4/29/2023 0 Comments Pinbox ltd![]() I was out on my exercise walk this morning and taking particular notice of the 5th wheel hitches. It seems to me my Sacramento RV repair guy said that he found broken welds. I thought the frame work was welded together like all of the other framework stuff. I was thinking of running this problem past my aerospace engineer son, too. Thanks for the pictures offer and the technical discussion on the metalworking. There is also a king pin hitch out there that has the airbags, four, in the base, but I really like the Flexair Trail Air kingpin. It nice to see all the pounding from the fantastic roads, lol, not being transferred to the fasteners in the fifth wheel.įix and keep, or new fifth wheel, I would not use a kingpin that doesn't remove the shear/shock off the fasteners. So I added the Trailair Flex Air king pin. After I had mine repaired, I wanted to reduce the shock/shear forces on the fasteners. My shop doubled up on the fasteners as well. So I asked that larger and longer and more hardware be used. So how much confidence do you have on consumer hardware not having embrittlement problems? If one fastener fails, the load has to be added to the remaining fasteners. ![]() The metal came from a foundry in China and so did the certs. An analysis under an electron microscope showed a contaminate in the fastener was the cause of the embrittlement and failure. We had unexpected failures in shear using bolts. Without the shear pins or sleeves, the amount of fastener hardware is increased enable the fasteners to take the shear loads. I have seen bolts used for shear in Mil as well as NASSA programs as well as shear pins and harden shear sleeves. And if you look at the construct of them, they really cannot. All fifth wheel manufactures appear to not do this. Mechanical engineering for shear, a harden set of pins or sleeves around bolts should be used for shear forces not screws or bolts. The frames are held together with self drilling/tapping screws.
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