Spi 20-985-8 Ball Contact Point Dial Indicators

Product Description

The SPI 20-985-8 is a ball-style contact point designed for use with dial indicators in precision measurement applications. Machined from chrome alloy steel, this contact point measures 0.75 inches in length with a ball diameter of 0.4063 inches. It threads directly onto compatible dial indicators using a 4-48 thread. Machinists, calibration technicians, and tool room professionals rely on this type of contact point when measuring workpieces that require consistent ball-tip contact across curved or irregular surfaces. The chrome alloy steel construction provides durability and resistance to wear under repeated measuring cycles.

This contact point is suited for inspection and measurement setups in manufacturing, tooling, and quality control environments. It conforms to the AGD Group 1 industry designation, making it appropriate for standard AGD-compliant dial indicators used in both production and bench settings. Its compact size and standard thread make it a practical replacement or spare for everyday indicator use.

Key Features

• Ball-style contact tip for consistent contact on curved and irregular surfaces
• Chrome alloy steel construction for durability and wear resistance
• 0.75 inch contact point length for standard reach applications
• Ball diameter of 0.4063 inches for broad surface contact
• 4-48 thread size for direct installation on compatible dial indicators
• Meets AGD Group 1 industry designation

Compatibility

Designed for use with dial indicators accepting a 4-48 threaded contact point and conforming to AGD Group 1 specifications.

Installation Notes

Installation is performed by threading the contact point directly into the dial indicator spindle tip by hand. Avoid using excessive force when threading to prevent damage to the 4-48 threads on either the contact point or the indicator. Verify the contact point is fully seated and secure before use in any measurement application. Follow indicator manufacturer guidelines for contact point replacement and handling.