Product Introduction
The fifth wheel (also known as the coupling saddle or tractor coupling) is the core load-bearing and towing component connecting the tractor unit to the semi-trailer. Mounted at the rear of the tractor, it engages precisely with the trailer's kingpin via a locking mechanism. It performs critical functions-including towing, steering, load-bearing, and shock absorption-making it essential for the safe operation of the semi-trailer.
The product comes in two mainstream specifications-the "50#" (standard-duty) and "90#" (heavy-duty) models-and is compatible with all standard kingpins. Constructed from high-strength cast steel with a thickened, wear-resistant top plate and heat-treated locking jaws, the unit offers high load capacity, deformation resistance, impact toughness, and wear resistance. It is suitable for diverse and demanding operating conditions, including general cargo transport, "Green Channel" (fresh produce) logistics, long-haul trunk transport, heavy-duty construction site operations, and oversized cargo hauling.
It features a dual-safety locking mechanism that ensures a secure connection and prevents accidental detachment, while allowing for smooth steering and noise-free operation. Available in both fixed and adjustable configurations, the unit boasts a robust structure, low failure rate, and ease of maintenance; the wear plate and locking jaws can be replaced individually, significantly reducing maintenance costs.
Product Types
1. By kingpin diameter: 50# (2-inch) standard-duty and 90# (3.5-inch) heavy-duty models; these are designed for their respective kingpin sizes and are not interchangeable.
2. By structural design/manufacturing process: Reinforced cast models and standard stamped models; available in fixed and longitudinally adjustable versions (adjustable models are better suited for drop-and-hook operations).
3. Locking mechanism: Primarily manual mechanical locking; pneumatic locking models are also available.
Reference Specifications
| Compatible with kingpin | 50mm / 90mm |
| Panel thickness | 8mm (standard), 10mm (heavy-duty) |
| Main material | High-strength cast steel and wear-resistant manganese steel; the locking block is heat-treated for enhanced strength. |
| Implementation Standard | Manufacturing in accordance with the GB/T 20069 national standard for trailer fifth wheels. |
Key Features and Advantages
1. Reliable Locking Mechanism: Features a dual-safety locking design that prevents accidental detachment during operation, ensuring a high level of safety.
2. Durable, Impact-Resistant Turntable: Offers smooth performance during turns and reversing while minimizing noise and binding; suitable for complex operating conditions, including high-speed driving and rough gravel sites.
3. Comprehensive Range of Specifications: Available in standard-load, heavy-duty, and adjustable models to suit various transport requirements.
4. Easy Maintenance:Locking blocks and wear plates can be replaced individually, reducing maintenance costs.
We supply a comprehensive range of fifth wheels, sourced directly from the manufacturer and individually tested before leaving the factory. With ample stock available for bulk orders, we provide selection guidance and after-sales support, serving tractor-unit modification shops, auto parts distributors, and logistics fleets across various regions.
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