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Steel Washer 3/8"

It is actually better to use 5/16" washers for 3/8" bolts and threaded rod.

5/16 in. Zinc Plated Cut Washer (100-Pieces) 

Steel Washer Zinc Plated 3/8in 

http://www.homedepot.com/p/Crown-Bolt-5-16-in-Zinc-Plated-Cut-Washer-100-Pieces-46050/203639702         $9.95 for 100    (10 cents each)