Sorry, it's in the back of the parts catalog, under hardware listing...gives size, head type, material, and finish. Like mentioned above it is a 1/4-20 x 1 3/4 socket hd allen, scotch grip, bright zinc,...simply a cap screw, 1/4" diameter, thread pitch 20 x 1-3/4" long...scotch grip is thread locker like Loctite, usaully blue for medium hold.