Dongfeng KL truck parts Hinge assembly toolbox 5407021-C3300

Built as the core load-bearing component for toolbox lids, this hinge assembly features a robust structural design to withstand repeated use. The hinge body and pin are forged from 45# medium carbon steel (tensile strength 600MPa), capable of supporting a static load of 200N—easily bearing the weight of fully loaded toolbox lids (up to 50kg) and resisting deformation during frequent opening/closing. A precision-machined brass bushing (inner diameter 15mm) is embedded in the hinge knuckle, reducing friction between the pin and body by 40% and enabling smooth rotation. The hinge’s dual-knuckle design distributes stress evenly, preventing fatigue cracks even after 100,000+ opening cycles (equivalent to 300,000km of typical operation)

Engineered to resist corrosion and wear in the harsh outdoor conditions of truck toolboxes, the 5407021-C3300 hinge adopts a multi-layer protective treatment. The entire assembly undergoes zinc-nickel alloy plating (15μm thickness) for superior rust prevention, followed by a clear passivation coating that enhances corrosion resistance by 50% compared to standard zinc plating. This system passes 2000-hour neutral salt spray testing (ASTM B117) with no rust—ideal for coastal regions, snowy areas (road salt exposure), and construction sites with high humidity. The brass bushing is self-lubricating, eliminating the need for periodic oiling and ensuring smooth operation even after years of use without wear-induced seizing

Optimized to eliminate noise caused by cab vibration, the hinge assembly integrates dedicated dampening features. A rubber O-ring (EPDM material) is installed between the hinge knuckles, absorbing vibration from the truck’s chassis (10-500Hz) and preventing metal-to-metal contact that causes rattling. The O-ring also acts as a dust seal, blocking debris from entering the hinge mechanism and extending service life. The precision fit between the pin and bushing (clearance ≤0.1mm) ensures the toolbox lid remains stable during driving, avoiding excessive movement that could lead to lid damage or accidental opening. These features reduce in-cab and exterior noise by 35%, enhancing driver comfort during long hauls

This toolbox hinge assembly is designed for efficient installation and long-term cost savings for Dongfeng KL operators. The pre-assembled structure (hinge body + pin + bushing + mounting hardware) allows a single technician to complete replacement in 30 minutes using only a socket wrench—no specialized tools or welding required. The OE-compatible design ensures perfect alignment with the toolbox lid and casing, avoiding the misalignment issues of aftermarket hinges that cause lid jamming or water leakage (repair costs up to $300). The durable steel construction and corrosion-resistant coating extend the hinge’s service life to ≥500,000km—twice that of non-OE alternatives. Backed by a 2-year/250,000km Dongfeng warranty, it provides reliable toolbox operation and predictable maintenance expenses for fleet operations