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 - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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