A325 Bolts used without washers 1

[sundancekid]

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?

 

[WillisV]

See Section 6 of the RCSC Specification on Bolts (can be found free here:

http://www.boltcouncil.org/files/2004RCSCSpecification.pdf

)

Per Section 6.1, washers are not required for snug-tightened bolts in standard holes.