Jergens 29012 Shoulder Tooling Ball 3/8 in Checking Ss

Product Description

The JERGENS 29012 is a shoulder-style checking tooling ball designed for precision fixturing and inspection applications in manufacturing environments. With a 0.3750-inch ball diameter and a 0.1872-inch shank diameter, this tooling ball delivers tight dimensional control with a ball tolerance of 0.0002 inches and a shank tolerance of +0.0000 / -0.0002 inches. Constructed from heat-treated stainless steel, it provides durability and corrosion resistance in demanding shop conditions. The shoulder design establishes a precise datum reference point, and the breakaway feature allows controlled deflection to protect both the ball and the workpiece during gauging operations. Machinists, tooling engineers, and quality technicians install this component in jigs, fixtures, and CMM setups.

This tooling ball is suited for use in precision checking fixtures, inspection gauges, and production tooling where repeatable ball positioning is required. The shoulder seats against a mating surface to set ball center height, making it well-suited for modular fixturing systems and dedicated checking fixtures in medium to high-volume manufacturing cells. The 0.3000-inch ball center to shoulder bottom dimension and 0.7500-inch ball center to shank bottom dimension are critical references for fixture designers laying out datum schemes.

Key Features

• Checking-style tooling ball for use in inspection fixtures and gauging setups
• 0.3750-inch ball diameter with 0.0002-inch ball tolerance for tight positional accuracy
• 0.1872-inch shank diameter with +0.0000 / -0.0002-inch shank tolerance for press or slip fit installation
• Shoulder design provides a positive seating surface and precise ball center height reference
• Breakaway feature protects the ball and fixture from damage during accidental contact
• Heat-treated stainless steel construction for hardness, wear resistance, and corrosion resistance
• Ball and shank concentricity held to 0.0002 inches

Compatibility

Designed as an OEM-style replacement or new-installation component for precision checking fixtures and modular tooling systems that accept a 0.1872-inch shank diameter tooling ball with a shoulder stop.

Installation Notes

Installation is typically performed by tooling engineers or skilled machinists during fixture build or maintenance. The shank is pressed or slip-fit into a prepared bore; ensure the bore diameter is matched to the specified shank tolerance before installation. Clean the mating bore thoroughly before pressing to avoid contamination that could affect positional accuracy. Do not apply excessive force that could deform the shoulder seating surface or affect ball concentricity.