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i built an exo cage for the front portion of my 4runner and an interior cage for the rear. i am planning to bolt the cages together, sandwiching the can back between them with 3/8'' plate. grade 8 to sheer/shatter or grade 5 to bend/stretch when the cage gets 'used'??
 

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The grade 5 will yield and fail long before the grade 8 even begins to get into trouble. There is a line between the two scenerios where in a roll the grade 5 mounting points will completely shear, while the grade 8's will hold without hardly any deflection. That's the situation you need to look at.
 

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Grade 8. You don't want the connection point to ever yield. You want the cage material to absorb the impact. Don't compromise at the joint.
 

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Grade 9 I believe? High tensile strength like grade 8 but will bend/stretch a bit before breaking/failing.
Grade 8 is what I'd go with, seem plenty strong if you are using the proper size fastener for the job. IF it breaks you aren't using the right or enough fasteners. Not an engineer, just the way I see it.
 
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