General Tools 109 Plunger Dial Indicator 2.5 Inch Face

Product Description

The GENERAL TOOLS 109 is an economy plunger dial indicator designed for precision measurement tasks in machine shop and fabrication environments. The spring-loaded plunger detects surface variation and runout with a resolution of 0.001 inches, making it suitable for setup work on milling machines, lathes, and surface plates. The 2.5-inch diameter dial face rotates to allow zero-setting at any position, and adjustable limit indicators let the technician mark critical reading thresholds. A lug mount on the back of the housing accepts a standard magnetic base or indicator holder for hands-free positioning during inspection.

This dial indicator is used in machine shops, tool rooms, and light manufacturing settings where straightforward dimensional verification is required. Typical applications include checking workpiece flatness, setting up machine tool alignment, verifying concentricity, and inspecting stock for surface defects. It suits machinists, toolmakers, and quality-control technicians working in both job-shop and production environments.

Key Features

• 0.001-inch graduation resolution for fine surface and runout inspection
• 2.5-inch rotatable dial face for flexible zero-setting
• Adjustable limit indicators for marking upper and lower tolerance thresholds
• Rear lug mount compatible with standard magnetic bases and indicator holders
• Economy-grade construction suitable for general shop inspection use

Compatibility

Designed as a standard plunger-style dial indicator for use with universal magnetic base holders, indicator arms, and surface plate fixtures that accept a rear lug mount.

Installation Notes

Mount the indicator using the rear lug to a magnetic base or indicator arm before securing the base to the machine table or surface plate. Ensure the plunger axis is perpendicular to the surface being measured to avoid cosine error in readings. Power down and lock out any machine tool before positioning the indicator against a rotating or moving component. Installation and calibration work of this type is typically performed by machinists or toolmakers following shop-standard metrology practices.

Technical Specifications

• Graduation Resolution: 0.001 inches
• Dial Face Diameter: 2.5 inches
• Weight: 13.8 pounds
• UPC: 038728109002

Standard Information

• Brand: GENERAL TOOLS
• Manufacturer Part Number: 109