The Simpson OCB48 Ornamental Column Base 4 x 8 Black Powder Coated is a cast-in-place column base engineered by Simpson to prevent wood members from rotating at their base connection. Designed so the bottom of the base plate sits flush with the concrete surface, this ornamental column base pairs structural reliability with a flat black powder-coated finish that delivers a cleaner, more refined appearance than standard paint - making it a practical choice for both load-bearing performance and visible exterior or interior post installations.

Key Features

• Cast-in-place design - helps prevent wood posts and columns from rotating, providing a stable, code-conscious connection at the base
• Flush base plate installation - the base plate bottom is designed to sit flush with the concrete surface, resulting in a clean finished look with no exposed gap beneath the column
• Flat black powder-coated finish - more durable and better-looking than standard paint, offering enhanced resistance to wear and corrosion in exposed applications where appearance matters
• 60% load increase for wind or seismic events - allowable loads are increased 60% for wind or earthquake loading, giving builders confidence in high-demand structural scenarios without requiring a separate hardware upgrade
• 3 in. minimum side cover requirement for full loads - a clearly defined installation parameter that helps contractors plan concrete placement accurately and achieve the full rated load capacity

Why This Product

• Structural and visual performance in one product - the combination of a rotation-resistant cast-in-place connection and a refined powder-coated finish means this column base handles load demands while contributing to a polished finished appearance on decorative post and column installations
• Built for demanding load conditions - the 60% allowable load increase for wind or earthquake loading makes this base well-suited for projects in high-wind or seismic zones where standard hardware may fall short
• American-made quality from a trusted structural hardware brand - produced by Simpson, a name recognized across the construction industry for engineered connector reliability, this column base reflects consistent manufacturing standards
• Finish that outlasts paint - the flat black powder coat is purpose-built for durability, resisting chips, wear, and corrosion better than conventional paint finishes on exposed or semi-exposed column bases

Specifications

• Model Number: OCB48
• Gauge: 3
• Width 1: 3 9/16 in.
• Width 2: 7 1/2 in.
• Coating/Material: Powder Coating, Black
• Fasteners Required: (2) 5/8" Machine Bolts
• Country of Origin: United States

Frequently Asked Questions

How is the OCB48 column base installed?

Install all models with the bottom of the base plate flush with the concrete. The OCB48 requires (2) 5/8" Machine Bolts for fastening.

What is the minimum side cover required for full load capacity?

The minimum side cover for full loads is 3" for CBs. Ensure this clearance is maintained to achieve rated load performance.

Are the allowable loads increased for seismic or wind events?

Yes. Allowable loads have been increased 60% for wind or earthquake loading. No further increase is allowed, and loads should be reduced where other loads govern.

Why choose a powder-coated finish over standard paint?

The flat black powder-coated finish produces a much more durable and better-looking finish than standard paint, offering enhanced resistance to wear and corrosion in exposed applications.

Note: Product dimensions and/or screw or bolt holes may differ from picture. Please see item description for specifications.