Spi CMS160713033 Mechanical Hole Micrometer

Product Description

The SPI CMS160713033 is a mechanical hole micrometer designed for precise internal bore measurement in the range of 0.4250 to 0.5000 inches. It delivers a graduation and accuracy of 0.0001 inches (0.002 mm), making it suitable for tight-tolerance work in machining, manufacturing, and maintenance applications. The ratchet stop thimble provides consistent measuring pressure, and three self-centering carbide contact points ensure repeatable, accurate readings without operator-induced error. A chrome finish resists corrosion and wear during regular shop use. NIST traceability certification is included for quality-system compliance. Machinists, tool-and-die makers, and precision maintenance technicians are the primary users of this instrument.

This hole micrometer is applied in situations where accurate internal diameter measurement is required for bores, holes, and cylindrical features in the 0.4250 to 0.5000 inch range. It is well suited for use in precision manufacturing facilities, machine shops, and quality control environments. The included extension rod extends measurement reach up to 4.0000 inches in depth, and the included setting ring (0.5000 inch diameter) allows the instrument to be zeroed before use. The gage depth reaches 2.1100 inches, accommodating a variety of workpiece configurations.

Key Features

• Measurement range: 0.4250 to 0.5000 inches with 0.0001 inch graduation
• Accuracy of 0.0001 inches (0.002 mm) for tight-tolerance inspection
• Ratchet stop thimble ensures consistent, repeatable measuring force
• Three self-centering carbide contact points for stable, accurate internal readings
• NIST traceability certification included for quality and calibration records
• Includes one extension rod (up to 4.0000 inches) and one setting ring (0.5000 inch diameter)

Compatibility

Designed as a direct-use precision measuring instrument for internal bore and hole measurement applications requiring a range of 0.4250 to 0.5000 inches; compatible with standard metrology workflows that require NIST-traceable calibration documentation.

Installation Notes

This instrument is used by machinists and quality technicians and does not require permanent installation. Before use, zero the micrometer using the included setting ring on a clean, stable surface. Handle carbide contact points with care to avoid chipping or contamination that could affect accuracy. Store in the provided case when not in use to protect the measuring surfaces and maintain calibration integrity.