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Larry, I suggest that the only reason to use a Grade 8 bolt instead of a Grade 5 in a professional design is because one needs to tighten the bolt tight enough to gain greater clamp force. The double nuts are fine, but I would still make sure you tighten as much as the recommendation says. Also, to settle an argument once in our office (we designed industrial gearboxes) I called Loc Tite to see how they treated bolts with Loctite on them,i.e., were they dry or lubricated? (I had earlier been told that a lightly oiled bolt is considered “dry”). Loc Tite said a bolt with Loctite on it is considered lubricated and that was the torque value to use when torquing the bolt. Another danger of Gr 8 bolts is that whereas when you over tighten a Gr 5 bolt, if it doesn’t break immediately it will be ok, not so with Gr 8. It may break months from now. Mike Moore On Sep 21, 2015, at 2:42 PM, Larry Jett LarryWJett@xxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote: So as not to have a thread a mile long, here is my new thought. Today I purchased new grade 8 bolts, two per caliper, and castle nuts for each plus 1/8 inch cotter pins. I will drill the bolts 1/8 inch through, torque the nuts on full as I can after lubing with Lock-tight. AAJ either provided 1 3/4 inch grade 8 bolts or said they were required, and the nylon locknuts should have been sufficient provided the nuts were torqued sufficiently. In my son's case, insufficient torque or some-other reason caused trouble. There is room to use longer grade 8s and use two nuts and a lockwasher between them as a fail-proof scheme. Larry Jett: I live in my own little world; but that is OK as everybody knows me there!! __._,_.___ Posted by: Michael Moore <mmoore8425@xxxxxxx> To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to https://groups.yahoo.com/neo/groups/all/manage/edit For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang __,_._,___ |
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