Mitutoyo 139167 Extension Rod Precision Measuring

Product Description

The MITUTOYO 139167 is an extension rod accessory designed to extend the reach of drop indicators and other precision measuring instruments. This rod allows technicians to position the measuring contact at greater depths or distances than the standard spindle travel permits, making it useful when measuring recessed surfaces, deep bores, or hard-to-reach features. Machined to maintain measurement accuracy, it connects directly to compatible drop indicator spindles. Metrology technicians, quality control inspectors, and precision machinists install this type of accessory as part of a complete measurement setup on surface plates, CMM fixtures, or dial indicator holders.

This extension rod is suited for use in precision measurement applications across industrial, manufacturing, and quality assurance environments. It is compatible with drop indicators and precision measuring tools and instruments where additional spindle reach is required. The accessory is sold individually and is not calibrated or supplied with a traceability certificate, so it is intended as a mechanical extension rather than a certified measurement artifact.

Key Features

• Extends the effective reach of drop indicator spindles for deep or recessed measurements
• Designed for use with precision measuring tools and instruments
• Sold as a single unit with a minimum order quantity of one
• Not calibrated — functions as a mechanical extension accessory
• No traceability certification included

Compatibility

Designed as a drop indicator extension rod accessory for use with precision measuring tools and instruments. Confirm spindle thread size and stem diameter compatibility with your specific drop indicator model before installation.

Installation Notes

Installation is performed by metrology technicians or qualified machinists. Before attaching or removing the extension rod, ensure the drop indicator is dismounted from any active fixture to prevent accidental contact damage to the instrument. Verify that the thread engagement is secure and that no lateral load is applied to the extension during measurement, as side forces can introduce error. Follow the instrument manufacturer guidelines for maximum spindle extension length to avoid exceeding measurement accuracy specifications.