KP4003-1 - Lincoln Electric VIKING 4x5 Shade 11 Glass Filter Plate

Technical Specifications and Compatibility

The Lincoln Electric KP4003-1 is a precision-manufactured replacement filter plate designed to restore the protective capabilities and visual clarity of industrial passive welding helmets. Specifically engineered for the Lincoln Electric VIKING™ K3371-1 Industrial Passive™ Black Welding Helmet, this component ensures seamless integration and maintains the helmet's safety rating. The plate measures a standard 4 inches by 5 inches, a common dimension for passive industrial hoods, providing a wide field of view for the operator. Unlike polycarbonate alternatives, this filter plate is constructed from high-quality glass, which offers distinct advantages in terms of optical fidelity and resistance to pitting from spatter, although care must be taken to prevent impact breakage.

This filter plate features a fixed Shade 11 darkness level, making it suitable for a wide range of amperage settings in Stick, TIG, and MIG welding processes where a variable shade is not required. The consistent density of the shade ensures uniform protection across the entire viewing area, eliminating bright spots or uneven filtration that can lead to eye fatigue. The unit is rigorously tested and certified to meet both ANSI Z87.1 and CSA Z94.3 standards, guaranteeing that it provides the necessary filtration of ultraviolet (UV) and infrared (IR) radiation generated during the welding arc. For safety managers and procurement specialists, the KP4003-1 represents a compliant, OEM-quality replacement part that ensures equipment remains within safety specifications.

Installation of the KP4003-1 is straightforward, fitting directly into the retention mechanism of the K3371-1 helmet. The glass substrate is precision-cut to prevent rattling or light leakage around the edges when properly seated. It is recommended to use this filter plate in conjunction with appropriate clear cover lenses (inner and outer) to protect the glass from direct impact and heavy spatter accumulation, thereby extending the service life of the filter. This product is sold individually as a single unit.