Spi 20-986-6 Ball Contact Point Dial Indicator

Product Description

The SPI 20-986-6 is a ball-style contact point designed for use with dial indicators in precision measurement applications. Machined from chrome alloy steel, this contact point threads onto the indicator spindle via a 4-48 thread and extends 0.75 inches in length. The 7/16-inch ball tip provides a consistent, repeatable contact surface for accurate readings on flat, curved, or irregular workpiece surfaces. It conforms to the AGD Group 1 industry designation, ensuring compatibility with standard dial indicator configurations used throughout machining, inspection, and metrology workflows. Machinists, quality control technicians, and tool-and-die professionals rely on this type of contact point for everyday gauging tasks.

This contact point is suited for use on the shop floor, in inspection rooms, and in field measurement settings. It is a direct replacement or supplemental contact point for AGD Group 1 dial indicators where a ball-tip geometry is required. Ball contact points are commonly selected when measuring curved surfaces, bores, or any feature where a flat or pointed tip would produce inconsistent contact. The 4-48 threaded base is the standard thread for AGD Group 1 dial indicator spindles.

Key Features

• Ball-style contact geometry for consistent contact on curved or irregular surfaces
• Chrome alloy steel construction for wear resistance and durability
• 0.75-inch contact point length with 7/16-inch ball diameter
• 4-48 thread size matches AGD Group 1 dial indicator spindles
• Meets AGD Group 1 industry designation for standardized fitment

Compatibility

Designed for use with AGD Group 1 dial indicators that accept a standard 4-48 threaded contact point.

Installation Notes

Installation is performed by hand-threading the contact point onto the dial indicator spindle. Power down or remove any automated measurement system before swapping contact points to avoid damage to the indicator mechanism. Do not overtighten, as the 4-48 thread is fine and can strip under excessive torque. Verify indicator zero after replacing the contact point to confirm proper seating and accurate readings.