The 3/8-16 x 3 1/2 Grade 8 Hex Flange Screw (Frame Bolt) Black Phosphate & Oil, Pack of 4 is a premium-grade fastener built for strength, durability, and secure fastening. Made from Grade 8 steel, it is designed to withstand high torque and heavy loads in demanding applications. The integrated flange provides an even distribution of pressure, eliminating the need for washers while reducing the risk of loosening. With a corrosion-resistant finish, this hex flange screw is ideal for automotive frames, machinery, and construction projects. Experience enhanced performance and reliability with this high-strength frame bolt.