Dongfeng KR truck spare parts Steering arm 3412011-KRAE0

Built to bear the high torque and impact loads of truck steering systems, this steering arm is crafted from 40Cr alloy steel via precision forging—offering a tensile strength of 980MPa and yield strength of ≥785MPa, far exceeding the performance of cast steel alternatives. The forging process eliminates internal pores and grain defects, ensuring uniform material density and enhancing fatigue resistance. Finite element analysis (FEA) confirms it can withstand a maximum steering torque of 1200N·m (equivalent to the force of heavy-duty cornering) and 500,000 fatigue cycles (ISO 12107 standard) without deformation or cracking. The 25mm-thick force transmission zone is further reinforced via quenching and tempering, achieving a surface hardness of HRC35-40 to resist wear at the tie rod connection

Engineered for precise steering transmission, the steering arm features CNC-machined key surfaces with strict dimensional tolerances. The M22 tie rod threaded hole undergoes rolling tapping, achieving a thread precision grade of 6H and ensuring a tight fit with no backlash—critical for avoiding steering play. The bolt holes for knuckle mounting have a position tolerance of ±0.1mm, guaranteeing the arm is perfectly aligned with the steering knuckle, which maintains the truck’s toe-in/toe-out parameters within ±2mm. The arm’s steering pivot surface is ground to a flatness of ≤0.05mm, reducing friction with the knuckle and ensuring smooth, responsive steering—even after 100,000km of use, the steering accuracy remains within Dongfeng’s factory specifications

Designed for the exposed undercarriage environment (mud, road salt, stone impacts), the steering arm features a multi-layer protective treatment. It undergoes phosphatization to remove rust, followed by cathodic electrophoretic coating (100μm thickness) and black oxide finish—forming a dense, wear-resistant layer that resists corrosion and impact. This coating passes 2000-hour neutral salt spray testing (ASTM B117) with no red rust, ensuring durability in coastal high-salt areas and snowy regions where road salt is used. The threaded hole and pivot surface are treated with anti-seize compound, preventing thread jamming and ensuring easy disassembly during maintenance. Even in dusty construction sites, the arm remains free from corrosion-related performance degradation

Optimized for efficient fleet maintenance and safety, the steering arm features a user-friendly design and complies with ISO 14229 steering safety standards. The 6 M16 bolt holes align perfectly with the knuckle’s original mounting points, using grade 10.9 high-strength bolts that require a torque of 180-200N·m for secure fixation—standard tools are sufficient for installation. A single technician can complete replacement in 45 minutes, 40% faster than non-OE arms. The arm’s surface is laser-etched with installation marks (“FRONT”/“LEFT/RIGHT”) to prevent reverse installation, and it undergoes 100% quality inspection (including magnetic particle testing) to detect hidden cracks—ensuring no defective parts reach the market. With a service life of ≥250,000km, it minimizes replacement frequency and ensures consistent steering safety for fleet operations