This 5.2K-7K trailer axle spring seat is a quality part. Designed for 5.2K, 6K, and 7K trailer axles with 3" Tube; Quick and easy to install; Made of durable and resistant material; When working on your commercial trailers, its important to know which parts you need and how to install them. This 5.2K-7K trailer axle spring seat is a quality part, and it can be a great choice for your new Dexter axle. The spring seat is an anchor for your leaf spring, and without it, your trailer suspension wont be complete. At The Trailer Parts Outlet, we want to make sure that you can find all the parts you need at prices that fit your budget. Order your new 7K spring seat today. Two 5.2K-7K spring saddle perch.