Spi 21-258-9 Flat Button Contact Point Dial Indicator

Product Description

The SPI 21-258-9 is a flat button contact point designed for use with dial indicators in precision measurement applications. Manufactured from black oxide steel, this contact point features a 4-48 thread for secure attachment and a 1/8-inch contact length with a 1-inch diameter face. The flat button profile distributes contact force evenly across a surface, making it well suited for gauging flat, smooth workpieces. It conforms to AGD Group 1 industry standards, ensuring compatibility with a wide range of standard dial indicator stems. Machinists, quality control technicians, and tool room personnel are the primary users of this accessory.

This contact point is a drop-in accessory for dial indicators used in machine shop, inspection room, and manufacturing floor environments. It is appropriate for checking flatness, runout, and surface variation on machined parts. The flat button style is preferred when measuring soft materials or finished surfaces where a pointed or ball contact could mar the workpiece. Compatible with AGD Group 1 dial indicators that accept a 4-48 threaded contact point.

Key Features

• Flat button contact style distributes load evenly for accurate surface measurement
• Black oxide steel construction for durability and corrosion resistance
• 4-48 thread size for standard AGD Group 1 dial indicator compatibility
• 1-inch contact face diameter suits wide-area surface gauging
• 1/8-inch contact point length for low-profile installation
• Meets AGD Group 1 industry designation

Compatibility

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

Installation Notes

Installation is performed by threading the contact point onto the dial indicator stem by hand until snug. Avoid overtightening, as the fine 4-48 thread can be damaged by excessive torque. Power down or de-energize any automated gauging fixture before servicing the indicator or swapping contact points. No special tools are required beyond a suitable wrench or spanner if the stem fitting is recessed.