Spi 21-275-3 Ball Point Contact Points 14 Pc Agd

Product Description

The SPI 21-275-3 is a 14-piece ball point contact point set designed for use with AGD (American Gage Design) dial indicators. The set includes a variety of interchangeable contact point styles — ball, radius, conical, flat face, and needle — giving metrology technicians and tool room staff the flexibility to measure across curved, recessed, or irregular surfaces without swapping between separate kits. The steel ball construction ensures consistent contact and wear resistance under repeated measuring cycles. At 2 pounds, the full set ships in a compact case sized at 6 inches long, 5 inches wide, and 1 inch in height.

This set is suited for tool rooms, quality control departments, and precision machining environments where AGD-style dial indicators are the standard measuring instrument. The variety of point styles allows a single technician to move from bore measurement to surface inspection to thread checking without sourcing additional accessories. Typical users include machinists, QC inspectors, and metrology technicians working in manufacturing, aerospace, or general industrial shops.

Key Features

• 14 interchangeable contact points covering ball, radius, flat face, conical tip, and needle point styles
• Steel ball material for durability and repeatable contact geometry
• Compatible with AGD dial indicators — the industry-standard gage body format
• Includes a shock-absorbing point for use on surfaces where indicator protection is a concern
• Compact storage case: 6 inches long, 5 inches wide, 1 inch tall
• Ships as a single unit package with no minimum order requirement beyond one set

Compatibility

Designed for use with AGD (American Gage Design) dial indicators as stated by the manufacturer.

Installation Notes

Contact point sets are installed by qualified metrology or tool room personnel. Before swapping contact points, ensure the dial indicator is removed from active use and secured in a holding fixture or stand to prevent damage. Use the appropriate spanner or contact point wrench to thread points to the correct snug fit — avoid overtightening, which can damage the indicator stem threads. Follow any applicable shop calibration procedures after changing contact point style to verify zero and travel accuracy.