Fin neck bolts are threaded full length to the base of the fins hole size should be 1/8” larger than bolt size to allow fins to lock into structural material and seat properly. adjustments to hole size may have to be made on site to accommodate hardness of materials being fastened
A square washer can be made of stainless steel, brass, steel, or other material, and may have a zinc finish or electro-galvanized plating for environmental protection. square washers come in various dimensions and have inner and outside diameters designed to fit with specific sizes of bolts or screws.
Standard size hexagon bolts, m12 hexagon head bolts, rawl shoulder bolt m9 m13 high strength bolts with hole us $0.01$1.00 / piece
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