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New 100% 12*12 Semi Trailer Steel Leaf Spring Suspensions Used Parts & Accessories for Sale

The Leaf Spring Suspension is a traditional yet highly reliable type of vehicle suspension system widely used in commercial vehicles, trucks, trailers, buses, and off-road equipment. It consists of multiple layers (leaves) of spring steel bound together to support vertical loads, absorb road shocks, and maintain axle alignment. Known for its durability, high load-carrying capacity, and simple maintenance, leaf spring suspensions are ideal for heavy-duty applications where robustness and cost-effectiveness are essential.

Modern leaf springs are engineered using advanced materials and heat treatment processes to enhance fatigue resistance, ride comfort, and service life. They can be configured in various arrangements such as multi-leaf, parabolic, or mono-leaf designs depending on performance requirements.
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  • Trailer Parts

Attribute Description
Product Name Leaf Spring Suspension
Type Multi-Leaf, Parabolic, Mono-Leaf
Material High-Tensile Alloy Steel (e.g., SUP9, 51CrV4, SAE 5160)
Application Trucks, Trailers, Buses, Commercial Vehicles, Off-Road & Agricultural Equipment
Axle Position Front and Rear Axle Suspensions
Load Capacity Light-duty to Heavy-duty (2,000 kg – 20,000 kg per axle, depending on design)
Mounting Style Over-Slung (above axle), Under-Slung (below axle), or Equalized (tandem)
Eye Type Fixed Eye, Slipper Eye, Bushed Eye, or Spring Seat
Bushings Rubber, Nylon, or Polyurethane (reduces friction and noise)
Center Bolt Location Center-aligned for proper axle positioning
Damping Mechanism Often integrated with shock absorbers or used with friction between leaves
Corrosion Protection Painted, Zinc-Coated, or Powder-Coated Finish
Rebound Clip Equipped Yes (prevents leaf separation during rebound)
Design Standard Complies with SAE J173, ISO 8717, GB/T 28939 (China), ECE R89
钢板-1


钢板-2


Parameter Value / Range
Free Length 800 mm – 2,500 mm (varies by model)
Arc Height (Loaded/Unloaded) 120 mm – 300 mm
Width of Main Leaf 60 mm – 100 mm
Thickness (Total Pack) 30 mm – 70 mm
Number of Leaves 3 – 12 (multi-leaf); 1 (parabolic/mono-leaf)
Spring Rate (Stiffness) 80 N/mm – 350 N/mm (depending on application)
Maximum Deflection 150 mm – 250 mm
Operating Temperature Range -40°C to +120°C
Fatigue Life (Cycle Test) ≥ 300,000 cycles under rated load (lab conditions)
Surface Hardness HRC 40–50 (after heat treatment)
Heat Treatment Quenched and Tempered


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