Starrett 66239 Ball Contact Point Carbide for 709 Indicator

Product Description

The STARRETT 66239 is a carbide ball contact point designed as a replacement tip for precision test indicators. It features a 0.078 inch ball diameter and a contact point length of 1-23/64 inches, providing consistent, repeatable stylus contact during surface measurement and runout inspection. The carbide tip construction delivers excellent wear resistance in high-cycle measurement applications. This contact point is installed by machinists, metrologists, and tool-and-die technicians who require accurate indicator readings on CNC setups, surface plates, and inspection fixtures.

This contact point is intended for use with the Starrett 709 Test Indicator. It suits typical shop floor and inspection room applications where a ball-style contact point is needed to measure curved or irregular surfaces. The ball tip geometry allows consistent contact angle regardless of stylus approach direction, making it well-suited for bore runout, shaft alignment, and precision layout work in both production and quality-control environments.

Key Features

• Carbide tip construction for extended wear life in high-cycle measurement use
• 0.078 inch (2.00 mm) ball diameter for precise surface contact
• 1-23/64 inch contact point length to reach standard indicator mounting depth
• Ball-style geometry maintains consistent contact on curved and irregular surfaces
• OEM-style replacement designed specifically for the Starrett 709 Test Indicator

Compatibility

Designed for use with the Starrett 709 Test Indicator as stated by the manufacturer.

Installation Notes

Installation is performed by the end user or metrology technician without special tools in most cases. Zero the indicator before taking measurements after replacing the contact point to confirm proper seating and accurate stylus deflection. Inspect the threaded shank for proper engagement and ensure the tip is fully seated before use. Do not overtighten the contact point, as this may damage the indicator stem threads.