Spi 21-118-5 Ball Contact Point Steel Tesa Test Indicators

Product Description

The SPI 21-118-5 is a ball-style contact point designed for use with test indicators in precision measurement applications. The contact tip measures 0.031 inches in diameter and is machined from steel for durability and consistent contact geometry. The overall contact point length is 1.437 inches. This type of accessory is installed by metrology technicians, machinists, and quality control personnel who require accurate surface and feature measurement using dial or digital test indicators.

This contact point is suited for precision measurement tasks in machine shops, manufacturing facilities, and quality assurance environments. It threads onto compatible test indicators to allow measurement of bores, grooves, slots, and other features where a standard straight contact point cannot reach or seat properly. The ball-style tip provides consistent contact with curved and irregular surfaces.

Key Features

• Ball tip diameter of 0.031 inches for precise point contact on small features
• Overall length of 1.437 inches for reach into recessed areas
• Steel construction for wear resistance and dimensional stability
• Designed for use with Tesa test indicators
• Sold individually for targeted replacement or supplemental use

Compatibility

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

Installation Notes

Installation is performed by metrology or machinist personnel and typically requires no special tools beyond hand-tightening the threaded contact point into the indicator spindle. Ensure the indicator is removed from active measurement setup before changing contact points to avoid damage to the spindle or tip. Do not overtighten, as this can damage the threaded connection or alter the indicator's calibration baseline. After installation, verify indicator zero and runout before returning to measurement use.