4x4 Post Base Brackets, 4-Pack, Carbon Steel, Black

4x4 post base brackets lock wood posts in place for steadier deck, pergola, and railing builds. This 4-pack features a fully enclosed sleeve sized for nominal 4x4 posts to reduce wobble, with a wide base plate for confident anchoring to wood or concrete. Heavy-duty carbon steel with a black powder-coated finish helps resist corrosion outdoors, while the included dual-purpose hardware kit speeds up installation for pavilions, porch railings, and column supports.

• Fits nominal 4x4 posts (recommended 3.5 x 3.5 in) with a 3.6 x 3.6 in inner sleeve for a secure, low-wobble hold


• Delivers stable anchoring with a 5.5 x 5.5 in base cross-section and fully enclosed post support design


• Resists rust with 2 mm carbon steel and a black powder-coated finish built for outdoor decking and pergolas


• Includes dual-purpose fasteners for wood or concrete mounting, plus washers and a double-ended wrench


• Simplifies setup with pre-drilled screw holes—drill, align, and fasten for clean, repeatable installs

Use these post brackets when you want a cleaner finish and more dependable support than surface-only mounts. The enclosed post sleeve helps keep posts aligned for straighter rails and sturdier pavilion or porch builds. With hardware for either wooden floors or concrete pads, you can standardize installs across different areas of a project without hunting for extra fasteners. Stock up before your next framing day and grab yours today to keep your posts secure from the first screw.

• Quantity: 4 pcs


• Inner dimensions: 3.6 x 3.6 in / 92 x 92 mm


• External dimensions: 3.78 x 3.78 in / 96 x 96 mm


• Base cross-section: 5.5 x 5.5 in / 140 x 140 mm


• Wall thickness: 2 mm (0.08 in)


• Material: Carbon steel


• Finish: Black powder-coated


• Product dimensions (each): 5.51 x 5.51 x 5.51 in / 140 x 140 x 140 mm


• Net weight (set): 11 lbs / 5.0 kg


• Included hardware: M8×60 self-tapping screws, φ12×60 expansion screws, M8 washers, M5×25 wood screws, 8–13 double-ended wrench