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We have changed out many u-bolt applications on truck and trailers and have never found any u-bolt nuts that have backed off to become loose. You will never collapse the axle tube; the u-bolt threads or nut threads will strip before any other failure. We have put this to test in the past. Once torqued to specifications they establish and remain home. The majority of these applications are with grade 8 u-bolts or better and heat treated long nuts with a heat treated washer ( not a lock washer) under this nut that will not distort. On the dexter axles most original have a fine thread nut 1/2 inch that is held in place by a nut with a flange, no washer, and this flange is supposed to lock it in place. Most after market replacement nuts are of the long type, heat treated, and you must use a continuous washer (not a lock washer) under them to prevent damage to the plate.
Yes, these suspension systems are light duty even if they are 7000 lb ratings, that's why it is very important to maonitor all suspension parts each time prior to a long trip. Glad I don't have to do this with our trucks and other trailers!!
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