Gibraltar 826887-G Shoulder Tooling Ball 12 Mm Inspection

Product Description

The GIBRALTAR 826887-G is a shoulder-style tooling ball designed for precision inspection work in manufacturing and metrology environments. The ball measures 12 mm in diameter with a 6 mm threaded shank, a ball center to shank bottom distance of 22 mm, and a ball center to shoulder bottom distance of 12 mm. The shoulder diameter is 12.50 mm. Constructed from heat-treated steel, this tooling ball provides consistent, repeatable positioning accuracy. Ball and shank concentricity is held to 0.0002 inch, making it suitable for applications where tight positional tolerances are required. It is installed by machinists, tool and die makers, and quality technicians.

This tooling ball is used in fixture building, coordinate measuring machine (CMM) setups, and general inspection workflows where a reliable, fixed reference point is needed. The threaded shank attachment allows secure installation into tapped fixtures or inspection plates. The shoulder design provides a positive stop for consistent seating depth, reducing setup variation between measurements or fixture assemblies. It is well suited to production environments where tooling balls are installed and removed repeatedly.

Key Features

• 12 mm precision steel ball for inspection and fixture reference applications
• Heat-treated steel construction for hardness and dimensional stability
• Threaded shank attachment type for secure, repeatable installation
• Shoulder design provides a positive stop at 12 mm ball center to shoulder bottom
• Ball and shank concentricity of 0.0002 inch for high-accuracy positioning
• No breakaway feature — fixed ball configuration for stable reference use

Compatibility

Designed as a standard shoulder tooling ball for use in threaded fixture plates, CMM setups, and inspection tooling systems that accept a 6 mm threaded shank.

Installation Notes

Installation is performed by machinists or quality technicians using standard hand tools appropriate for the shank thread size. Ensure the mating fixture or plate is tapped to the correct thread specification before installation. Seat the shank fully until the shoulder contacts the mounting surface to achieve the designed ball center height. Avoid over-torquing the shank, as this can stress the ball-to-shank joint and affect concentricity.