Quote:
Originally Posted by MStudt
It all depends on your load placement. Extruded aluminum has a different deflection rate depending on load placement, and length of the piece. I don't know this for a fact, but I assume they're using a 1" x 2" extrusion. Or commonly known as 10-20 extrusion. Most manufactures of this material are using 6105-T5 aluminum alloy.
This material is plenty strong for roof rack applications. If you're concerned about it you can download a deflection calculator to figure out the fracture point.
Mike
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This nailed it as far as crossbars go. Thanks!
Quote:
Originally Posted by jross20
Okay, I just worry as I know aluminum has no "endurance limit" or whatever it is called. Perhaps this is isn't as bad with alloys?
What alloy do you use by the way? If you can say.
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We use 6061 Aluminum on our side plates and fairing which is a really strong and rigid aluminum, keeps deflection to a minimum which is especially nice for shipping when everything is not bolted up. We also use 1/4" vs most other companies which use 3/16" and often times 5052 aluminum which is not near as rigid when used as a side plate.
Our feet are all 5052 as it takes to bends much better and in 1/4" its overkill which is how we like it.
The limiting factor on all of our racks are simply the vehicle itself, the roofs, nut inserts etc will all fail before the rack components under heavy stress.
Hope this answers your question.
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