Spi 20-972-6 Ball Needle Contact Point 4-48 Thread

Product Description

The SPI 20-972-6 is a ball needle contact point designed for use with dial indicators in precision measurement applications. Machined from chrome alloy steel, this contact point features a 0.75-inch length and a 0.0469-inch ball diameter, providing a fine, repeatable contact surface for accurate readings. It threads in at the standard 4-48 thread size and conforms to the AGD Group 1 industry designation, making it a direct fit for the broad range of dial indicators built to that specification. Machinists, tool-and-die workers, and metrology technicians install this type of contact point when a ball-tipped probe is required for part geometry, runout, or surface deviation measurements.

This contact point is suited for precision measurement work in machine shops, manufacturing environments, and quality control settings. It is intended for use with AGD Group 1 dial indicators where the standard 4-48 thread interface is specified. The ball needle style is commonly selected when measuring in grooves, bores, or contoured surfaces where a flat or standard point would not seat reliably. Package quantity is one piece.

Key Features

• Chrome alloy steel construction for durability and wear resistance
• 0.75-inch contact point length for reach into recessed measurement areas
• 0.0469-inch ball diameter provides a fine, consistent contact surface
• 4-48 thread size matches the AGD Group 1 standard dial indicator interface
• Conforms to AGD Group 1 industry designation for broad indicator compatibility

Compatibility

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

Installation Notes

Contact point replacement is typically performed by machinists or metrologists using the wrench flat or knurled body of the indicator stem. Thread the contact point in by hand first to avoid cross-threading the 4-48 threads, then snug with the appropriate small wrench. Do not overtighten, as the fine thread can be damaged. Verify that the indicator reads zero correctly with a reference surface after swapping contact points.