Overview
Mitutoyo 149-812 is a small-size micrometer head designed for precision measurement and stage positioning. This Series 149 unit features a spherical carbide-tipped spindle and 0 to 0.5 inch measuring range, making it ideal for CNC, inspection, and metalworking applications requiring repeatable, accurate adjustments.
Key Features
- Spherical carbide-tipped measuring face for durability and precision
- Hard-chrome plated thimble with laser-etched scale for easy reading
- Precision-lapped spindle face for flat, consistent contact
- Clamp nut assembly for secure fixture mounting
- Compact 15mm body diameter—ideal for confined gauge setups
Technical Specifications
- Measurement Range: 0 to 0.5 inch
- Accuracy: ±0.0001 inch
- Graduations: 0.001 inch
- Spindle Pitch: 0.5mm
- Spindle Diameter: 0.375 inch
- Main Body Diameter: 15mm
- Overall Length: 75.5mm
- Spindle Tip Material: Tungsten Carbide
- Scale Surface: Hard Chrome Plating
- Weight: 60g
- System: Imperial (inch)
Typical Applications
- Precision stage height adjustments on CNC and manual machines
- Fine-tolerance inspection and dimensional verification
- Gauge block and tooling offset measurement
- Manual positioning for tool setters and work-holding fixtures
- Manufacturing and quality control in metalworking shops
Compatibility & Replacements
Compatible With
- Standard universal base plates and granite surface plates
- Mitutoyo and third-party gauge stands, spindle fixtures, and inspection setups
- Manual and CNC machine tool retrofit applications with clamp-nut mounting
- Height gauge blocks, optical comparators, and coordinate measurement systems
Replaces / Drop-In Replacement For
- Mitutoyo 149-812 original equipment (direct replacement)
- Earlier carbide-tipped heads in the Series 149 inch range (0-0.5″)
- Worn or damaged small-size micrometer heads with similar 15mm body diameter
Works With
- Mitutoyo Series 149 carbide-tipped micrometer head ecosystem
- Standard 0.375 inch diameter spindle stems and plain/clamp-nut adapters
- Manual measurement and CNC probe offset workflows
- Mitutoyo base plates, mounting blocks, and accessory fixtures
