Spi 12-741-5 Chrome Steel Gage Ball 0.6875 in Grade 25

Product Description

The SPI 12-741-5 is a hardened chrome steel gage ball used for precision measurement and inspection applications. With a diameter of 0.6875 inches and a tolerance of 0.0001 inches, this ball meets Grade 25 accuracy standards and carries AFBMA certification. The Rockwell hardness rating of 63 RC reflects a fully hardened heat treatment, making it suitable for use in gauging fixtures, GO/NO-GO gauges, and dimensional inspection setups. Metrology technicians, quality control personnel, and tool-and-die shops rely on parts at this tolerance class for traceable, repeatable measurement results.

This gage ball is appropriate for use in inspection rooms, on the shop floor, and in fixture-based gauging systems where tight dimensional control is required. It is well-suited for applications in manufacturing quality assurance, tooling setups, and any inspection process that demands certified Grade 25 spherical accuracy. The AFBMA certification ensures the ball conforms to recognized dimensional and tolerance standards for precision balls.

Key Features

• 0.6875-inch diameter with 0.0001-inch tolerance for high-precision gauging
• Grade 25 accuracy per AFBMA standards, suitable for dimensional inspection
• AFBMA certified for traceable quality assurance applications
• 63 RC hardness from full hardening heat treatment for durability and wear resistance
• Chrome steel construction provides consistent surface finish for reliable contact measurement

Compatibility

Designed as an OEM-style precision component for use in gauging fixtures, plug gauges, and inspection tooling that accepts 0.6875-inch diameter gage balls to Grade 25 tolerance specifications.

Installation Notes

Gage balls are typically handled and installed by metrology technicians or tool-and-die professionals. Use clean, lint-free gloves or handling tools to avoid contaminating the ball surface, as skin oils and debris can affect measurement accuracy. Store in a clean, dry environment away from corrosive agents. Do not use this component as a mechanical load-bearing element outside of its rated gauging application.