Dongfeng GX truck parts Front suspension U-bolt 2901131-T78H0

Built to withstand the extreme mechanical stress of Dongfeng GX’s front suspension (supporting up to 80% of the truck’s gross vehicle weight during braking or rough terrain), the U-bolt is crafted from 40Cr high-strength alloy steel. After quenching and tempering heat treatment, it achieves a tensile strength of 1,000MPa and a yield strength of 800MPa—far exceeding the 600MPa standard for ordinary carbon steel U-bolts. This material can endure repeated dynamic loads (e.g., potholes, uneven roads) and static loads (heavy cargo) without stretching, bending, or breaking. Rigorous load testing confirms the U-bolt maintains structural integrity even under 120% of the Dongfeng GX’s maximum front axle load, making it reliable for long-haul or heavy-cargo transportation

Exposed to road salt, rain, mud, and humidity (common in front suspension environments), the U-bolt undergoes a three-step anti-corrosion treatment. First, a hot-dip galvanizing layer (85μm thickness) creates a dense zinc barrier against rust; second, a passivation coating enhances galvanization adhesion and resists white rust; third, a black oxide finish adds an extra layer of protection and improves aesthetic consistency with the suspension system. This combination enables the U-bolt to pass 1,000 hours of neutral salt spray testing without rust or coating peeling—double the industry average for truck suspension components. The coating also remains stable in extreme temperatures (-40°C to 200°C), ensuring no degradation from brake heat or winter road de-icing agents

To ensure secure and permanent fastening, the U-bolt features precision-rolled threads with a class 10.9 fit—providing tight engagement with OEM nuts and minimizing thread stripping risk. The thread surface is treated with anti-seize compound (high-temperature graphite-based), preventing galling during installation and ensuring easy removal for maintenance (even after years of use). Additionally, the U-bolt is compatible with Dongfeng GX’s original lock washers (double-sided serrated type), which bite into the leaf spring plate and nut to prevent loosening from vibration—critical for front suspension components that experience constant shaking. This design eliminates the need for retightening after initial installation, reducing maintenance downtime for fleet operators

Engineered for efficient use in truck repair shops, this U-bolt simplifies installation with user-friendly features. It comes with pre-applied anti-seize compound and is paired with OEM-matched nuts and lock washers (no separate parts required). The U-bolt’s smooth, burr-free ends prevent damage to leaf spring bushings during installation, and its consistent bend radius ensures it sits flush against the axle tube without gaps. To guarantee quality, each unit is manufactured in an IATF 16949 certified facility and undergoes strict inspections: dimensional checks via 3D coordinate measuring machines, tensile strength tests, thread gauge verification, and corrosion resistance testing. It also includes a 36-month warranty against manufacturing defects (e.g., thread damage, material cracking, or coating failure), providing Dongfeng GX truck owners with long-term peace of mind and reliable front suspension performance