Lincoln Electric KP4470-1 VIKING X6 Headgear Assembly is an OEM replacement headgear designed to restore proper fit, comfort, and stability on compatible Lincoln VIKING welding helmets. The X6 platform uses a 6-point adjustment system to help distribute weight evenly and reduce pressure during long shifts, with a slide-adjust fit for quick sizing changes. This assembly is built to fit VIKING 3350, 2450, 1840, and 1740 helmet models (verify your exact helmet model and headgear mounting style before ordering), making it a practical replacement when your original headgear is worn, loose, or no longer holding adjustment.