Gibraltar 826826 Shoulder Tooling Ball 1/2 in Press-fit

Product Description

The GIBRALTAR 826826 is a shoulder-style inspection tooling ball designed for precision fixturing and gauging applications in machine shops and manufacturing environments. The ball measures 0.5 inches in diameter and is mounted on a 0.3125-inch shank with a press-fit attachment. The ball center sits 0.5 inches above the shoulder bottom and 1.5 inches above the shank bottom. Heat-treated steel construction provides durability under repeated use. Ball and shank concentricity is held to 0.0002 inches, making this component suitable for high-accuracy inspection setups. Machinists and tooling technicians are the primary installers of this component.

This tooling ball is used in fixture plates, jigs, and coordinate measuring machine (CMM) setups where a repeatable, accurate reference point is required. The shoulder design provides a positive seating surface against the fixture body, ensuring consistent ball height after installation. Typical applications include production inspection fixtures in automotive, aerospace, and general precision machining environments. The press-fit shank is driven into a prepared hole in the fixture plate or body to a controlled depth.

Key Features

• 0.5-inch ball diameter with 0.0002-inch ball-to-shank concentricity for high-accuracy reference points
• Press-fit 0.3125-inch shank with tolerance of +0.0003 / -0.0000 inches for controlled interference fit
• Shoulder design seats flush against fixture surface for repeatable ball height
• Ball center to shoulder bottom: 0.5 inches; ball center to shank bottom: 1.5 inches
• Heat-treated steel construction for wear resistance and dimensional stability
• Non-tapped, non-breakaway shank — permanent press-fit installation

Compatibility

Designed as an OEM-style inspection tooling ball for use in standard fixture plates and gauging bodies machined to accept a 0.3125-inch press-fit shank.

Installation Notes

Installation is typically performed by a machinist or tooling technician. The receiving hole in the fixture must be precision-bored or reamed to match the press-fit shank tolerance before installation. Press the shank into the prepared hole using an arbor press or similar controlled force tool — do not hammer directly on the ball. Verify concentricity and seating against the shoulder after installation before placing the fixture into service.