NT665 - 600A Heavy Duty C-Style Welding Ground Clamp

Industrial Grade Grounding Solution

The Weld-Mate NT-665 is a heavy-duty 600 Amp C-Clamp Ground Clamp designed for professional industrial applications where electrical stability is paramount. In high-amperage welding processes, the quality of the ground connection is often the differentiating factor between a sound weld and a defect. This unit utilizes a classic C-clamp mechanism, which provides a mechanical advantage allowing the operator to apply significant torque when securing the clamp to the workpiece. Unlike spring-loaded clamps that can lose tension over time or slip on irregular surfaces, the NT-665 ensures a rigid, immovable connection.

Constructed from high-conductivity copper alloy materials, this ground clamp is engineered to handle continuous loads up to 600 amps without excessive heat generation. Heat at the contact point is a primary cause of voltage drop in the welding circuit, which can lead to inconsistent arc characteristics and poor penetration. The large surface area of the contact pads on the NT-665 maximizes current transfer efficiency, maintaining the integrity of the welding parameters set at the power source.

The design features a robust threaded screw and a sliding T-handle, allowing for easy operation even when wearing heavy welding gloves. The frame is reinforced to withstand the mechanical stress of daily industrial use, resisting deformation under load. This clamp is particularly suited for structural steel fabrication, shipbuilding, and heavy equipment repair where the ground must be attached to thick plates or beams. It accommodates standard cable lugs, ensuring compatibility with existing welding cable setups ranging from 1/0 to 4/0 gauge.

Reliability in the welding circuit begins with the ground. The Weld-Mate NT-665 offers the durability and performance required for demanding environments, reducing downtime caused by equipment overheating or connection failures. It is an essential component for any welding station operating in the upper amperage ranges.