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  1. Double Up Unistrut/Superstrut

    Building & Construction
    I'm using Unistrut/Superstrut and need to double up. I plan on joining the backs to create the rails on both sides. What is the best bolt size to join the two together? Should I use the 1/2 or 3/8 bolts? Do I use regular washers or the special square ones? How long should they be?