The thing that gets my attention here is that the carriage bolt is marked 307, which is an ASTM designation and I believe the equivalent of grade 5, regardless, the manufacturer has marked these as such and they should meet the criteria for same, obviously not the case in tension here is it ? Could be the same for shear, appears to be defective or substandard material. This creates an unsafe connection, one that may fail and cause someone injury. I do not believe a grade 5 fastener should fail like it did, unless it was over torqued. In comparison, structural steel connections are made with A325 fasteners, high strength bolts, which I believe are the equivalent to grade 8, regardless, they are marked as such, you cannot have substandard materials for these kinds of connections, it would be catastrophic. Funny, while on high rise jobs I used to pick up a lot of those A325's and put em in my bin at home, same ones fit and hold my tractor wheels on, ironworkers used to drop buckets of em on jobs, never stop to pick em up, I used to find a lot of useful hardware on jobsites such as these.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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