27-08-2019, 10:12 PM
My experience is that properly tightened fasteners don’t come loose. In the case of a propshaft joint there has to be sufficient clamping load that all of the drive torque is transmitted in face friction not by shearing the bolts. If it is, the joint won’t come loose. If it isn’t, the bending of the bolt ratchets the nut loose. Spring or star washers won’t stop it, a split pin might but then the bolt will fail in fatigue. In this case, the bolts are more than adequate for the job, the problem with propshaft bolts is that they are difficult to tighten, but if they are tight they work.
Alan Fairless