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 Who has actually seen a SAE Grade 5.2 bolt? |
 Dec 6 2005, 11:46 PM
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Veteran Member  Group: Advanced Members Posts: 2,640 Joined: 25-December 03 From: Louisville, KY Member No.: 40  |
So a certain student's machine design professor has pushed the idea into people's heads that we should use SAE Grade 5.2 or greater for all thing structural or important. Good luck finding those bolts, I knew they existed, but have never seen any. His logic is that the yield strength of a grade 5 bolt changes when you get over a certain diameter (1" IIRC) whereas the 5.2 grade's yield strength is constant. We also had a machine design project where we had to specify a size and preload for a grade 7 bolt. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/rolleyes.gif) Also according to him, nobody makes bolts with cut threads any more. Aren't most cheap chinese bolts manufactured with cut threads?
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Dec 7 2005, 12:37 AM
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Experienced Member Group: Advanced Members Posts: 1,197 Joined: 13-February 04 From: Hudson, Colorado Member No.: 197 |
I don't think I know wht the markings look like, so i have no idea if I've ever seen one. Grade 5 usually has 3 "tick" marks on top and grade 8 has six. The metric ones usually say the grade number on the head. What does a 5.2 look like? A grade 7?
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robz71lm7 Who has actually seen a SAE Grade 5.2 bolt? Dec 6 2005, 11:46 PM
robz71lm7 http://www.americanfastener.com/technical/...kings... Dec 7 2005, 12:40 AM 35th_Anniversary_AS_Camaro_SS For our machines we always use rolled threads (not... Dec 7 2005, 01:57 AM nape Yuck.
I'm a guy who never made it past the ... Dec 7 2005, 05:01 AM pknowles QUOTE Aren't most cheap chinese bolts manufact... Dec 7 2005, 01:39 PM firehawkclone QUOTE (robz71lm7 @ Dec 6 2005, 17:46)So a cer... Dec 7 2005, 02:59 PM 00 SS I've seen one of those. A bolt with infinate ... Dec 7 2005, 03:08 PM severous01 i'v seen the 3 tick bolts. i had to replace t... Dec 8 2005, 03:12 PM
pknowles QUOTE about the rolled threads...i have no clue. n... Dec 8 2005, 03:19 PM |
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