Spi 20-974-2 Ball Needle Contact Point 4-48 Thread

Product Description

The SPI 20-974-2 is a ball needle contact point designed for use with dial indicators in precision measurement applications. The contact point features a chrome alloy steel construction and measures 0.75 inches in length with a ball diameter of 0.0781 inches. It threads in at a 4-48 thread size, conforming to AGD Group 1 industry standards. This contact point is installed by machinists, metrology technicians, and quality control professionals who require consistent, repeatable contact geometry when taking readings with dial indicators in inspection and manufacturing environments.

This contact point is suited for use on dial indicators in both shop-floor and inspection room settings. The ball needle style tip is commonly used when measuring bores, grooves, or surfaces where a fine-point contact is required for accurate readings. The AGD Group 1 designation ensures fitment compatibility across a wide range of standard dial indicator bodies used in production and quality assurance workflows.

Key Features

• Ball needle contact point style for precise, repeatable measurement contact
• Chrome alloy steel construction for durability and wear resistance
• 0.75 inch contact point length for standard reach applications
• 0.0781 inch ball diameter for fine-point surface contact
• 4-48 thread size conforming to AGD Group 1 industry designation
• Compatible with dial indicators requiring AGD Group 1 contact points

Compatibility

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

Installation Notes

Installation is performed by threading the contact point into the dial indicator spindle by hand until snug. Avoid overtightening, as this can damage the 4-48 thread on the indicator spindle. Ensure the indicator is zeroed and calibrated after replacing the contact point before taking measurements.