4x4 Post Base Brackets, Powder-Coated Steel, 20 Pack

4x4 post base brackets lock wood posts in place for safer, steadier deck, porch, and railing builds. This 20-pack set fits standard 4"x4" posts (actual 3.5" x 3.5") with a 3.6" x 3.6" inner opening, helping reduce wobble while keeping installation straightforward. Heavy-duty carbon steel with a powder-coated finish supports long-term outdoor use on concrete or wood surfaces.

• Fits standard 4"x4" wood posts (3.5" x 3.5" actual) with 3.6" x 3.6" inner dimensions for a secure seat


• Delivers stable, wobble-resistant support for handrails, porch posts, pergolas, columns, and deck structures


• Resists rust with powder-coated carbon steel and 1.6 mm (0.06") wall thickness for outdoor durability


• Includes expansion plugs and self-tapping screws to streamline mounting on concrete or wood


• Speeds installation with pre-drilled screw holes; align, drill, fasten, and set posts quickly

Build with confidence using a post anchor set sized for common lumber and designed for dependable structural support. Whether you’re securing deck posts, porch railings, or a pergola frame, these steel post brackets help keep your layout aligned and your posts firmly seated. With a 20-piece quantity plus installation hardware, you can tackle multi-post projects without piecemeal sourcing. Grab yours today and get your next build ready for a clean, professional install.

• Quantity: 20 pcs


• Per-piece size: 6 x 6 x 2.4 in (153 x 153 x 62 mm)


• Inner opening: 3.6 x 3.6 in (91 x 91 mm)


• Material: Carbon steel


• Steel thickness: 0.06 in (1.6 mm)


• Finish: Powder-coated


• Kit hardware: Yellow expansion plugs M5*35 (90 pcs); black self-tapping screws M5*35 (260 pcs)


• Net weight (set): 18.1 lb (8.2 kg)