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I'm not trying to be a know it all but some back ground .While it's true I am a union journeyman electrician with about 50 years experience that was only part of my job .Another part was programing CNC type automatic machines that installed screw type fasteners .A threaded fasteners acts like a...

Well for that matter they have a 10.9 class also but that just confuses things to even mention them .While one source might give grade 8's to 150,000 PSI tensile another might give them 186,000 which exceeds metric 12.9 .The info is as confusing as rated HP ratings alleged by engine...

Grade 12 is a metric usage measurement which is about like SAE grade 8 .Just wanted to interject that a properly torqued fastener will not loosen up .On something like a chipper the use of anti seize compounds is very necessary if you ever want to take it apart again .Any good bolt supply...