Dongfeng KR truck parts Front roof right floor panel 5704030-C5100

Built to reinforce the cab’s front roof and right-side floor—critical for impact resistance and load-bearing—the panel uses high-grade structural steel. The base material is 2.5mm-thick cold-rolled steel (Q345B grade) with a tensile strength of 470–630 MPa, capable of withstanding static loads of 800kg (e.g., from overhead cargo or roof-mounted accessories) without deformation. The panel’s edges are reinforced with 5mm-thick folded flanges that distribute stress across the cab frame, enhancing rigidity and preventing flexing during rough driving (e.g., off-road terrain). Unlike thin mild steel panels that dent or crack under impact, this heavy-duty design acts as a structural backbone for the front roof, supporting the cab’s crash safety performance (meeting ECE R29 cab strength standards) and ensuring long-term durability

Engineered to resist corrosion from rain, road salt, humidity, and UV radiation—critical for exterior and underbody-exposed panels—the panel features a comprehensive four-stage anti-corrosion treatment. First, it undergoes hot-dip galvanization (zinc coating thickness ≥90μm) to create a base rust barrier. Next, an electrophoretic primer (70μm thickness) is applied for enhanced adhesion and moisture resistance, followed by a high-build epoxy intermediate coat (60μm) to fill surface imperfections. Finally, a polyester topcoat (50μm thickness, matching the cab’s original paint color) provides scratch resistance and UV protection. This coating system passes 1,200 hours of neutral salt spray testing (equivalent to 10 years of road salt exposure) without rust, peeling, or fading—far exceeding the lifespan of single-layer painted panels that corrode within 2–3 years

Designed to prevent water intrusion and wind noise, the panel integrates specialized sealing features. The mating flanges are pre-coated with automotive-grade butyl rubber sealant (1.5mm thickness) that melts during welding, creating a permanent waterproof bond between the new panel and existing cab structure. The panel’s surface is laser-cut with precision drainage channels (5mm width) along the right-side floor edge, redirecting rainwater or condensation toward the cab’s existing drain holes—preventing pooling that causes floor rust. Additionally, the front roof section includes a 20mm-wide foam weatherstrip groove that accommodates the original cab’s rubber weatherstrip, blocking wind and water from entering through the front roof-firewall joint. Unlike poorly sealed panels that develop leaks or drafts, this design ensures the cab remains dry and quiet in heavy rain or high-speed driving

Designed for easy installation by professional body shops or fleet technicians, the panel simplifies the replacement process with welding-friendly features. All mounting holes are pre-drilled (8mm diameter) and deburred to accept OEM-spec M8×20mm bolts, and the flanges are marked with laser-etched welding guides (10mm weld spacing) to ensure proper joint strength. The panel’s surface is pre-cleaned and treated with a weldable primer, eliminating the need for additional surface preparation before welding. It is fully compatible with the Dongfeng KR’s original cab hardware (e.g., roof rack mounting brackets, floor trim clips), requiring no adapter parts. Installation typically takes 2–3 hours (including welding and finishing), and the panel’s contour matches the original so closely that minimal paint blending is needed. Each unit undergoes dimensional verification via CMM, load-bearing testing, and corrosion resistance checks, backed by a 36-month warranty against defects (e.g., rusting, warping, flange cracking)