All you want to know about bolts...Grade 5 or 8 or aircraft or whatever....

[jerryweichers]

ok if i read one of the last posts correctly ''coarse threads facillitate repeated removal and installation . and that's important to what? saving money? if you go to any magor aircraft manufacturer and watch how they assemble aircraft you will find that their assemblers are under strict orders that if they drop a fastener they are to leave it and get a new one. at the end of the day these companies 'sweep '' their floors and sell the stuff as surplus. they even lable it as ''sweeps'' in one of the previous posts on this forum a fellow who is far more qualified than me referred to a grade 8 bolt failure as a result of an inclusion , what is the defition af an inclusion? in simple terms it means flaw. when you buy a diomand it is graded among other things based on the amount of inclusions visable to one with training at 10 times magnification. so the bolt failed as a result of a flaw . so blame the bolt or the manufacturer? another poster on this forum claims thay it is legal to install grade 5 hardware in an airplane . all i can say is if he can show me a legal installed fastener in an aircraft of 3/8s diameter or above installed in a critical application i will gladly fly out and kiss his you know what!