Gibraltar 826820-G Inspection Tooling Ball 1/2 in Slip-fit

Product Description

The GIBRALTAR 826820-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 and a 0.25-inch slip-fit shank, allowing controlled insertion into matching receiver bushings without threading. The shoulder design provides a positive stop for consistent ball center positioning. Ball and shank concentricity is held to 0.0002 inches, supporting repeatable datum referencing. The component is heat-treated steel construction throughout. This part is installed and serviced by machinists, tooling engineers, and metrology technicians working in precision manufacturing settings.

This tooling ball is suited for use in jigs, fixtures, and coordinate measuring machine (CMM) setups where a repeatable, accurate datum point is required. The slip-fit shank seats into a standard 0.25-inch receiver hole. Ball center to shoulder bottom measures 0.5 inches, and ball center to shank bottom measures 1.375 inches, providing a defined stack height for fixture layout calculations. Applicable in both production tooling and inspection fixture builds across general machining, aerospace, and automotive manufacturing environments.

Key Features

• 0.5-inch ball diameter with 0.0002-inch ball-to-shank concentricity for precise datum referencing
• Slip-fit 0.25-inch shank with tolerance of +0.0000 / -0.0004 inches for controlled seating
• Shoulder design provides a positive stop at 0.5 inches from ball center to shoulder bottom
• Heat-treated steel construction for durability in production and inspection environments
• No tapped shank and no breakaway feature — straightforward slip-in installation

Compatibility

Designed as an OEM-style replacement or direct-fit component for standard 0.25-inch receiver bushings used in precision fixturing and inspection setups.

Installation Notes

Installation is performed by tooling technicians or metrologists during fixture assembly or maintenance. Ensure the receiver bushing bore is clean and free of chips or burrs before inserting the shank to avoid damage to the slip-fit tolerance. No threaded engagement is used — the shoulder acts as the positive locating stop. Follow facility-specific fixture qualification procedures to verify ball center location after installation.