Bolt head markings-what do the letters and symbols mean? | FAQ

[@morid3938]

So which company sells spf bolt? 10.6

[@macbethdemilo7253]

My stainless steel hex bolt has F593C JBK THE on the head, what grade is it?

[@DevINCProd]

Top center- S Bottom left- EN Bottom right- 07 What does this mean? Please help. It has a breakaway head when its torqued