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Maximum Amount of Wear 5th Wheel Trailer King Pin Before Replacement

Question:

What is the diameter where on a king pin before its time to replace it

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Expert Reply:

Typically the max wear on a king pin is .080 of an inch with a minimum diameter of 1.920. DOT says the max wear is .125 of an inch with a minimum diameter of 1.875. When new the king pin will have 2 inches of diameter. See the image I made for you showing the dimensions of a weld on king pin.

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