Starrett 72443 Test Indicator Ball Contact Point Steel

Product Description

The STARRETT 72443 is a ball-style contact point designed for use with dial test indicators in precision measurement applications. The contact point features a 2 mm (0.0787 inch) steel ball tip and a total contact point length of 15.88 mm. It threads into compatible dial test indicator stems and provides a spherical contact surface that maintains accurate readings on curved, angled, or irregular workpiece surfaces. Licensed metrology technicians, machinists, and quality control professionals install this type of contact point when standard flat or pointed tips are not suited to the surface geometry being measured. The steel construction provides durability under repeated contact cycles in shop environments.

The 72443 is intended for use with the Starrett 811 and 811M Dial Test Indicators. It is well suited to machine shop and inspection applications where a ball contact tip is required for measuring inside bores, contoured surfaces, or features that a flat contact tip would bridge across rather than seat on. The part ships individually and is sold as a single unit, making it a straightforward replacement when a contact tip is worn, damaged, or lost.

Key Features

• 2 mm ball diameter provides a defined spherical contact surface for curved and angled workpieces
• 15.88 mm contact point length fits standard dial test indicator stem geometry
• Steel construction for wear resistance in production and inspection environments
• Point Identification PT22315 for cross-reference and reorder confirmation
• Compliant with California Proposition 65 disclosure standards

Compatibility

Designed for use with the Starrett 811 and 811M Dial Test Indicators as stated by the manufacturer.

Installation Notes

Contact point replacement on dial test indicators is typically performed by machinists or metrology technicians. Before changing contact points, remove the indicator from its mounting and place it on a clean, stable surface. Thread the contact point in carefully by hand to avoid cross-threading the fine indicator stem threads, then snug lightly — do not overtighten. Verify indicator function and zero repeatability against a known reference surface after any contact point change.