Dongfeng GX Shock absorber assy 2921010-H12B0 in stocked

Depending on the specific Dongfeng GX variant, the assembly adopts either a high-efficiency monotube or optimized twin-tube structure—both designed to deliver superior shock absorption. For monotube versions: A single pressure tube houses the piston, hydraulic oil, and nitrogen gas chamber (pressurized at 2-3 MPa), enabling faster response to road vibrations and reducing oil foaming (a common cause of performance fade). For twin-tube versions: An inner working tube (holding the piston and oil) and an outer reservoir tube (storing excess oil and gas) work together to handle high loads while keeping the assembly compact. Both designs include a precision-machined piston rod with a smooth surface finish (Ra ≤ 0.2μm) to minimize friction and ensure consistent damping

Piston Rod: Constructed from high-strength chrome-plated carbon steel (SCM435 or equivalent) with a chrome layer thickness of ≥ 0.05mm. This material combination provides exceptional tensile strength (≥ 1000 MPa) and resistance to scratches, rust, and corrosion—even in harsh environments (e.g., road salt, heavy rain, or dusty off-road conditions).

Pressure/Reservoir Tubes: Made from seamless cold-rolled steel (ST52-3) with a powder-coated outer layer (epoxy or polyester-based) that enhances corrosion resistance and withstands temperature extremes (-40°C to 120°C).

Sealing Components: Equipped with high-performance nitrile rubber (NBR) or fluororubber (FKM) seals and O-rings. These materials resist degradation from hydraulic oil, ozone, and high temperatures, ensuring long-term leak-free operation and maintaining damping efficiency over time.

Mounting Brackets: Fabricated from stamped steel with a galvanized or zinc-plated finish, providing strong load-bearing capacity and preventing rust at the connection points

The shock absorber assembly features multi-stage damping adjustment (calibrated specifically for Dongfeng GX’s weight and suspension setup) to balance ride comfort and vehicle stability:

Low-Speed Damping: Tuned to absorb small vibrations from uneven road surfaces (e.g., gravel, potholes) and reduce body sway during low-speed driving, enhancing passenger comfort.

High-Speed Damping: Optimized to control rapid suspension movements (e.g., sudden bumps, high-speed cornering) by increasing damping force—preventing excessive wheel bounce, maintaining tire contact with the road, and improving steering responsiveness and overall handling safety.

Compression/Extension Damping Balance: The piston valve is designed with different orifice sizes for compression (when the shock absorber is pushed in) and extension (when it rebounds), ensuring smooth, controlled movement in both directions and reducing harsh impacts transmitted to the vehicle’s chassis

This assembly meets or exceeds global automotive quality standards, including China’s GB/T 18831 (standards for automotive shock absorbers), ISO 7681 (testing methods for shock absorber performance), and IATF 16949 (automotive quality management system requirements). Each unit undergoes a series of strict quality inspections before leaving the factory:

Damping Force Testing: Using a shock absorber dynamometer to verify that damping force values (at different piston speeds) fall within ±5% of the OEM specifications.

Leakage Testing: Submerging the assembly in a pressure chamber (pressurized to 0.5 MPa) for 60 minutes to check for oil leaks.

Durability Testing: Simulating 200,000+ cycles of suspension movement (mimicking 100,000+ km of real-world driving) to ensure no structural failure, oil leakage, or significant damping force decay.

Environmental Testing: Exposing samples to salt spray (500 hours), high-temperature (120°C for 100 hours), and low-temperature (-40°C for 100 hours) conditions to validate corrosion resistance and performance stability.

Additionally, the assembly is backed by a manufacturer’s warranty (typically 12 months or 20,000 km), providing customers with assurance of its reliability and long service life in Dongfeng GX vehicles