Spi CMS160809152 Outside Micrometer 3 Inch Ratchet Stop

Product Description

The SPI CMS160809152 is a mechanical outside micrometer designed for precise linear measurement of external dimensions. It covers a 3-inch measurement range with a graduation of 0.0001 inches and an accuracy of 0.0002 inches, making it suitable for close-tolerance work in fabrication, machining, and mechanical service environments. The thimble uses a ratchet stop mechanism to deliver consistent measuring force, and a digital counter aids in fast, accurate reading. Measuring faces are solid carbide for durability and wear resistance. The unit ships calibrated with NIST traceability documentation included.

This micrometer is suited for use in machine shops, mechanical contracting, HVAC equipment manufacturing, and any trade application requiring verified dimensional inspection of shafts, fittings, tubing walls, or machined components. The ratchet stop thimble makes it practical for repeated measurements where operator-applied pressure variation would otherwise introduce error. The included case and certificate of calibration support tool accountability on job sites or in service departments subject to quality audits.

Key Features

• 3-inch measurement range with 0.0001-inch graduation for high-resolution readings
• Accuracy of 0.0002 inches suitable for close-tolerance dimensional checks
• Ratchet stop thimble provides repeatable, consistent measuring force
• Solid carbide measuring faces resist wear over extended service life
• Digital counter for fast reading without interpolation errors
• NIST traceability certification and short-form calibration certificate included
• Satin chrome finish reduces glare and corrosion in shop environments

Compatibility

Designed as a general-purpose outside micrometer for standard inch-system measurement tasks across mechanical, manufacturing, and trade service applications.

Installation Notes

Outside micrometers require no installation but should be handled and stored according to metrology best practices. Always zero the tool before use and verify calibration if the instrument has been dropped or subjected to impact. Store in the included case when not in use to protect the measuring faces and thimble. Calibration should be verified periodically against gauge blocks or returned to a calibration lab to maintain NIST traceability.