Starrett 72444 Ball Contact Point 2mm Steel Dial Test Indicator

Product Description

The STARRETT 72444 is a ball-style contact point designed for use with dial test indicators in precision measurement applications. The contact tip features a 2 mm (0.0787 inch) ball diameter and a 33.34 mm overall contact point length, providing reliable stylus contact on curved, irregular, or hard-to-reach surfaces. Constructed from steel for durability and wear resistance, this contact point threads directly onto compatible Starrett dial test indicator spindles. It is installed by machinists, toolroom technicians, and quality-control inspectors who require repeatable, accurate surface contact during runout, flatness, and alignment checks.

This contact point is suited for inspection and measurement tasks on machine tools, fixtures, and precision components. It performs well in applications where a standard flat or pointed contact would not maintain consistent contact geometry, such as on bores, radii, or contoured surfaces. The ball tip style distributes contact load evenly, reducing surface marking on finished workpieces. Its compact form factor and standard thread compatibility make it a straightforward field or bench replacement for worn or damaged contact points.

Key Features

• Ball-style tip with 2 mm (0.0787 inch) diameter for consistent contact on curved surfaces
• 33.34 mm overall contact point length for reach in confined measurement locations
• Steel construction for long service life under repeated use
• Designed as a direct-fit replacement for Starrett 811 and 811M dial test indicators
• Point Identification PT23011 for cross-reference and reorder purposes
• Complies with California Proposition 65 standards

Compatibility

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

Installation Notes

Contact point replacement is typically performed by machinists or metrology technicians using standard hand tools. Before replacing the contact point, ensure the indicator is removed from any active measurement setup to prevent damage to the spindle or gauge face. Thread the contact point carefully by hand first to avoid cross-threading, then snug with the appropriate wrench if required. Verify zero calibration after replacing the contact point before returning the indicator to service.