Dongfeng KR truck parts Front left armrest assembly with hinge 8211519-C5100

Designed to reduce driver arm fatigue during long-haul trips (8+ hours of continuous driving), the armrest features a contoured foam padding and optimal height/angle settings. The padding uses high-density polyurethane foam (40±3 kg/m³ density) with a 15mm-thick soft-touch PVC cover—providing firm support while conforming to the arm’s natural shape, reducing pressure points by 40% compared to flat armrests. The armrest’s default height (180mm from seat cushion) aligns with the driver’s elbow when resting in a relaxed steering position, while the 15° upward tilt angle prevents wrist strain during gear shifts. Unlike poorly designed armrests that cause discomfort or restrict movement, this ergonomic layout supports the driver’s upper body, enhancing focus and reducing fatigue on extended journeys

Built to withstand daily use (10+ adjustments per day) and minor impacts (e.g., accidental bumps from cargo), the assembly uses robust materials for the armrest body and hinge mechanism. The hinge is made of 2mm-thick zinc-plated steel (Q235 grade) with a precision-machined pivot pin (10mm diameter) that ensures smooth, rattle-free rotation (180° range: 90° upward for entry/exit, 90° downward for use). The hinge undergoes 50,000+ opening/closing cycle tests (equivalent to 5 years of heavy use) without wear or loosening. The armrest body is crafted from impact-resistant ABS plastic (UL94 V-0 flame-retardant rating) that tolerates temperature extremes from -30°C (cold cabs) to 80°C (sun-heated interiors) without cracking. Unlike plastic hinges that break or foam that collapses, this durable design maintains functionality and shape for 6+ years

Beyond basic arm support, the assembly integrates practical features to enhance in-cab convenience. The armrest’s top surface has a non-slip texture (PVC cover with 0.5mm raised patterns) that prevents items like smartphones or sunglasses from sliding during driving. The front edge includes a built-in 50mm×80mm storage pocket (lined with soft fabric to protect small items) for holding pens, toll tickets, or a USB charging cable. The hinge also has a locking mechanism that secures the armrest in 3 preset positions (0°, 45°, 90°) — preventing accidental movement while driving on rough roads. Unlike single-purpose armrests, this multi-functional design adds value to the cab interior, reducing clutter and keeping essential items within easy reach

Designed for hassle-free replacement by fleet technicians or DIY owners, the assembly simplifies installation and upkeep. It includes all necessary hardware: 4 OEM-matched stainless steel bolts, lock washers, and a foam gasket that reduces vibration transfer to the seat frame. Installation takes 10–15 minutes: locate the seat’s original armrest mounting holes, align the hinge with the bracket, tighten the bolts to 15 N·m torque, and test the hinge rotation. For maintenance, the PVC cover wipes clean with a damp cloth (resisting stains from coffee, oil, or dust), and the hinge requires no lubrication (pre-lubricated with lithium grease at the factory). If the foam padding wears over time, the cover is removable (via hidden clips) for easy replacement—no need to buy the entire assembly. Each unit undergoes hinge cycle testing, impact testing, and comfort verification, backed by a 24-month warranty against defects (e.g., hinge failure, plastic cracking, foam collapse)