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Truck Trailer Accessories Casting Fifth Wheel 2 Inch 3.5 Inch

The Fifth Wheel Coupler is a large horseshoe-shaped coupling mechanism mounted in the bed of a tractor truck, designed to connect and secure the front axle (kingpin) of a semi-trailer. It serves as the primary load-bearing interface between the tractor and trailer, enabling safe towing of heavy freight over long distances.

Widely used in commercial trucking, logistics, construction, and transportation industries, fifth wheels are built from high-strength steel and engineered to withstand extreme dynamic loads, vibrations, and harsh operating environments. They allow for smooth articulation during turns while maintaining stability and control.

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Product Description

Attribute	Description
Part Name	Fifth Wheel Coupler / Fifth Wheel Hitch
Type	Fixed, Sliding (manual or air-operated), Double Pivot, Low-Profile
Application	Class 8 Trucks, Tractor Units, Long-Haul Freight, Dump Trucks, Tankers
Trailer Compatibility	Standard 2” or 3.5” Kingpin (ISO 337, SAE J700)
Material	Heat-Treated Alloy Steel (e.g., ASTM A572, Grade 50)
Top Plate Design	Horseshoe Shape with Locking Jaws, Grease-Slotted Surface
Load Capacity (Vertical)	40,000 lbs – 60,000 lbs (18,144 kg – 27,216 kg) typical
Gross Combination Weight (GCW)	Up to 80,000 lbs (36,287 kg) depending on setup
Mounting Style	Frame-Rail Mounted (via brackets and bolts)
Lubrication Requirement	Regular application of NLGI #2 grease on wear plates and pivot points
Locking Mechanism	Manual or Air-Actuated Jaw Lock; Visual/Open-Closed Indicator
Safety Features	Secondary safety latch, kingpin capture sensor (on advanced models)
Standards Compliant	SAE J700, ISO 337, FMVSS 121, DOT Certified