Spi 20-341-4 Cupped Ball Contact Point 4-48 4mm Dial Indicator

Product Description

The SPI 20-341-4 is a cupped ball contact point designed for use with dial indicators in precision measurement applications. Machined from solid carbide, this contact point threads into standard dial indicator stems using a 4-48 thread and features a cupped ball tip geometry that seats consistently against rounded or spherical workpiece surfaces. The contact point measures 0.5 inches in length and 4 mm in diameter, conforming to AGD Group 1 industry standards. It is a direct drop-in replacement for worn or damaged contact points on compatible dial indicators used in manufacturing, machining, and metrology environments.

This contact point is suited for inspection setups, surface plate work, and machine tool gauging where a cupped ball tip improves repeatability on curved or ball-ended features. It is commonly used in toolrooms, quality labs, and on the shop floor wherever AGD Group 1 dial indicators are in service. Licensed metrologists, machinists, and quality control technicians typically handle contact point replacement as part of routine indicator maintenance.

Key Features

• Solid carbide construction for wear resistance and long service life in high-cycle measurement applications
• Cupped ball tip geometry for consistent seating on convex and spherical workpiece surfaces
• 4-48 thread size compatible with AGD Group 1 dial indicators
• 0.5 inch contact point length for standard reach applications
• 4 mm tip diameter provides stable contact on a range of feature sizes
• Conforms to AGD Group 1 industry designation for standardized fitment

Compatibility

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

Installation Notes

Contact point replacement is performed by qualified machinists or metrologists using appropriate spanner wrenches or contact point tools to avoid damaging the indicator stem. Zero the indicator after replacing the contact point and verify repeatability before returning the instrument to service. Handle solid carbide tips carefully to avoid chipping, and do not overtighten the threaded connection into the indicator stem.