Room 1510, Block C, Wanda Plaza, Jingsi Road
Shizhong District, Jinan City, Shandong Province, China
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Product Description
Frequently referred to as the “pivot point between the tractor and semi-trailer,” the kingpin is the part used to connect a semi-tractor and a semi-trailer. A kingpin may resemble any of the above images but always shares a few key features:
A welded side. One side of the kingpin is always welded to the semi-trailer. This is why kingpins are often considered a “trailer solution” rather than a “truck solution.” They are always fixed to the trailer and then coupled with the tractor using a fifth wheel coupling device.
A tapered section. Every kingpin has a tapered section that is narrower in width than the sections above and below it. This is where the fifth wheel locks around the kingpin to provide a secure coupling. By making the areas above and below the tapered area wider, manufacturers ensure another layer of protection, minimizing the potential that a kingpin could slip out of a fifth wheel’s coupling mechanism.
Parameters
| Model | Specification | Kingpin | Skid plate thickness(A) |
| XINGHAO -50#/8 | 50mm(2") | 108KN | 8mm |
| XINGHAO-50#/10 | 50mm(2") | 108KN | 10mm |
| XINGHAO-50#/12 | 50mm(2") | 108KN | 12mm |
| XINGHAO-90#/10 | 90mm(3.5") | 240KN | 10mm |
| XINGHAO-90#/10 | 90mm(3.5") | 240KN | 12mm |
| XINGHAO-90#/16 | 90mm(3.5") | 240KN | 16mm |
Applications
The function of king pin is to engage the semi-trailer to the fifth wheel. The king pin is the most critical component used in the load tranfer from semi-trailer.
The coupling consists of a kingpin, a 2-or-3+1⁄2-inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a fifth wheel on the rear of the towing vehicle. As the connected truck turns, the downward-facing surface of the semi-trailer (with the kingpin at the center) rotates against the upward-facing surface of the fixed fifth wheel, which does not rotate.
Kingpin adaptor to couple a 2" kingpin on a 3½" fifth wheel
• Ideal for shunting of different semi-trailer tractors
• The D-value of the 2" kingpin remains unchanged
• Important:
The adaptor is suitable for temporary use on private sites only, e.g. on non public park grounds or for short tow runs.
