Yantuo 8" Swivel-Top Bunk Bracket Kit, 4-Pack Galvanized U-Bolts & Adjustable Slotted Plates

Yantuo 4 PCS 8" Galvanized Swivel Top Bunk Bracket Kit secures and angles your trailer bunk boards with corrosion-resistant swivel-top mounts and all needed hardware.

Whether you haul a powerboat, bass boat, or runabout, the right bunk hardware makes loading, support, and storage easier. This Yantuo kit includes four swivel-top brackets, slotted bunk plates, U-bolts, and zinc-plated fasteners designed to attach to common 3" crossmembers and allow the bunk tops to pivot and match hull contours.

How does the swivel-top feature improve boat support?

The swivel-top design lets each bunk pivot independently so the bunk surface aligns with the boat hull instead of forcing the hull to conform to a fixed angle. That reduces pressure points and helps the boat seat more evenly across the bunk surface.

• Independent swivel on each bracket for hull-conforming contact
• Concave seat design to resist unwanted rotation
• Slotted bunk plate for small angle and height tweaks

Will these brackets fit my trailer crossmember?

This kit is built to accommodate common square and C-channel crossmembers used on many small- to mid-size trailers. The included U-bolts have extended threads and a 3" width to clamp around 3" wide beams up to various heights.

• U-bolt size: 1/2" diameter, 3" wide, 4.5" long
• Extended 3.1" thread to fit 3" x 1.5", 3" x 2", and 3" x 3" crossmembers
• Works on square tubes and C-channel crossmembers mounted fore and aft

How simple is the installation process?

Installation is straightforward for anyone comfortable with basic trailer maintenance. The square U-bolts wrap around the crossmember, the hardware secures the bracket, and the slotted bunk support lets you dial in height and angle quickly.

• Mounts using included galvanized U-bolts, washers, and nuts
• Slotted bunk plates allow height adjustments without drilling new holes
• No special tools beyond wrenches and a torque method to tighten nuts

What materials and corrosion protection are used?

The Yantuo bunk bracket kit uses heavy-gauge metal components with a galvanized finish for resistance to rust in both freshwater and saltwater environments. Zinc-plated bolts add an extra layer of protection for fasteners exposed to spray and splash.

• Galvanized brackets and U-bolts for durable outdoor use
• Zinc-plated fasteners to reduce corrosion of threaded parts
• Rigid metal construction resists bending and deformation under load

Who is this kit for? If you own a small to medium boat trailer and need a reliable, adjustable bunk mounting solution, this Yantuo 4-pack is a practical choice. It's especially useful for DIYers, boat owners who trail frequently, and anyone replacing worn or fixed-angle bunk mounts who wants improved hull contact and easier loading. The included hardware covers most common 3" crossmembers so you can refit bunk boards quickly and get back on the water with better support and longer-lasting components.