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allen bolts

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I’m working on a residential steel stair with channel stringers and bolted connections at floor levels and landings.  The architect wants to use allen bolts – the type with a beveled head (like a bugle screw) that flushes with the surface when tightened.  Does anyone know of a source for design information on this type of bolt?  Seems to me that it’s not your typical bolt bearing condition.

TIA

 

Dan Morrow, P.E.