Spi 20-304-2 Ball Contact Point Steel Mitutoyo Test Indicators

Product Description

The SPI 20-304-2 is a ball-style contact point designed for use with dial test indicators in precision measurement applications. The contact point features a 2.00 mm (0.078 inch) diameter steel ball tip and a total contact point length of 0.606 inches. Constructed from steel, it delivers the rigidity and wear resistance required for consistent, repeatable surface contact. This accessory is installed by machinists, metrology technicians, and quality control professionals who need reliable stylus components for their test indicator setups.

This contact point is suited for precision inspection and gauging tasks in machine shops, manufacturing facilities, and quality labs. It threads onto compatible test indicators to provide accurate deflection readings when checking runout, flatness, bore alignment, and other geometric tolerances. Its compact ball geometry makes it well suited for confined measurement areas and curved or irregular surface profiles where a standard flat contact point cannot maintain consistent contact.

Key Features

• Ball tip diameter of 2.00 mm (0.078 inches) for precise point contact on curved and irregular surfaces
• Contact point length of 0.606 inches for standard reach in most dial test indicator applications
• Steel construction for durability and wear resistance during repeated measurement cycles
• Designed as a direct-fit replacement or spare stylus for Mitutoyo test indicators
• Lightweight at 0.1 pounds, minimizing added mass on the indicator arm

Compatibility

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

Installation Notes

Installation is performed by metrology technicians or machinist-level personnel familiar with dial test indicator maintenance. Before replacing the contact point, remove the indicator from any active measurement setup to avoid accidental deflection or damage to the indicator mechanism. Contact points typically thread into the indicator spindle by hand or with a light wrench — do not overtighten, as this can damage the spindle threads. Verify that the replacement contact point is fully seated and secure before returning the indicator to service.