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STEEL: Min. Required Thickness for Anchor Rod Plate Washers

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I emailed a similar technical question to AISC’s help desk, and I got some good information.  It said that a general rule for base plates that weren’t unusually loaded, plate washer thickness should be the following for different grades of bolts. 


36 ksi = 1/3*bolt diameter

55 ksi = 0.4*bolt diameter

105 ksi = 0.7*bolt diameter


And, of course, if you had special or high shears, you should always design for the specific forces.


Hope this helps,



Andy Heigley, PE


Jezerinac Geers & Associates


Dublin, OHIO