Dongfeng KL truck parts Front right armrest assembly with hinge 8211520-C3100

The integrated hinge system is the core of the armrest’s functionality, enabling flexible adjustment to suit different driving postures and user preferences. It features a 180° rotation range: the armrest can be folded upward (to 90°) for easy entry/exit, folded downward (to 0°) for full arm support, or adjusted to 3 intermediate angles (30°, 60°, 120°) to match arm length or seating height. The hinge uses a friction-based locking mechanism with stainless steel springs that hold the armrest firmly in any position—no slipping or unexpected movement even on rough roads. Unlike fixed-position armrests that force users into uncomfortable postures, this multi-angle design reduces arm fatigue by 40% during long hauls, as drivers can adjust the support height to keep their elbows at a natural 90° angle

Designed to prioritize long-term comfort, the armrest features a layered padding structure and user-friendly surface. The core padding is made of high-density memory foam (50kg/m³ density) that conforms to the shape of the arm, distributing pressure evenly and reducing numbness from prolonged contact. The outer cover is a wear-resistant, breathable polyester fabric (280 GSM) with a textured finish—resisting stains from oil, sweat, or dirt and allowing air circulation to prevent arm sweating in warm weather. The armrest’s top surface is curved to match the natural contour of an arm, while the edges are rounded (no sharp corners) to avoid irritation. Unlike thin, hard armrests that cause discomfort after 1–2 hours, this ergonomic design supports comfortable use for 8+ hours of continuous driving

Built to withstand daily use and the vibration of truck operation, the assembly uses rugged materials for the hinge and structural frame. The hinge components (pins, brackets, springs) are crafted from stainless steel (304 grade) that resists rust and wear, enduring 100,000+ folding cycles (equivalent to 5 years of heavy use) without loosening or failure. The armrest’s internal frame is made of glass-fiber-reinforced PP plastic (20% GF content) that maintains rigidity under 50kg of pressure (well above the average arm weight of 3–5kg) and resists warping in temperature extremes (-40°C to 85°C). The mounting brackets are made of cold-rolled steel (Q235 grade) with a zinc-plated finish, ensuring secure attachment to the seat/door panel and resisting deformation from repeated adjustment. Unlike plastic-dominant armrests that break easily, this reinforced design ensures long-term reliability

Engineered for hassle-free replacement by fleet technicians or DIY owners, the armrest simplifies installation and upkeep. It includes all necessary hardware: 4 OEM-matched bolts (M6×20mm), lock washers, and a detailed mounting template that aligns with the seat/door’s pre-existing holes—no specialized tools or drilling required. Installation takes 20–30 minutes: simply align the armrest with the template, secure the bolts, and test the hinge rotation. For maintenance, the fabric cover is removable (via hidden zippers) and machine-washable, making it easy to clean or replace if heavily stained. The hinge requires no lubrication (pre-lubricated with lithium grease during manufacturing) and is sealed to prevent dust or debris from entering, eliminating the need for periodic servicing. Each unit undergoes strict testing: hinge durability trials (100,000 folds), weight-bearing testing (50kg for 24 hours), and fabric wear resistance testing. Backed by an 18-month warranty against manufacturing defects (e.g., hinge failure, frame cracking, fabric tearing), it provides Dongfeng KL truck owners with a comfortable, low-maintenance armrest solution