Spi 21-986-5 Test Indicator Ball Contact Point Carbide

Product Description

The SPI 21-986-5 is a carbide ball contact point designed for use with dial test indicators in precision measurement applications. The spherical tip measures 0.078 inches in diameter and the overall contact point length is 0.74 inches, providing a compact profile suited for accessing tight bores, grooves, and internal surfaces. Carbide construction delivers the wear resistance needed for repeated contact cycles in shop and inspection environments. Machinists, quality control technicians, and toolroom professionals install this type of contact point when switching tip styles on a test indicator to match the measurement task at hand.

This contact point is intended for use with the SPI Integral Series of dial test indicators. It is well suited to precision measurement tasks in machine shops, metrology labs, and manufacturing facilities where consistent tip geometry is critical to repeatable readings. The ball-style tip is commonly chosen for measuring curved surfaces, runout checks, and bore alignment where a pointed tip would not provide stable contact.

Key Features

• Carbide ball tip for extended wear life under repeated contact cycles
• Ball diameter of 0.078 inches (2.00 mm) for stable contact on curved and internal surfaces
• Contact point length of 0.74 inches (20.80 mm) for reach into confined measurement areas
• Tip diameter of 0.078 inches matches ball diameter for consistent contact geometry
• Sold individually, minimum order quantity of 1

Compatibility

Designed for use with the SPI Integral Series dial test indicators.

Installation Notes

Contact point replacement is typically performed by a machinist or metrology technician. Before swapping contact points, ensure the indicator is removed from any active measurement setup to avoid damage to the spindle or tip threads. Use the appropriate wrench or holding tool as specified for the indicator model to avoid overtightening, which can damage the threaded stem. Handle carbide tips carefully to prevent chipping from impact with hard surfaces.