I agree


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Posted by David Sherman on Friday, November 02, 2007 at 23:40:30 :

In Reply to: Re: frame rivets posted by Kaegi on Friday, November 02, 2007 at 20:22:43 :

The beauty of rivets is that they completely fill the hole, prevent all motion, and when they cool they draw the parts tightly together. A lot of guys seem to think that the key to bolting frame parts together is to use grade 8 bolts. That's not it. The strength of the bolts or rivets isn't the key thing, since the rivets are annealed by being installed so they're probably no stronger than a grade 2 bolt in terms of ultimate PSI. In structural steelwork, at least when they first started using bolts instead of rivets, they required that holes be bored undersized in the steel shop, aligned and clamped together in the field, and then reamed to a close fit on finished steel bolts. This was to prevent any slop that could let the joint start "working". If you've ever seen what happens to anything bolted to a vehicle frame (usually aftermarket accessories, bumpers, hitches, etc) when the bolts get loose, it's amazing how fast all the holes get oval and the bolts all get bunged up. If using bolts, they should always be SAE (fine) thread, like on all the M-series trucks. Fine threads are much less likely to come loose with vibration. A lockwasher is no substitute for a fine-thread bolt and a locknut, and even a cotter pin in a castellated nut is useless for fame applications because even if it just backs off the fraction of a turn that the cotter pin allows, that's enough to let the joint start moving.



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