Spi 21-276-1 Drop Indicator Radius Contact Point

Product Description

The SPI 21-276-1 is a radius-style contact point designed for use with dial indicators. It features a 4-48 threaded shank that threads directly into the indicator spindle, replacing or supplementing the standard contact point for applications that require a rounded tip. The contact tip diameter measures 0.183 inches and the contact point length is 0.6 inches. The body is machined from steel for wear resistance under repeated measurement cycles. This accessory is installed by metrology technicians, machinists, and quality control personnel who need a radius tip geometry for part surface contact.

This contact point is suited for use in inspection, gauging, and production measurement environments where a radius tip provides better contact on curved or irregular workpiece surfaces. It conforms to AGD Group 1 standards, making it compatible with standard AGD Group 1 dial indicators. Typical applications include surface runout checks, bore measurements, and fixture-based inspection setups on the shop floor or in a metrology lab.

Key Features

• Radius contact point geometry for consistent contact on curved and contoured surfaces
• 4-48 threaded shank for direct installation into AGD Group 1 dial indicator spindles
• Steel construction for durability and wear resistance during repeated measurement use
• 0.183 inch tip diameter and 0.6 inch contact point length for precise fitment requirements
• AGD Group 1 industry designation ensures broad compatibility with standard dial indicators

Compatibility

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

Installation Notes

Installation is performed by hand or with a contact point wrench — power down or zero out the indicator before swapping contact points to avoid measurement errors. Thread the 4-48 shank carefully to avoid cross-threading the indicator spindle. Follow the indicator manufacturer's guidance on contact point torque to avoid spindle damage.