King Pins: Kingpin Sets, Truck King Pins, and Heavy Duty Replacement Parts

A kingpin is the vertical pivot that lets a solid front axle steer, the same role a ball joint plays in independent suspension, but built for heavier, sustained loads. Kingpins see constant stress on trucks, lorries, a nd semi-trailers, and wear shows up as steering play worsening with every kilometre rather than a sudden fault.

At CBT Auto Parts, we stock king pins and king pin set kits for trucks, semi,s and trailers, including Holland and Dana 60 fitments, part of our Suspension & Steering Parts range alongside Ball Joints and Steering Knuckles. Aftermarket is accepted, every kit is matched for fitment, and fast shipping keeps your fleet moving.

King Pin

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FAQs

1. Is a kingpin the same thing as a ball joint?

They perform a similar function but are different parts. Kingpins are used on solid front axles with a pressed pin and bushing design. Ball joints are used on independent suspension.

2. Why are kingpins sold as a set rather than individually?

The pin, bushings, and thrust bearing wear on a similar timeline. Replacing only the pin while leaving worn bushings in place reintroduces play almost immediately.

3. Is a semi-trailer kingpin the same part as a truck kingpin?

No. A truck kingpin is a steering pivot. A semi-trailer kingpin is the coupling pin that locks into the fifth wheel. They share a name but serve entirely different purposes.

4. Can I replace kingpins myself without a workshop?

It is not generally recommended. The job requires a hydraulic press and specific axle support tooling, and incorrect installation reintroduces play almost immediately.

5. How urgent is the kingpin replacement once wear is confirmed?

It should be treated as a near-term priority rather than scheduled maintenance, since wear accelerates quickly under sustained heavy axle load once it begins.