The Simpson OCB66 Ornamental Column Base 6x6 Black Powder Coated is a cast-in-place column base engineered for 6 x 6 wood post installations where both structural performance and refined appearance matter. Designed to prevent wood members from rotating at the base connection, the OCB66 pairs dependable engineering with a flat black powder-coated finish that elevates the look of exposed architectural columns, outdoor structures, and decorative post applications alike.

Key Features

• Cast-in-place design prevents post rotation - keeps 6 x 6 wood members firmly anchored and correctly aligned, reducing movement that could compromise the integrity of the overall structure over time.
• Flush base plate installation - the base plate sits flush with the concrete surface, producing a clean, low-profile look that suits both structural builds and finished architectural settings.
• Flat black powder-coated finish - delivers a more durable and better-looking result than standard paint, with superior resistance to chipping, fading, and corrosion in exposed or outdoor environments.
• 60% allowable load increase for wind or seismic loading - makes the OCB66 suitable for installations in areas subject to wind or earthquake forces, broadening its range of approved structural applications.
• Requires only two fasteners for installation - connects with two 5/8 in. machine bolts, keeping the installation process straightforward without sacrificing holding strength.

Why This Product

• Ornamental finish meets structural function - the flat black powder-coated surface gives decorative column installations a polished, intentional appearance without compromising the load-bearing performance expected from a dedicated post base.
• Built for demanding load conditions - the allowable 60% load increase for wind or seismic applications means this column base works in structurally critical settings, not just light-duty decorative ones.
• Domestically produced quality - the OCB66 is a product of United States manufacturing, reflecting Simpson's commitment to consistent dimensional accuracy and material standards across their connector lineup.
• Versatile fit for architectural and structural projects - whether the priority is a clean finished look on an exposed porch column or a code-compliant connection on a structural post, the OCB66 is an approved solution for both use cases.

Specifications

• Specification: Detail
• Model Number: OCB66
• Gauge: 3
• Width 1: 51/2
• Width 2: 51/2
• Coating: Powder Coating, Black
• Fasteners Required: (2) 5/8" Machine Bolts
• Country of Origin: United States

Approved Applications

• Cast-in-place column base connections for 6 x 6 wood post installations
• Structural post bases in applications subject to wind or seismic loading (60% load increase allowable)
• Exposed architectural column bases where an ornamental black powder-coated finish is desired
• Installations requiring base plate to sit flush with the concrete surface
• Applications requiring minimum 3" side cover from the concrete edge for full allowable loads

Installation Notes

• Install all models with the bottom of the base plate flush with the concrete.
• Fasteners required: (2) 5/8" Machine Bolts.
• Allowable loads have been increased 60% for wind or earthquake loading. No further increase allowed; reduce where other loads govern.
• Minimum side cover for full loads is 3" for CB-series column bases.

Frequently Asked Questions

What post size is the OCB66 compatible with?

The OCB66 is specifically designed for 6 x 6 post applications, making it suitable for standard 6 x 6 wood column installations in both structural and decorative settings.

How does the powder-coated finish differ from standard paint?

The flat black powder-coated finish on the OCB66 produces a more durable and better-looking result than standard paint, offering superior resistance to chipping, fading, and corrosion - making it well suited for outdoor and exposed environments.

How is the OCB66 installed?

The OCB66 is a cast-in-place column base, meaning it is set into concrete during the pour. The base plate is designed to install flush with the concrete surface, resulting in a clean, low-profile appearance once installation is complete.

Is the OCB66 rated for wind and seismic loads?

Yes. The OCB66 carries allowable loads that have been increased 60% for wind or earthquake loading. No further increase beyond that adjustment is allowed, and loads should be reduced where other load conditions govern.