Gibraltar 826875-G Shoulder Tooling Ball Inspection

Product Description

The GIBRALTAR 826875-G is a shoulder-style inspection tooling ball designed for precision fixturing and gauging applications in machining and metrology environments. It features a 0.5 inch ball diameter with a 0.25 inch threaded shank, providing a stable, accurate reference point on jigs, fixtures, and inspection setups. The shoulder design locks the ball at a consistent height, with a ball center to shoulder bottom distance of 0.3125 inches and a ball center to shank bottom distance of 0.625 inches. Heat-treated steel construction and a ball-and-shank concentricity of 0.0002 inches ensure repeatable accuracy under production conditions. This part is installed by machinists and quality technicians.

This tooling ball is suited for use in inspection fixtures, coordinate measuring machine (CMM) setups, and production jigs where a precise, repeatable datum point is required. The tapped shank threads directly into a prepared hole, and the shoulder seats flush against the workpiece or fixture surface to set ball height without additional adjustment. The 6-32 threaded hole in the shank adds mounting versatility for complex fixture configurations. Typical applications include aerospace, automotive, and general precision machining environments where tight tolerances are maintained throughout the inspection process.

Key Features

• Shoulder design sets ball center height consistently at 0.3125 inches above the shoulder bottom
• Heat-treated steel construction for durability and dimensional stability under repeated use
• Ball-and-shank concentricity of 0.0002 inches for high-accuracy reference applications
• Tapped shank threads into fixture body for secure, repeatable installation
• 6-32 tapped hole in shank allows additional fixturing or stacking configurations
• Shoulder diameter of 0.49 inches provides a stable seating surface

Compatibility

Designed as an OEM-style replacement or direct-fit component for standard inspection fixture and tooling ball applications requiring a 0.25 inch threaded shank with a 0.5 inch ball diameter.

Installation Notes

Installation is performed by machinists or quality technicians using standard hand tools to thread the shank into a pre-tapped fixture hole. Ensure the mating hole thread is clean and free of debris before installation to maintain seating accuracy. Do not overtighten, as this may distort the shoulder seating surface and affect ball center height. Verify concentricity and position after installation using appropriate gauging equipment before placing the fixture into service.