Spi CMS160725107 Dial Drop Indicator 0.25 in Nist

Product Description

The SPI CMS160725107 is a dial drop indicator designed for precision dimensional measurement in industrial, machining, and quality-control applications. It delivers a total measurement range of 0.25 inches with a 0-50-0 bidirectional dial reading and a fine graduation of 0.001 inches per division, allowing technicians to detect very small deviations in surface height, runout, or part alignment. The 2.2-inch white dial face improves readability in production environments, while the built-in revolution counter helps the user track total travel across multiple dial rotations. Accuracy is rated at 0.002 inches, and the unit ships with a NIST traceability certification included.

This indicator is suited for use on inspection fixtures, surface plates, machining centers, and lathes in both job-shop and production settings. Its 3/8-inch stem diameter is compatible with standard magnetic bases, articulating arms, and indicator holders commonly used in metalworking and precision measurement setups. The 0.1-inch range per revolution makes it well-suited for applications where close-tolerance measurement is required without frequent resetting. Machinists, quality technicians, and tool-and-die professionals are the primary installers and users of this instrument.

Key Features

• 0.25-inch total measurement range with 0.001-inch graduation for fine resolution
• 0-50-0 bidirectional dial reading simplifies plus-and-minus deviation measurement
• Built-in revolution counter tracks cumulative travel across dial rotations
• 2.2-inch white dial face designed for easy reading in shop environments
• NIST traceability certification included for quality and compliance documentation
• 3/8-inch stem diameter fits standard indicator holders and magnetic bases

Compatibility

Designed as a standard drop indicator for use with conventional 3/8-inch stem diameter indicator holders, magnetic bases, and articulating arm assemblies common in precision measurement and machining applications.

Installation Notes

Installation is performed by machinists or quality technicians using a standard indicator holder or magnetic base that accepts a 3/8-inch stem. Ensure the stem is clamped securely without excessive force that could distort the stem or affect gauge repeatability. Position the indicator so the contact point approaches the workpiece surface at a perpendicular angle to minimize cosine error. Handle the instrument carefully to avoid shock or drop damage, which can affect calibration and accuracy.