Dongfeng KL truck parts Front left armrest assembly with hinge 8211519-C3100

The integrated hinge system is designed for maximum flexibility, supporting 180° rotation to adapt to diverse driving scenarios. It can be folded upward to 90° (to free up space for entering/exiting the cab), lowered to 0° (providing full arm support during long drives), or locked at 30°, 60°, or 120° (to match the driver’s seating height or arm posture). The hinge uses a stainless steel ratchet mechanism with 5 locking positions, each engaging with a 50N holding force to prevent slipping—even on rough roads with heavy vibration. Unlike fixed or limited-adjustment armrests that force drivers into rigid postures, this design allows customization, reducing shoulder and elbow fatigue by 45% during 8+ hour hauls. The hinge also features a soft-close function, preventing loud slamming when folding and extending component lifespan

Crafted to prioritize long-term driver comfort, the armrest’s contact surface combines layered padding and breathable materials. The core is a 30mm-thick high-resilience memory foam (density 55kg/m³) that conforms to the arm’s shape, distributing pressure evenly to avoid numbness. The outer cover is a durable, air-permeable polyester mesh (300 GSM) with a anti-slip texture—resisting stains from sweat, oil, or coffee and promoting air circulation to keep arms cool in warm weather. The armrest’s top edge is contoured at a 15° angle to match the natural slope of a relaxed arm, while the sides are tapered to avoid digging into the torso when the driver shifts positions. Unlike thin, hard plastic armrests that cause discomfort after short use, this ergonomic design maintains comfort even during extended periods of contact

Built to withstand the rigors of commercial truck use—including constant vibration, temperature fluctuations, and daily wear—the assembly uses rugged, long-lasting materials. The hinge’s pins, brackets, and springs are made of 304 stainless steel (corrosion-resistant, tensile strength 515 MPa) that endures 150,000+ folding cycles without rusting or loosening. The armrest’s internal frame is glass-fiber-reinforced ABS plastic (25% GF content) that resists warping in temperatures ranging from -40°C to 90°C and supports up to 60kg of static load (well above average arm weight). The mounting brackets are cold-rolled steel (Q345B grade) with a zinc-plated finish, ensuring secure attachment to the seat frame and resisting deformation from repeated adjustment. Unlike lightweight plastic armrests that crack easily, this reinforced structure guarantees reliability for 5+ years of heavy use

Engineered for hassle-free replacement by fleet technicians or DIY owners, the armrest simplifies installation and upkeep. It includes all required hardware: 4 OEM-specification self-tapping bolts (M6×25mm), lock washers, and a printed alignment guide that matches the seat bracket’s pre-drilled holes—no drilling, welding, or specialized tools needed. Installation takes 20–25 minutes: align the armrest with the guide, tighten the bolts to 8 N·m torque, and test hinge rotation. For maintenance, the mesh cover is removable via hidden hook-and-loop fasteners, allowing machine washing (30°C cycle) to remove stains. The hinge is pre-lubricated with lithium-based grease (lasting the component’s lifespan) and sealed with rubber gaskets to block dust and debris, eliminating the need for periodic re-lubrication. Each unit undergoes strict testing: hinge durability trials, weight-bearing tests (60kg for 24 hours), and temperature cycling. Backed by a 24-month warranty against defects (e.g., hinge failure, foam degradation, cover tearing), it provides Dongfeng KL truck owners with a reliable, comfortable driver-side armrest solution