Trailer axle U-bolts are among the trailer parts that fail and break most frequently, so it might not be a bad idea to keep some of these Uriah Products round U-bolts on hand. Doing so allows you to monitor your existing U-bolts and replace them at the first sign of significant wear and tear, which can save you the hassle of having a bolt break when you're on the road. This model is 7" long and can accommodate 3" trailer axles. | Uriah Round U-Bolt and Nut | Size 7" x 3"