The Washers are sturdy, corrosion resistant and have excellent weather ability. High Strength Friction Grip Bolts (HSFG) bolts are high strength structural bolts which have been tightened such as to induce tension in the bolt shank. Due to the tension in the bolt, the interface between the plies (steel members in a joint) cannot move relative to each other because of the friction resistance. Our Washers are high strength fasteners which are used under externally threaded screws. These are alternatively supplied to the customers at affordable prices.