m870a1 kingpin

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powersmoke18

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looking for the 2" king pin that fits an M870a1. any one know where i could get one or have a part number? thanks guys! Bart G.
 

Castle Bravo

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looking for the 2" king pin that fits an M870a1. any one know where i could get one or have a part number? thanks guys! Bart G.
There is no part number, because there is no 2" M870A1 kingpin. That is, to say, there is no stock/OEM 2" kingpin. The trailer was designed for the 3-1/2" fifth wheel tractors. To my knowledge, all of the A1s were manufactured by Shoals American Industries, which no longer exists, so you can't go to them for parts.. I think armed with the correct dimensions and starting with an existing 2" kingpin, you could make (or have made) a working 2" kingpin assembly for the M870A1.

I have a 2" kingpin for my 870A1, but it was manufactured by someone. I could probably get you some dimensions of the kingpin that I have.
 

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simp5782

My safe word is Pork and Beans.
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Will bump this with some information.

Replacement kingpins for the 870 and 870A1 are as follows

For 3.5in and 2in
Overall length : 8.5"
Barrel thickness 4.5


3.5in kingpin Load king part# MP5-1639-1.
2.5in kingpin Load King part # MP5-1638

Spec diagram attached of both
 

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zebedee

conceptualizer at large
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I saw there were 5 that came through Wed at the
Albany GA auction
and 4 of them had no king pin. I would have jumped in if they were a lot closer to me and could have gotten dims to make one. Perhaps this is a sign of something to come - we can hope. Pre production of these may be prudent - anyone know if they are a higher grade steel?
 

simp5782

My safe word is Pork and Beans.
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Kingpins are made of either 4320 or 8620 so hard enough

I am having a flip pin made. 4.5in diameter 8620 came in 2ft stock lengths. Going to have it as a 3.5in pin on one side and a 2in on the other with a raised weld in the middle as the hole catch for the pin. So you can simply use 1 pin for everything


3.5in pin is available from loadking for $460
2in pin is $650
 

simp5782

My safe word is Pork and Beans.
Supporting Vendor
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Memphis, TN
Total length of the pin needs to be 9-9/16" longer than the spec sheets provided. Attached are specs for the 3.5in pin from Castle Bravo.
 

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