Trailer Axle Tie Plate and Tie Plate Kits are used to mount a square or round axle to the trailer's leaf springs. U-bolts, tie plates, nuts, and washers are included in tie plate kits. Browse the large selection of top quality siraweb.com tie plates tie plate kit from top brands such as Dexter. CE Smith and Reliable Trailer Products. Low prices, fast shipping and no hassle returns, order today!