Gibraltar 826877-G Shoulder Tooling Ball Inspection

Product Description

The GIBRALTAR 826877-G is a shoulder-style inspection tooling ball designed for precision measurement and gauging applications in machine shops and manufacturing environments. The 0.5-inch diameter hardened steel ball seats against a 0.49-inch shoulder, providing a repeatable datum reference surface for CMM setups, fixture alignment, and part inspection routines. The 0.25-inch threaded shank secures the ball into a tapped hole on a fixture or datum block. Ball-to-shank concentricity is held to 0.0002 inches, making this a reliable reference component for tight-tolerance inspection work. Typically installed by quality technicians, tooling engineers, or skilled machinists.

This tooling ball suits inspection and fixturing setups in precision manufacturing environments, including automotive, aerospace, and general metalworking shops. The shoulder design provides a positive stop for consistent seating depth, ensuring repeatable positioning across multiple setups. The threaded shank attachment allows straightforward installation and removal without special tooling. The ball center sits 0.3125 inches above the shoulder bottom and 0.625 inches above the shank bottom, giving predictable geometry for offset calculations in CMM programming and manual inspection workflows.

Key Features

• 0.5-inch diameter precision ball for CMM and fixture inspection use
• Shoulder design provides a positive, repeatable seating stop at 0.49-inch shoulder diameter
• Ball and shank concentricity held to 0.0002 inches for high-accuracy reference
• Heat-treated steel construction for durability and wear resistance
• 0.25-inch threaded shank for secure installation in tapped fixture holes
• Non-breakaway, non-tapped-shank configuration keeps the design simple and rigid

Compatibility

Designed as an OEM-style inspection tooling ball for use with standard fixture plates, datum blocks, and CMM fixtures accepting a 0.25-inch threaded shank.

Installation Notes

Installation is performed by tooling engineers or quality technicians using standard hand tools appropriate for the threaded shank size. Ensure the mating tapped hole is clean and free of debris before threading the shank in, and torque only to snug seating against the shoulder to avoid thread damage. Do not force the ball past the shoulder stop, as this can compromise the seating datum. Verify ball seating and concentricity with a dial indicator after installation if the application requires certified datum accuracy.