Description
Product Overview
The Mitutoyo 368-901-10 is a premium 3-Point Internal Micrometer Set (Holtest), designed for the absolute highest precision when measuring the true internal diameter of machined bores, cylinders, and deep holes.
- Self-Centering Accuracy: Unlike standard 2-point bore gauges or telescopic snap gauges that require the operator to perfectly “sweep” the bore to find the true diameter, a 3-point Holtest automatically centers itself. The three contact points extend simultaneously, instantly aligning the tool dead-center for a flawless, repeatable measurement every single time.
- Dual Head Coverage (12-20mm): This complete kit covers a critical size range for precision machining. It includes two separate micrometer heads: 12mm to 16mm and 16mm to 20mm.
- Deep Bore Capable: Need to reach past a shoulder or into a deep cylinder? This set includes the factory extension rod, allowing you to effortlessly drop the measuring head deep into the workpiece while keeping the thimble easily accessible.
- Titanium-Coated Pins: The measuring contact points feature Mitutoyo’s signature titanium coating, providing incredible durability and wear resistance against abrasive materials like cast iron or aerospace alloys.
- Constant Force Ratchet: The built-in ratchet stop ensures a uniform measuring force is applied to the bore walls, completely removing operator “feel” from the equation.
Condition
Used (Great Condition / Lightly Used Complete Set).
These Holtest internal micrometers are in fantastic, lightly used condition. They have clearly been well cared for in a professional environment.
- The Mechanics: The thimbles rotate with buttery smoothness, and the three-point anvils extend and retract flawlessly without sticking.
- Complete Kit: This is a fully ready-to-measure setup. It comes safely housed in its original Mitutoyo fitted wooden case and includes the two micrometer heads, the deep-bore extension rod, the adjustment tools, and the crucial factory setting ring so you can master your tools to absolute zero before inspecting your parts.
Brand Information
Mitutoyo Corporation (Japan) is the undisputed global benchmark for dimensional metrology. Their “Holtest” 3-point internal micrometers are considered the absolute gold standard in the machining industry, trusted by aerospace and medical manufacturers for their unwavering accuracy and robust mechanical longevity.
Specifications
| Feature | Specification |
| Brand | Mitutoyo (Japan) |
| Model | 368-901-10 |
| Type | 3-Point Internal Micrometer (Holtest) Set |
| Total Measuring Range | 12mm – 20mm |
| Included Micrometers | 12-16mm & 16-20mm |
| Graduation | 0.005mm |
| Measuring Contacts | Titanium Coated |
| Included Accessories | Setting Ring, Extension Rod, Spanners, Wood Case |
Keywords
Mitutoyo 368-901-10, 12-20mm Holtest, 3-point internal micrometer, bore micrometer, Mitutoyo bore mic, 12-16mm micrometer, 16-20mm micrometer, internal metrology, machinist measuring tools, Japanese metrology.
