Spi 20-982-5 Ball Contact Point Dial Indicator

Product Description

The SPI 20-982-5 is a ball-style contact point designed for use with dial indicators in precision measurement applications. Machined from chrome alloy steel, this contact point features a 5/16-inch ball diameter and a 0.75-inch contact point length with a 4-48 thread size for secure attachment. It meets AGD Group 1 industry designation, making it a standard-compliant replacement or spare for dial indicator setups. Machinists, tool and die technicians, and quality control personnel install this type of contact point when the application requires ball-tip contact geometry for accurate surface measurement.

This contact point is suited for dimensional inspection and machine tool measurement environments where dial indicators are regularly used. The ball contact geometry distributes contact force evenly, which is useful when measuring curved or irregular surfaces. The 4-48 thread is the standard thread size for AGD Group 1 dial indicators, making this a direct-fit replacement in most compatible setups. It is typically used on the shop floor, in inspection rooms, and on machining centers requiring repeatable and accurate linear measurement.

Key Features

• Ball contact style for accurate measurement on curved and flat surfaces
• Chrome alloy steel construction for durability and wear resistance
• 0.75-inch (3/4 inch) contact point length
• 5/16-inch ball diameter for consistent contact geometry
• 4-48 thread size conforming to AGD Group 1 industry designation
• Compatible with standard dial indicators

Compatibility

Designed for use with dial indicators meeting AGD Group 1 standards. The 4-48 thread size is the industry-standard thread for this group of dial indicators.

Installation Notes

Installation is performed by machinists or metrology technicians using standard hand tools. Ensure the dial indicator is removed from active measurement setups before changing contact points. Thread the contact point in by hand first to avoid cross-threading, then snug with appropriate tooling without overtightening. Verify indicator zeroing and calibration after replacing any contact point.