Spi 21-121-9 Ball Contact Point Carbide Tesa Test Indicators

Product Description

The SPI 21-121-9 is a carbide ball contact point designed for use with Tesa test indicators. It features a 0.015 inch ball diameter and a contact point length of 0.497 inches, making it suited for high-precision measurement tasks where minimal deflection and consistent contact geometry are critical. The carbide tip material provides superior wear resistance compared to standard steel tips, extending service life in repetitive gauging applications. Metrology technicians, toolroom machinists, and quality control inspectors use this contact point when checking bore geometry, runout, surface variation, and tight-tolerance features on machined parts.

This contact point is intended for use with Tesa brand test indicators in inspection and measurement environments. Typical applications include checking concentricity, flatness, and positional variation on precision components in manufacturing and quality assurance settings. The small 0.015 inch ball diameter allows access to fine features and narrow grooves where larger contact points cannot maintain consistent contact. It is well suited to both shop-floor and lab-grade metrology setups.

Key Features

• Carbide ball tip for extended wear resistance in high-cycle gauging applications
• 0.015 inch ball diameter enables contact in fine features and tight geometries
• 0.497 inch contact point length provides reach for recessed measurement surfaces
• Designed specifically for compatibility with Tesa test indicators
• Lightweight construction at 0.1 pounds minimizes indicator loading

Compatibility

Designed for use with Tesa test indicators, as specified by the manufacturer.

Installation Notes

Contact point replacement is performed by metrology technicians or toolroom personnel using the appropriate thread fitting for the indicator model. Power-down or lockout procedures are not applicable to mechanical test indicators. Handle carbide-tipped contact points with care to avoid chipping the tip against hard surfaces during installation or storage. Verify thread engagement is secure and the contact point is properly seated before use to ensure accurate readings.