Spi 21-127-6 Ball Contact Point Carbide 0.118 Inch

Product Description

The SPI 21-127-6 is a carbide ball contact point designed for use with dial test indicators in precision measurement applications. The ball tip measures 0.118 inches in diameter and the contact point length is 0.497 inches, providing the short, accurate reach required for surface deviation and runout measurements. The carbide construction delivers hardness and wear resistance suited to repeated contact against metal workpieces. This contact point is a small but critical component in any metrology or quality-control setup on the shop floor or in a calibration environment. Machinists, quality technicians, and tool room professionals are the primary installers and users.

This contact point is intended for use with Brown and Sharpe test indicators in inspection, setup, and alignment tasks. Typical applications include checking runout on a lathe, verifying flatness on a surface plate, and aligning a vise or fixture on a machining center. The compact 0.118-inch carbide ball allows access to tight bores and small features where a larger tip would be obstructed. It ships as a single unit, suitable for replacement of a worn or damaged tip on an existing indicator.

Key Features

• Carbide ball tip for long service life under repeated metal contact
• 0.118 inch ball diameter enables access to tight-tolerance features
• 0.497 inch contact point length suits standard test indicator stems
• Single-piece replacement unit minimizes indicator downtime
• Designed specifically for Brown and Sharpe test indicator compatibility

Compatibility

Designed for use with Brown and Sharpe test indicators as specified by the manufacturer.

Installation Notes

Installation is performed by quality technicians or machinists. Before swapping the contact point, remove the indicator from any active setup and ensure the indicator spindle is at rest. Use the appropriate wrench or contact point tool to avoid side-loading the indicator stem during removal and installation. Overtightening the contact point can damage the indicator thread; snug to finger-tight plus a small turn with the correct tool is the standard practice.