Spi CMS160725075 Mechanical Disc Micrometer 2-3 in

Product Description

The SPI CMS160725075 is a mechanical disc micrometer designed for precision outside measurement in the 2 to 3 inch range. It uses a ratchet stop thimble to apply consistent measuring pressure, helping eliminate operator-induced variation during repeated measurements. The spindle diameter measures 0.31 inches, and the disc face diameter is 0.79 inches, making it well suited for measuring thin-walled parts, grooves, and disc-shaped workpieces that standard anvil micrometers cannot contact cleanly. Resolution is 0.0001 inches with an accuracy rating of 0.0002 inches. Both the anvil and spindle are steel construction. A NIST Traceability Certificate of Calibration is included. This tool is used by machinists, metrology technicians, and quality control professionals.

The CMS160725075 is appropriate for shop floor and inspection room use wherever thin disc or groove geometry requires a flat-faced measuring surface rather than a standard ball or flat anvil. The ratchet stop thimble makes it suitable for high-repetition measurement tasks where consistent feel and repeatable results are critical. It is packaged individually and ships with a protective case and short-form certificate of calibration traceable to NIST standards.

Key Features

• Measuring range: 2 to 3 inches for outside dimensions
• Resolution of 0.0001 inches for fine-tolerance measurement
• Accuracy rated at 0.0002 inches
• Ratchet stop thimble ensures consistent measuring force
• 0.79-inch disc face contacts thin workpieces that standard anvils cannot reach
• Steel anvil and spindle construction for wear resistance
• NIST Traceability Certification included with case and calibration certificate

Compatibility

Designed as a standalone precision measurement instrument for outside diameter and disc geometry measurement in the 2 to 3 inch range. No specific machine or system compatibility applies.

Installation Notes

This micrometer requires no installation. Before use, verify the calibration certificate is current and store the instrument in the supplied case when not in use. Do not over-tighten the thimble against the workpiece; use the ratchet stop exclusively to apply measuring force. Periodic cleaning of the anvil and spindle faces with a lint-free cloth is recommended to maintain measurement accuracy.