Gibraltar 826811-G Inspection Tooling Ball 3/8 in Press-fit

Product Description

The GIBRALTAR 826811-G is a shoulder-style inspection tooling ball used in precision measurement and fixturing applications. The 0.375-inch diameter ball sits on a 0.1875-inch diameter press-fit shank, with a ball center to shoulder bottom distance of 0.3 inches and a ball center to shank bottom distance of 0.75 inches. Heat-treated steel construction provides the hardness and dimensional stability required for repeatable inspection work. Ball and shank concentricity is held to 0.0002 inches, supporting accurate datum referencing in CMM fixtures, jigs, and gauging setups. Machinists and metrologists install this part as a fixed reference point in precision tooling assemblies.

This inspection tooling ball is suited for use in machine shop and manufacturing environments where repeatable positional references are required. It installs via press-fit into a prepared bore in a fixture plate, CMM tombstone, or inspection jig. The shoulder design provides a positive stop at installation depth, ensuring consistent ball centerline location across multiple units. Applications include coordinate measuring machine fixtures, assembly jigs, and part-location gauging setups.

Key Features

• 0.375-inch ball diameter with 0.0002-inch ball and shank concentricity for precise datum referencing
• Press-fit shank attachment for secure, repeatable installation in prepared bores
• Shoulder design provides a positive depth stop during installation
• Heat-treated steel construction for hardness and dimensional stability
• 0.3-inch ball center to shoulder bottom and 0.75-inch ball center to shank bottom dimensions

Compatibility

Designed as an OEM-style inspection tooling ball for use in precision fixturing, CMM setups, and gauging assemblies requiring a 0.1875-inch press-fit shank bore.

Installation Notes

Installation is performed by machinists or metrology technicians using a press or arbor to drive the shank into a precision-bored hole. Ensure the receiving bore is machined to the correct tolerance to accept the press-fit shank without distorting the ball geometry. Do not hammer the ball directly. Verify seating against the shoulder before use to confirm consistent ball centerline height.