Spi 21-260-5 Flat Button Contact Point Dial Indicator

Product Description

The SPI 21-260-5 is a flat button contact point replacement designed for use with dial indicators. Threaded to a 4-48 specification, it installs directly onto the spindle of AGD Group 1 dial indicators to provide a broad, flat measurement surface. The contact point is machined from black oxide steel for durability and corrosion resistance. With a contact point length of 0.25 inches and a button face diameter of 2 inches, it suits applications where a wide contact area is needed to measure flat or slightly irregular surfaces accurately. Metrology technicians, tool room machinists, and quality control inspectors typically use this type of accessory during setup, inspection, and gauging operations.

This contact point is suited for dimensional inspection work in tool rooms, machine shops, and quality control environments. It is designed for dial indicators conforming to the AGD Group 1 standard, making it a common replacement or alternate-geometry contact for indicators used on surface plates, magnetic bases, and fixture-mounted setups. The flat button geometry is preferred when measuring soft materials, broad surfaces, or situations where a standard spherical contact point may embed into or mark the workpiece.

Key Features

• Flat button contact style provides broad surface contact for accurate measurement on flat workpieces
• Black oxide steel construction resists corrosion and wear during regular shop use
• 4-48 thread size fits AGD Group 1 dial indicator spindles
• 0.25 inch contact point length for standard depth engagement
• 2 inch button face diameter for wide-area contact measurement
• Lightweight at 0.1 pounds, adding minimal mass to indicator spindle

Compatibility

Designed for use with AGD Group 1 dial indicators accepting a 4-48 threaded contact point.

Installation Notes

Installation is performed by threading the contact point onto the dial indicator spindle by hand or with a suitable small wrench, taking care not to overtighten and damage the spindle threads. Before replacing a contact point, zero the indicator and verify spindle travel is unobstructed. Ensure the indicator is removed from any active measuring fixture or magnetic base before servicing the contact point. Follow shop calibration procedures after any contact point change to confirm measurement accuracy.