Starrett 70793 Ball Contact Point Agd Dial Indicators

Product Description

The STARRETT 70793 is a steel ball contact point designed for use with AGD dial indicators. It threads in on a 4-48 thread and seats a 3/8-inch diameter ball at the tip. The contact point length measures 3/32 inches, with an overall length of 1/4 inch. This type of contact point is used when a spherical tip is needed to accurately transfer displacement readings on curved, irregular, or precision-machined surfaces. Installation is straightforward and requires only a compatible AGD-style indicator body. Metrology technicians, machinists, and quality control personnel are the primary users of this component.

This contact point fits standard AGD dial indicators that accept 4-48 threaded contact points. It is well suited for inspection setups on machine tools, surface plates, and fixture gauging applications in both shop-floor and lab environments. The steel ball construction handles repeated contact cycles on metal workpieces without significant deformation, maintaining measurement integrity across a production run or inspection series.

Key Features

• 4-48 thread size for compatibility with AGD dial indicator spindles
• 3/8-inch diameter steel ball tip for contact on curved or irregular surfaces
• 3/32-inch contact point length keeps the ball close to the spindle for stable readings
• 1/4-inch overall length for compact installation in tight gauging setups
• Steel construction for durability through repeated measurement cycles

Compatibility

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

Installation Notes

Installation is performed by threading the contact point into the spindle of the dial indicator by hand, then snugging it with the appropriate wrench if needed — do not overtighten, as the small 4-48 thread is fine-pitched and easily damaged. Remove the indicator from any active gauging fixture before swapping contact points. Verify that the replacement contact point is fully seated and the indicator reads zero correctly against a known reference before returning the instrument to service.