Spi 21-049-2 Ball Contact Point Steel Interapid Test Indicators

Product Description

The SPI 21-049-2 is a ball-style contact point designed for use with dial test indicators in precision measurement applications. The contact tip features a 0.078 inch ball diameter machined from steel, providing consistent, repeatable surface contact when taking runout, bore, or surface variation readings. The overall contact point length is 0.688 inches. This replacement contact point is installed by machinists, quality control technicians, and tool room personnel who work with test indicators on manual or CNC setups.

This contact point is intended for use with Interapid test indicators. It is a standard replacement component for shops performing precision inspection work on machined parts, fixtures, and tooling. Typical applications include surface plate inspection, machine tool setup, and in-process quality checks where accurate deflection measurement is required.

Key Features

• 0.078 inch (2.00 mm) ball diameter for precise surface contact
• 0.688 inch contact point length suits standard indicator reach requirements
• Steel construction provides durability under repeated measurement contact
• Direct replacement for worn or damaged Interapid test indicator contact points
• Compact and lightweight at 0.1 pounds for minimal indicator arm loading

Compatibility

Designed for use with Interapid test indicators as stated by the manufacturer.

Installation Notes

Contact point replacement on dial test indicators is performed by quality technicians or machinists using standard indicator wrenches or small open-end wrenches. Ensure the indicator is removed from any active measuring setup before swapping contact points. Thread the contact point in carefully to avoid cross-threading the indicator spindle. Verify seating and zero the indicator before returning it to service.