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02-12-2011, 05:12 AM
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#1 |
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Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Rear bumper bolts.
Looking for opinions on Grade 8 VS Grade 5. I have no idea what grade would be used on stock bumper bolts.
I bought Grade 8 cause there plenty strong, then i got to thinking, in a rear impact is it possible the tinsile strength of Grade 8 bolt could possibly fracture and shear where a grade 5 would bend? I know shear bolts are a low grade 2 or lower. My bumper will have 4 1/2 National fine grade 8's with the shank long enough that no threads will be in the frame and bumper plates.
__________________
Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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02-13-2011, 01:07 PM
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#2 |
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Happy Camper
Join Date: Feb 2006
Location: Northern California
Posts: 8,407
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Re: Rear bumper bolts.
Hmmm good question, I would have done the bigger is always better thing, but that is a good point... anyone?
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RIP El Jay! Love you brother! |
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02-13-2011, 05:21 PM
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#3 |
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Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: Rear bumper bolts.
My current rear bumper is well over 100 lbs made from chanel iron and diamond plate.
Guess i just want to know what grade would be used from factory but will continue with the grade 8's
__________________
Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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02-13-2011, 07:41 PM
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#4 | |
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Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: Rear bumper bolts.
Quote:
__________________
Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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