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Old 02-17-2010, 02:35 PM
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Grade 8 Bolts

Hi guys is there any bolts that are stronger than a grade 8? Thanks

Dave

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Old 02-17-2010, 03:00 PM
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Yes, lots of the Aerospace grade stuff is better than Grade 8. ARP has several lines of automotive fasteners better than Grade 8 - 8740 alloy, ARP 2000 alloy, and L19 come to mind.
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Old 02-17-2010, 03:14 PM
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What do you want to use them for?
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Old 02-17-2010, 04:00 PM
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The bolt on my rear brake assembly that holds the strut in place on my 2001 Sable snaped off when I was removing it. So I drilled it out and I am going to install a nut and bolt and I want the strongest I can get to put in there because of the weight. Do you have any suggestions? Thanks

Dave
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Old 02-17-2010, 04:13 PM
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For some good place to start on chassis fastener info, go to the CoastFab.com website and click on the tech info link. Grade 8 may not be the best for bolts that are in a shear load application - Coast Fab indicates that AN aircraft hardware is 'vastly superior' to Grade 8 bolt in a shear load. AN hardware is actually rated equivalent to Grade 5. Grade 8 is 150,000 psi tensile and 90,000 psi shear, Grade 5 is 125,000 tensile and 75,000 shear.

In any event, they have a load of info on all kinds of bolts nuts and washers and their application. They'll also send you their catalog which has all the tech stuff inside as well.
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Old 02-17-2010, 07:23 PM
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Just so you know, the best source of Grade 8 hardware of all kinds is in the parts department of your local Caterpillar dealer.
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