Spi CMS160809110 Mechanical Depth Micrometer 4 in

Product Description

The SPI CMS160809110 is a mechanical depth micrometer designed for precise depth measurement in machining, tooling, and inspection applications. It covers a maximum measurement range of 4 inches using a set of four interchangeable rotating rods, each with a diameter of 0.176 inches (4.50 mm). The ratchet stop thimble ensures consistent measuring pressure, reducing operator-to-operator variation. Graduation is 0.001 inches with an accuracy of 0.0002 inches, making it suitable for close-tolerance work. The measuring faces are hardened steel for long service life. The unit ships NIST certified and includes a short-form certificate of calibration.

This depth micrometer is used in metal fabrication shops, machine shops, toolrooms, and quality control environments where accurate depth readings are required for bores, slots, steps, and shoulders. The 2.25-inch base length provides stable seating across a range of workpiece geometries. Machinists, tool and die makers, quality technicians, and metrologists are the primary users. The included case keeps all four rods and accessories organized between uses.

Key Features

• 4-inch maximum measurement range with four interchangeable rotating rods
• Ratchet stop thimble for consistent, repeatable measuring force
• 0.001-inch graduation with 0.0002-inch accuracy
• Hardened steel measuring faces for durability in production environments
• NIST certified with short-form certificate of calibration included
• 2.25-inch base length for stable contact on workpiece surfaces
• Includes carrying case and torque wrench for rod changes

Compatibility

Designed as a general-purpose mechanical depth micrometer for use with standard inch-system depth measurement tasks; compatible with any setup requiring 0 to 4-inch depth range coverage via interchangeable rod extension.

Installation Notes

Depth micrometers should be handled and stored by qualified inspection or machining personnel following standard metrology practices. Before use, clean the base and rod faces with a lint-free cloth and verify the zero setting against a reference surface. Do not overtighten the rod lock nut; use the included torque wrench for rod changes to avoid damaging the spindle thread. Recalibrate periodically per your facility quality management schedule to maintain NIST traceability.