RK-6 - RK-6 Replacement Head for Bernard 600A Shortstub Holder

Industrial Grade Replacement for Heavy-Duty Holders

The RK-6 Replacement Head is a precision-engineered component designed to restore the operational efficiency of Bernard-style 600 Amp Shortstub electrode holders. In heavy industrial environments such as shipyards, foundries, and structural steel fabrication, the electrode holder is subjected to extreme thermal cycling and mechanical stress. Over time, the head of the holder—which serves as the primary contact point for the welding rod—can degrade, leading to increased electrical resistance, overheating, and poor arc starts. This aftermarket replacement head offers a robust solution, manufactured to meet the rigorous demands of high-amperage Shielded Metal Arc Welding (SMAW).

Fabricated from a premium copper alloy, the RK-6 ensures maximum electrical conductivity, which is essential when managing currents up to 600 amps. A worn head can act as a resistor, generating excess heat in the welder's hand and reducing the effective voltage at the arc. By installing a new RK-6 head, operators can ensure that the full welding current is delivered to the electrode, resulting in consistent penetration and bead quality. The head features the signature screw-type clamping mechanism inherent to the Shortstub design. This system applies significantly more torque to the electrode than standard spring-loaded tongs, ensuring a slip-free grip and solid electrical connection even when manipulating heavy rods in out-of-position welds.

A key technical advantage of this replacement head is its support for the Shortstub's material efficiency. The design allows welders to consume electrodes down to a 2-inch stub, significantly reducing consumable waste compared to tong-style holders which often require a longer discard length. This efficiency translates to substantial cost savings over the lifecycle of the equipment. The RK-6 is designed for seamless compatibility with the Model 600 body and insulator assembly, allowing for quick field maintenance and minimal downtime.