Spi CMS160809021 Spline Micrometer 0-1 Inch Mechanical

Product Description

The SPI CMS160809021 is a mechanical spline micrometer designed for precision measurement of splined shafts, keyways, and other narrow-profile workpieces that standard anvil micrometers cannot reach. It covers a measurement range of 0 to 1 inch with a resolution and accuracy of 0.0001 inch, making it suitable for close-tolerance inspection work in machining, tool-and-die, and maintenance environments. The 1.26-inch throat depth provides clearance for measuring features recessed from a workpiece edge. A ratchet stop thimble ensures consistent measuring force on every reading, reducing operator-to-operator variation. The unit ships with a case and a short-form certificate of calibration.

This micrometer is used wherever a conventional outside micrometer lacks the throat clearance or spindle geometry to reach internal splines, slots, or narrow-diameter features. It is suited for precision machining shops, quality control benches, and maintenance departments working on gearbox components, drive shafts, and similar mechanical assemblies. The flat spindle type and 0.25-inch spindle diameter allow the measuring faces to seat cleanly on spline lands without rocking. Licensed machinists, toolmakers, and metrology technicians are the primary users.

Key Features

• 0 to 1 inch measurement range with 0.0001 inch graduation and accuracy
• 1.26 inch throat depth for access to recessed or deep-set spline features
• Ratchet stop thimble for repeatable, consistent measuring force
• Flat spindle type with 0.25 inch spindle diameter for spline land contact
• Rotating spindle design with mechanical operation — no battery required
• Ships with protective case and short-form certificate of calibration

Compatibility

Designed as a general-purpose mechanical spline micrometer for inspection of splined shafts, keyways, and narrow-feature workpieces requiring 0 to 1 inch outside measurement capability.

Installation Notes

This instrument requires no installation; it is a handheld metrology tool used at a workbench or inspection station. Before use, verify the zero setting against the calibration certificate and clean the measuring faces with a lint-free cloth. Store in the supplied case when not in use to protect the measuring faces and thimble mechanism from damage. Recalibration intervals should follow the facility quality plan or applicable ISO or ANSI metrology standards.