Spi 21-995-6 Test Indicator Ball Contact Point

Product Description

The SPI 21-995-6 is a ball-style contact point designed for use with dial test indicators in precision measurement applications. The contact tip is a 0.078 inch diameter stainless steel ball with a contact point length of 0.66 inches, providing accurate surface contact on curved, narrow, or hard-to-reach workpiece features. Manufactured from stainless steel, this contact point offers corrosion resistance and durability under repeated measurement cycles. It is installed by machinists, tool-and-die makers, metrologists, and quality control technicians who require reliable stylus accessories for their indicator setups.

This contact point is intended for use in precision layout, inspection, and quality assurance environments. The ball tip geometry is well suited for measuring curved surfaces, bores, grooves, and recessed features where a flat or standard point cannot maintain consistent contact. The compact dimensions and lightweight construction make it practical for benchtop comparator stands, surface plates, and machine tool setups requiring repeatable indicator readings.

Key Features

• Ball contact tip diameter of 0.078 inches (2.00 mm) for accurate contact on contoured surfaces
• Contact point length of 0.66 inches (16.80 mm) for reach into recessed or narrow features
• Stainless steel construction for corrosion resistance and long service life
• Lightweight at 0.01 pounds, adding negligible mass to the indicator assembly
• Sold individually, compatible with SPI Integral Series test indicators

Compatibility

Designed for use with the SPI Integral Series test indicators.

Installation Notes

Installation is performed by qualified machinists or metrology technicians. Before swapping contact points, remove the indicator from any active measuring setup and secure the indicator body to prevent damage. Contact points are typically threaded and require only hand-tight installation with a small wrench if needed — avoid overtightening, which can damage the indicator spindle threads. Verify tip runout after installation before taking measurements.