Spi 21-058-3 Carbide Ball Contact Point Interapid

Product Description

The SPI 21-058-3 is a carbide ball contact point designed for use with Interapid test indicators. It features a 0.031 inch ball diameter and a contact point length of 0.812 inches, making it suited for precise measurement tasks in tight or recessed areas. The carbide construction provides durability and wear resistance, maintaining measurement accuracy over extended use. This contact point is a replacement or spare accessory installed by machinists, quality control technicians, and tool room personnel who rely on Interapid indicators for surface, bore, or feature inspection work.

This contact point fits Interapid test indicators and is used in precision measurement applications in machine shops, manufacturing facilities, and inspection environments. It is suited for checking runout, flatness, and feature alignment where a small ball tip is required to reach confined geometry. The compact dimensions allow access to tight areas that standard contact points cannot reach.

Key Features

• Carbide ball tip resists wear during repeated measurement cycles
• 0.031 inch ball diameter for access to small features and confined geometry
• 0.812 inch contact point length suited for standard Interapid indicator mounting
• Replacement-ready design for fast field or shop changeover
• Sold individually for single-point replacement without purchasing a full set

Compatibility

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

Installation Notes

Contact point replacement on test indicators is typically performed by machinists or metrology technicians using a small wrench or contact point tool. Remove the indicator from service before swapping contact points to avoid damage to the spindle or stylus thread. Thread the contact point in by hand first, then snug with the appropriate tool — do not overtighten, as the threaded stylus shank is small and can be damaged. Verify the indicator reads zero correctly with a reference surface after installation.