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A325 Bolts used without washers

A325 Bolts used without washers

A325 Bolts used without washers

(OP)
While visiting a large jobsite the other day, I noticed that they were assembling massive galvanized truss units (200+ feet) with A325 bolts and no washers on either side.  The holes are matched plates with round holes (not slotted).  I have normally understood that a washer should be used on the “turn” side.  Is this practice of using no washers standard or some special condition?  

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