beveled washer or no

huangyhg

beveled washer or not?
when must you use a beveled washer?  is an angle spec'ed out that is allowable between bolt head and bottom of surface.  please see attachment.
what does a 40lbs piece of plate, 2'x10', have to do with a washer ?  
wrong attachment, sorry.  try this one
aisc steel construction manual 13th edition.  page 16.2-40
6.1.1 when the outer face of the joint has a slope greater than 1:20...
the best way to test something is to squeeze it, slowly, until it breaks!