Trailer U Bolt

A trailer U-bolt is a curved fastener manufactured to precise specifications, engineered to clamp the leaf spring pack to the trailer axle and maintain suspension alignment under dynamic loads. These components are typically crafted from high-strength steel—available in raw, zinc-plated, hot-dip galvanized, or stainless finishes—to resist corrosion and maintain clamping force in environments ranging from road salt to freshwater exposure. The critical dimensions—thread diameter, inside width, and leg length—must match the axle tube size, spring width, and mount plate thickness.

Proper installation involves using torque-specified nuts, lock washers or plates, and periodic re-torque checks, as steel U-bolts stretch during initial installation or under heavy load, which may loosen the clamp over time.