Spi 20-655-7 Test Indicator Ball Contact Point Steel

Product Description

The SPI 20-655-7 is a ball-style contact point designed for use with dial-type test indicators in precision measurement applications. The contact tip is a 0.078-inch diameter steel ball mounted on a shaft with an overall contact point length of 0.671 inches. This replacement contact point threads into compatible test indicator spindles, restoring measurement accuracy without replacing the full instrument. It is installed by metrology technicians, quality control personnel, and machinists who require reliable surface contact geometry for runout, flatness, and bore measurement work.

This contact point is suited for inspection and layout tasks on machine tools, surface plates, and fixtures where a ball-tip stylus provides consistent contact on curved, angled, or irregular surfaces. The steel construction offers durability for repetitive contact in shop-floor environments. It is a direct-fit replacement accessory for Teclock test indicators requiring a standard ball-style tip.

Key Features

• 0.078-inch (2.00 mm) diameter steel ball tip for accurate point contact on varied surfaces
• 0.671-inch overall contact point length for standard indicator fitment
• Steel construction for durability in repeated-contact measurement cycles
• Drop-in replacement restores indicator function without full instrument replacement
• Compact and lightweight at 0.1 pounds for easy handling and storage

Compatibility

Designed for use with Teclock test indicators requiring a ball-style contact point.

Installation Notes

Contact point replacement is performed by metrology or QC technicians. Remove the existing contact point by unscrewing it from the indicator spindle before threading in the replacement — do not force or cross-thread the tip. Handle the ball tip carefully to avoid surface damage that could affect measurement accuracy. Verify indicator calibration after installing a new contact point.