Overview

The Ningbo Dimon Heavy-Duty 4x4 Post Base Bracket Kit is an innovative two-piece structural anchor engineered for effortless new construction and retrofit installations on decks, pergolas, porches, gazebos, and outdoor handrails. Featuring an ingenious two-piece interlocking half-wrap design, this post base fits snugly around standard nominal 4x4 lumber (actual 3.5" x 3.5") and installs directly onto existing, in-place wooden posts without requiring you to disassemble overhead rafters, jack up beams, or lift existing posts. Fabricated from heavy-duty structural carbon steel with a durable outdoor black powder-coated finish, it provides exceptional lateral stability, uplifting resistance, and post-bottom rot protection.

Key Features

• Two-Piece Split Retrofit Design: Clamps directly around existing posts from both sides, enabling fast, hassle-free reinforcement and repair without needing to jack up or detach standing pergolas, deck railings, or porch structures.
• Fits Standard 4x4 Lumber: Specifically engineered to fit standard nominal 4" x 4" wooden posts (actual 3.5" x 3.5" / 89 mm x 89 mm cross-section).
• Heavy-Gauge Solid Steel Construction: Stamped and formed from high-strength structural carbon steel with precision pre-drilled holes for maximum load-bearing rigidity and shear resistance.
• Weatherproof Anti-Corrosion Finish: Coated with an industrial-grade electrostatic black powder finish that withstands extreme weather, UV exposure, rain, snow, and outdoor humidity.
• Versatile Substrate Anchoring: Bottom flange mounting holes allow secure anchoring into concrete slabs, masonry patios, or timber deck framing using appropriate concrete expansion bolts or heavy-duty lag screws.
• Post Base Protection: Elevates post fastening points to prevent water pooling at the wood base, reducing premature rot, fungal decay, and insect damage.

Technical Specifications

• Material: Heavy-Duty Structural Carbon Steel
• Construction: Two-Piece Interlocking Half-Wrap Split Design
• Inner Dimensions: Fits standard 3.5" x 3.5" (89 mm x 89 mm) nominal 4x4 wooden posts
• Finish: High-Durability Outdoor Matte Black Powder Coat
• Hole Pattern: Pre-drilled side screw holes for wood post fastening & bottom flange holes for ground anchoring
• Applications: Deck railing posts, pergola supports, gazebo columns, porch uprights, fence post anchors, and mailbox supports
• Hardware Compatibility: Compatible with standard 1/4" or 5/16" wood lag screws and concrete wedge/sleeve anchors

Wholesale & OEM Capabilities

• Custom Sizes: Available for 4x4 (3.5" x 3.5"), 6x6 (5.5" x 5.5"), and custom timber dimensions per engineering drawings.
• Surface Finishes: Standard matte black powder coat, hot-dip galvanized (HDG) for marine/coastal exposure, or custom architectural RAL powder colors.
• Flexible Kitting & Packaging: Available in bulk contractor cartons or retail-ready 4-pack / 8-pack kits with mounting screws, expansion anchors, and custom barcode labeling.
• Factory-Direct Manufacturing: High-precision stamping production, consistent batch quality control, and streamlined global export logistics from Ningbo, China.