90# Welded Type Kingpin ​

We manufacture our 90# Welded Type Kingpin to provide a permanent, high-integrity connection between heavy-duty semi-trailers and fifth-wheel couplings. Engineered for extreme payloads and tough road conditions, this 3.5-inch welded traction pin transfers heavy pulling force and vertical loads directly into the trailer skid plate. By eliminating bolt-on hardware, our welded design prevents loosening caused by persistent road vibration, making it a dependable choice for logging, mining, and long-haul freight operations.

 Full-Penetration Weld Geometry for Maximum Joint Strength

We machine a precise bevel edge into the mounting collar of the 90# Welded Type Kingpin. This structural preparation allows full-penetration welding directly onto the trailer bolster plate, creating a monolithic connection that resists severe twisting moments and sudden braking shocks.

 Heavy-Duty Structural Capacity for High D-Value Demands

With a certified 240 kN D-Value rating, this kingpin readily handles intense longitudinal forces. We optimize the neck profile to reduce stress concentration, ensuring your heavy equipment lowboys and tipper trailers operate safely under peak payload limits.

We forge every 90# Welded Type Kingpin from premium-grade alloy steel, CNC-machine the shank to strict tolerances, and apply targeted induction hardening to maximize wear resistance. Each unit undergoes rigorous magnetic particle inspection to guarantee zero flaws before shipping.

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