Measuring Contacts | Carbide-Tipped (2-Point) |
| Included Accessories | Setting Ring (Not pictured), Spanner, Case |
Keywords
Mitutoyo 368-003, 3-4mm Holtest, 2-point internal micrometer, micro bore micrometer, Mitutoyo bore mic, internal metrology, machinist measuring tools, Japanese metrology.
