Spi 21-242-3 Cone Contact Point Dial Indicator

Product Description

The SPI 21-242-3 is a cone-style contact point designed for use with dial indicators in precision measurement applications. Machined from black oxide steel, this contact point threads directly onto compatible dial indicator stems using a 4-48 thread. The cone tip geometry provides consistent, repeatable contact on irregular, curved, or recessed surfaces where a standard flat or ball-style point would not seat reliably. At 1/2 inch in contact point length, it extends the reach of the indicator without sacrificing rigidity. This type of accessory is installed by machinists, quality control technicians, toolmakers, and metrology professionals working in manufacturing and inspection environments.

The 21-242-3 is suited for precision measurement setups where a cone contact profile is required. It conforms to AGD Group 1 industry designation, making it compatible with the broad category of AGD Group 1 dial indicators used in machine shops, inspection departments, and fixture setups. Typical applications include measuring hole depths, recessed features, and angled surfaces that standard contact points cannot reach accurately.

Key Features

• Cone contact geometry for accurate measurement on curved, recessed, or irregular surfaces
• Black oxide steel construction for durability and corrosion resistance in shop environments
• 4-48 thread for direct installation on AGD Group 1 dial indicator stems
• 1/2 inch contact point length provides extended reach without sacrificing stability
• Conforms to AGD Group 1 industry designation

Compatibility

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

Installation Notes

Installation is performed by hand or with a small open-end wrench sized to the indicator stem fitting. Power down or de-energize any automated fixture or CNC setup before changing contact points to prevent unintended movement. Do not overtighten the threaded contact point, as this can damage the 4-48 thread on the indicator stem. Verify indicator zero after replacing any contact point before taking measurements.