The Seachoice Galvanized Square U-Bolt (1/2-13 x 3-1/16 x 4-5/16) is a rugged, heavy-duty fastener engineered to withstand the harshest marine and road conditions. Forged from solid, hot-dipped galvanized steel, this square-bend u-bolt offers superior rust and corrosion resistance, making it the perfect choice for securing trailer axles, suspension springs, bunk brackets, and other critical frame hardware. Designed for a precise, secure fit around square tubing, the 1/2" diameter bolt features clean, high-torque threads and comes complete with matching nuts and lock washers to guarantee a tight, vibration-resistant installation that keeps your boat trailer safe and secure on the road.