Starrett 72455 Ball Contact Point Carbide Dial Test Indicator

Product Description

The STARRETT 72455 is a carbide ball contact point designed for use with dial test indicators in precision measurement applications. The contact point features a 0.0315-inch (0.80 mm) ball diameter and a total contact point length of 33.34 mm, providing accurate surface contact for fine measurement work. The carbide tip material offers exceptional hardness and wear resistance, making it suitable for repeated use in high-cycle inspection environments. This type of contact point is typically installed and replaced by machinists, metrology technicians, and quality control professionals working with indicator-based gauging setups on machine tools, surface plates, and inspection fixtures.

The STARRETT 72455 is intended for use with the Starrett 811 and 811M series dial test indicators. These indicators are commonly found in machine shops, toolrooms, and quality labs where precise surface runout, alignment, and dimensional verification are required. The ball-style contact point is well suited for measuring curved or irregular surfaces where a flat or pointed tip would not seat correctly, and for applications requiring consistent contact geometry across repeated measurements.

Key Features

• Carbide ball tip provides high wear resistance for extended service life in production measurement environments
• Ball diameter of 0.0315 inches (0.80 mm) for fine-contact surface measurement
• Contact point length of 33.34 mm supports standard reach requirements for the 811 and 811M indicator series
• Point Identification PT23064X for cross-referencing and replacement ordering
• Sold as a single contact point, compatible with direct field replacement without special tooling

Compatibility

Designed for use with the Starrett 811 and 811M dial test indicators as specified by the manufacturer.

Installation Notes

Contact point replacement on dial test indicators should be performed by a qualified machinist or metrology technician familiar with the specific indicator model. Ensure the indicator is removed from any active gauging setup and secured before replacing the contact point. Use the appropriate wrench or tool recommended for the indicator thread to avoid damaging the indicator spindle or the new contact point. Avoid overtightening, as this can affect indicator accuracy and damage the threaded spindle.