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RE: Washers for A325 Bolts

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Title: RE: Washers for A325 Bolts

>AISC recommends ASTM F436 flat washers for
>A325 Bolts. Assuming the bolts are
>tightened by the turn-of-the-nut method,
>is there any advantage (or
>disadvantage) of providing lock
>washer after the flat washer?

Lock washers will compress long before the pretension is achieved. So they will serve no purpose in a pretensioned bolted joint with A325 (or A490) bolts other than adding their cost.