Spi 20-658-1 Ball Contact Point Steel Teclock Test Indicators

Product Description

The SPI 20-658-1 is a ball-style contact point designed for use with dial test indicators in precision measurement applications. Machined from steel, this contact point features a 0.078-inch ball diameter and a contact point length of 1.47 inches. It threads into compatible test indicator spindles and transfers surface contact to the indicator mechanism, enabling accurate runout, deflection, and surface variation readings. Metrology technicians, machinists, and quality control inspectors install this type of contact point when the standard stylus tip is not suited to the measurement geometry or surface condition.

This contact point is suited for use in machine shops, toolrooms, and quality inspection environments where dial test indicators are used for part setup, fixture verification, and in-process measurement. The ball-style tip is commonly selected when measuring in bores, on contoured surfaces, or in applications where a spherical contact geometry reduces cosine error. The 0.078-inch ball diameter allows access to features where a larger tip would not seat correctly.

Key Features

• Ball-style contact geometry reduces cosine error on angled and curved surfaces
• 0.078-inch (2.00 mm) ball diameter for access to small or contoured features
• 1.47-inch contact point length extends reach for recessed measurement locations
• Steel construction provides durability and resistance to wear under repeated contact cycles
• Designed as a direct-fit replacement or spare for Teclock test indicator configurations

Compatibility

Designed for use with Teclock test indicators. Confirm thread specification and stem diameter against your indicator model before installation.

Installation Notes

Contact point installation and replacement is performed by machinists and metrology technicians and does not require special certifications. Power down or disable any automated equipment before servicing an indicator mounted in a machine or fixture. Thread the contact point in by hand first to avoid cross-threading, then snug with the appropriate small wrench — do not overtighten, as this can damage the indicator spindle threads. Store contact points in a protective case when not in use to prevent tip damage.