Spi 21-254-8 Flat Button Contact Point Dial Indicator

Product Description

The SPI 21-254-8 is a flat button contact point designed for use with dial indicators in precision measurement applications. Threaded at 4-48 and machined from black oxide steel, this replacement contact point provides a stable, low-profile interface between the indicator spindle and the workpiece surface. The flat button style distributes contact force evenly, making it well suited for measurements on flat or slightly irregular surfaces. At 0.094 inches in contact point length and 3/8 inch in diameter, this part fits standard AGD Group 1 dial indicator spindle threads and installs without tools in seconds.

This contact point is used in machine shops, manufacturing facilities, and field calibration environments wherever dial indicators are part of inspection or setup routines. It is a direct replacement for worn or damaged contact points on AGD Group 1 dial indicators. Machinists, metrology technicians, and quality control personnel typically stock these as consumable accessories. The black oxide finish provides corrosion resistance in light industrial environments.

Key Features

• Flat button contact style for stable, even contact on flat surfaces
• Black oxide steel construction for corrosion resistance and durability
• 4-48 thread size compatible with AGD Group 1 dial indicator spindles
• 0.094 inch contact point length for standard-depth spindle engagement
• 3/8 inch diameter button face for broad surface contact

Compatibility

Designed for use with dial indicators requiring a 4-48 threaded contact point, conforming to AGD Group 1 industry designation standards.

Installation Notes

Installation is performed by machinists or metrology technicians as part of routine dial indicator maintenance or setup. Remove the existing contact point by unscrewing it from the indicator spindle before threading on the replacement. Avoid over-tightening, as the 4-48 thread is fine and can be damaged by excessive torque. Verify indicator zero and calibration after any contact point change.