Spi 20-305-9 Ball Contact Point Steel Mitutoyo

Product Description

The SPI 20-305-9 is a ball-style contact point designed for use with dial test indicators in precision measurement applications. The contact tip measures 0.118 inches in diameter and the full contact point length is 0.606 inches. Constructed from steel, this replacement contact point delivers consistent surface contact when checking runout, surface variation, and part alignment on machine tools, surface plates, and inspection fixtures. It is installed by metrology technicians, machinists, and quality control professionals who require repeatable, accurate indicator readings across production and inspection environments.

This contact point is suited for inspection and measurement tasks in manufacturing, machining, and quality assurance settings. It mounts directly to compatible dial test indicators and is appropriate for both shop-floor and lab environments where precise surface contact geometry is required. Typical applications include checking part concentricity, bore alignment, and surface flatness on workpieces held in fixtures or chucks.

Key Features

• Ball-style contact tip provides consistent point contact on curved and irregular surfaces
• 0.118 inch ball diameter for fine-resolution surface measurement
• 0.606 inch contact point length for reach into confined measurement zones
• Steel construction for durability and wear resistance in shop environments
• Direct replacement contact point for compatible test indicators

Compatibility

Designed for use with Mitutoyo test indicators as a direct replacement contact point.

Installation Notes

Contact points are installed and replaced by machinists or metrology technicians using standard indicator contact point wrenches. Ensure the indicator is removed from service before replacing the contact point to avoid damage to the indicator spindle. Thread the contact point in by hand first to avoid cross-threading, then snug with the appropriate wrench — do not overtighten. Verify indicator zero and calibration after any contact point replacement before returning the instrument to service.