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washers

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what are the requirements for installing washers on bolted steel to steel 
connections?  I have always understood washers to be a standard part of a 
connection, but have a contractor who wants to charge an extra.  Is it 
required on only high strength bolts and therefore installed without having 
to specify?  Are they required on A307 bolted connection and base plate 
connections if standard holes are used?   What code section specifies washer 
requirements.

thanks paul franceschi