Mitutoyo 250-301 Micrometer Head 25mm Digital Counter

Product Description

The MITUTOYO 250-301 is a mechanical micrometer head with an integrated digital counter display, designed for precise linear measurement and positioning in metrology, machining, and instrumentation applications. It offers a 25mm measuring range with an accuracy of 2 micrometers, making it suitable for high-precision work where reliable, repeatable positioning is required. The head features a carbide measuring face for wear resistance and a ratchet stop thimble that delivers consistent measuring force. The chrome-plated finish resists corrosion during regular shop use. Machinists, metrologists, and precision instrument technicians are the primary installers and users of this component.

The MITUTOYO 250-301 is used in applications requiring accurate linear displacement control, including fixtures, jigs, optical stages, and precision machine tool setups. Its 18mm diameter thimble with ratchet stop allows controlled, repeatable spindle advancement. The flat spindle tip is suited for contact with flat or near-flat workpiece surfaces. The 10mm diameter by 15mm long stem provides a standard mounting interface for incorporation into custom fixtures or commercial stages. This head is appropriate for both laboratory and production floor environments where 2-micrometer accuracy is the operational requirement.

Key Features

• Mechanical digital counter display provides direct reading without analog interpolation
• 2-micrometer accuracy across the full 25mm measuring range
• Carbide measuring face resists wear during high-cycle use
• Ratchet stop thimble ensures consistent, repeatable contact force
• Flat spindle geometry suits planar surface contact applications
• Chrome-plated body finish for corrosion resistance in shop environments

Compatibility

Designed as a standard micrometer head for integration into precision fixtures, positioning stages, and custom measurement tooling that accept a 10mm diameter stem mount.

Installation Notes

Installation is typically performed by machinists or metrology technicians using standard lathe or fixture clamping hardware sized to the 10mm stem diameter. Ensure the stem bore in the host fixture is clean and free of burrs before seating the head to avoid measurement error introduced by misalignment. Do not exceed the rated measuring range when advancing the spindle, as forcing the mechanism beyond its travel can damage the counter assembly. Follow the equipment manufacturer's guidelines for clamping torque on the stem to avoid distorting the head body.