Spi CMS160725072 Disc Micrometer 1-2 in Ratchet Nist

Product Description

The SPI CMS160725072 is a mechanical disc micrometer designed for precision outside measurement in the 1 to 2 inch range. It uses a rotating spindle with a ratchet stop thimble to deliver consistent, repeatable seating force on each measurement. The disc face measures 0.79 inches in diameter and is made from steel, making it suited for measuring thin-walled parts, sheet stock, and similar workpieces where a standard flat anvil would rock. Resolution is 0.0001 inches with an accuracy rating of 0.0002 inches. A NIST traceability certificate ships with the unit, satisfying documentation requirements in calibrated shop environments.

This micrometer is intended for use in precision machining, metrology labs, and quality-control applications where standard anvil geometry is not adequate. The disc design allows access to grooves, ribs, and recessed features on turned or stamped parts. It is appropriate for tool-and-die, aerospace fabrication, and general manufacturing inspection work. The painted finish provides basic corrosion resistance for typical shop conditions. Installation is performed by a calibration technician or qualified metrologist and requires no special tools beyond the instrument itself.

Key Features

• 1 to 2 inch measuring range with 0.0001 inch graduation
• Accuracy of 0.0002 inches for high-precision dimensional inspection
• 0.79 inch steel disc anvil for measuring thin, slotted, or recessed features
• Ratchet stop thimble delivers controlled, consistent measuring force
• Rotating spindle allows smooth advancement to workpiece contact
• Includes carrying case and NIST traceable certificate of calibration

Compatibility

Designed as a direct-use precision instrument for outside measurements in the 1 to 2 inch range. Compatible with standard metrology workflows requiring NIST traceable documentation.

Installation Notes

Handle with clean, dry hands or lint-free gloves to prevent corrosion from skin oils on the spindle and anvil surfaces. Store in the included case when not in use to protect calibration and disc geometry. Do not exceed the rated measuring range, as forcing the spindle beyond its travel can damage the thread mechanism. Recalibration intervals should follow shop QC procedures or applicable ISO measurement system standards.