Spi 21-065-8 Ball Contact Point Carbide 0.078 in

Product Description

The SPI 21-065-8 is a carbide ball contact point designed for use with precision dial test indicators. It provides a hardened, wear-resistant contact surface for accurate and repeatable surface measurement. The ball tip measures 0.078 inches in diameter, and the overall contact point length is 1.75 inches. Carbide construction ensures long service life in demanding shop environments where frequent contact with metal surfaces would rapidly wear a softer tip. This contact point is installed by metrology technicians, machinists, and quality control personnel working with dial indicator setups on surface plates, machine tools, or inspection fixtures.

This contact point is intended for precision measurement applications in machine shops, tool rooms, and quality inspection environments. It is suited for runout checks, surface deviation measurement, and bore alignment tasks where a small-diameter ball tip is needed to reach tight features or follow fine surface contours. The 0.078-inch ball diameter allows contact in areas where a larger tip would make inaccurate readings due to geometry interference.

Key Features

• Carbide ball tip for extended wear resistance in high-use measurement environments
• 0.078 inch ball diameter for access to tight features and fine surface contours
• 1.75 inch contact point length provides reach for recessed measurement locations
• Designed for use with Interapid test indicators
• Compact and lightweight at 0.1 pounds for easy handling and replacement

Compatibility

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

Installation Notes

Contact point replacement is performed by metrology technicians or machinists and requires no special tools beyond those used to thread or seat the contact into the indicator stem. Always handle carbide tips carefully to avoid chipping the ball surface against hard objects during installation. Verify the contact point is fully seated and secure before taking measurements to prevent false readings or damage to the indicator.