Starrett 72456 Test Indicator Ball Contact Point Carbide

Product Description

The STARRETT 72456 is a carbide ball contact point designed for use with dial test indicators. It features a 2 mm ball diameter and a contact point length of 33.34 mm, making it suited for precise surface measurement and runout inspection tasks. The carbide tip provides excellent wear resistance under repeated contact cycles, maintaining accuracy over extended use. This type of contact point is a consumable accessory installed by machinists, tool-and-die makers, metrology technicians, and precision measurement professionals working in manufacturing, inspection, and quality control environments.

This contact point is designed for use with Starrett 811 and 811M Dial Test Indicators. It is commonly used in inspection setups on machine tools, surface plates, and fixtures where a ball-style contact point is required for probing curved surfaces, bores, or recessed features. The ball geometry allows consistent contact on irregular or contoured workpieces where a flat or pointed tip would produce inconsistent readings.

Key Features

• Carbide tip construction for long service life and resistance to wear
• 2 mm ball diameter for contact on curved and contoured surfaces
• 33.34 mm contact point length for reach into recessed measurement areas
• Ball-style geometry provides consistent contact on bores and irregular profiles
• Designed as a direct-fit accessory for Starrett 811 and 811M indicators
• Point Identification: PT23011X

Compatibility

Designed for use with Starrett 811 and 811M Dial Test Indicators.

Installation Notes

Contact point replacement is performed by metrology technicians and machinists. Before changing the contact point, remove the indicator from any active measurement fixture to avoid accidental damage to the indicator mechanism. Contact points are typically threaded and require careful hand-tightening to avoid cross-threading the indicator stem. Do not apply excessive torque or use power tools when installing the contact point.