K639-4 - Lincoln Electric SHMS-400 Magnetic Fume Extraction Nozzle

Technical Overview of the Lincoln Electric K639-4 SHMS-400

The Lincoln Electric K639-4 SHMS-400 is a specialized low-noise suction nozzle designed for high-efficiency source capture of welding fumes. Engineered for industrial environments, this component is constructed from high-grade aluminum, offering a superior balance of durability and lightweight handling compared to plastic alternatives. The nozzle measures 400 mm (16 inches) in length, providing significant reach to access confined or difficult-to-position weld joints while maintaining a safe distance from the arc.

A key technical feature of the SHMS-400 is its integrated magnetic mounting system. This allows the operator to affix the nozzle directly to the workpiece or welding bench, ensuring stability during operation. The magnetic base eliminates the need for complex clamping mechanisms or external stands, streamlining the setup process for temporary or fixed welding stations. The unit is designed with internal aerodynamics that reduce turbulence, resulting in a "low noise" operation profile that contributes to a safer and more comfortable working environment.

The K639-4 is supplied with the S20591-7 adapter, which facilitates immediate connection to standard 1-3/4 inch (45 mm) vacuum hoses. This compatibility ensures integration with a wide range of Lincoln Electric fume extraction systems, including portable Miniflex units and central systems utilizing compatible hose diameters. The nozzle is engineered for an optimal capture distance of 1-1/2 inches (38 mm) from the source, maximizing the face velocity and capture efficiency of particulate matter and gases generated during the welding process. This precise specification aids in maintaining compliance with occupational safety standards regarding air quality control.

Maintenance and longevity are inherent to the design. The aluminum body resists heat and spatter better than composite materials, reducing the frequency of replacement due to thermal damage. The simple, robust construction minimizes potential failure points, making the K639-4 a reliable accessory for continuous industrial use in MRO, fabrication, and heavy manufacturing sectors.