K910-1 - Lincoln GC-300 300A Spring Ground Clamp

Lincoln Electric GC-300 Work Clamp (K910-1) Technical Overview

The Lincoln Electric GC-300 Work Clamp, identified by the internal SKU K910-1, is a robust grounding solution designed for professional welding applications requiring up to 300 amperes of current. Engineered for efficiency and reliability, this clamp features a high-tension spring mechanism that eliminates the manual labor associated with traditional screw-type clamps. The unit is rated for a 60% duty cycle at 300 amps, making it suitable for a wide range of industrial fabrication, maintenance, and repair tasks where consistent electrical conductivity is paramount.

Structurally, the GC-300 is built with a combination of steel and copper components to optimize both durability and electrical performance. The jaws are designed to open up to 2-1/2 inches (63 mm), providing ample clearance to attach to worktables, plate steel, pipes, and structural beams. The contact points are engineered to bite through surface contaminants like rust or paint to establish a solid earth connection, which is critical for maintaining a stable welding arc and preventing weld defects associated with poor grounding.

One of the key technical features of the K910-1 is its cable connection method. The welding cable lug bolts directly to the work clamp, ensuring a low-resistance path for the welding current. This direct connection reduces heat buildup at the terminal and maximizes the energy transfer to the arc. The clamp is specifically designed to accommodate #1 size welding cable. By removing the need for nuts and bolts to tighten the jaws to the workpiece, the GC-300 significantly reduces setup time, allowing operators to move the ground point quickly as they progress around large assemblies.

This work clamp is an essential accessory for welders in sectors such as construction, mining, and pipeline maintenance. Its rugged design withstands the harsh conditions of field environments while maintaining the mechanical integrity of the spring and hinge mechanism. Whether used in a shop setting or on a remote job site, the Lincoln GC-300 provides the dependable grounding necessary for high-quality welding results.