Spi 20-973-4 Ball Needle Contact Point 4-48 Dial Indicators

Product Description

The SPI 20-973-4 is a ball needle contact point designed for use with dial indicators in precision measurement applications. It features a 1/16-inch diameter chrome alloy steel ball tip mounted on a 0.75-inch contact point body with a 4-48 thread for secure attachment. This contact point conforms to AGD Group 1 industry standards, making it a straightforward replacement or supplemental tip for trade professionals and metrology technicians who rely on dial indicators for surface inspection, runout checks, and dimensional verification work.

This contact point is suited for use in machine shops, HVAC and plumbing fabrication environments, and any precision trade setting where dial indicator measurements are part of standard workflow. It is compatible with AGD Group 1 dial indicators that accept a 4-48 threaded contact point. The ball needle style is commonly selected for contact measurement on curved or irregular surfaces where a flat tip would not seat consistently.

Key Features

• Ball needle tip style for accurate contact on curved and irregular measurement surfaces
• Chrome alloy steel construction for durability and wear resistance
• 0.75-inch contact point length for standard reach applications
• 1/16-inch ball diameter provides a consistent, repeatable contact area
• 4-48 thread size for compatibility with AGD Group 1 dial indicators
• Meets AGD Group 1 industry designation for standardized fitment

Compatibility

Designed for use with AGD Group 1 dial indicators accepting a 4-48 threaded contact point. Confirm thread size and contact point length requirements before installation.

Installation Notes

Installation is typically performed by a machinist, calibration technician, or trade professional maintaining precision measurement tools. Power down or de-energize any equipment under inspection before changing contact points. Thread the contact point in by hand first to avoid cross-threading, then snug with the appropriate small wrench. Do not overtighten, as this can damage the indicator spindle threads.