The Simpson 4 x 8 Column Base Black Powder Coated is a cast-in-place post base from Simpson engineered to anchor 4 x 8 wood column members securely to concrete foundations and slabs while resisting lateral rotation at the base. The bottom of the base plate sits flush with the concrete surface, delivering a low-profile installation that works equally well in structural framing and exposed architectural applications. A textured flat black powder-coat finish sets this column base apart from standard painted hardware, making it a practical choice wherever a refined, durable appearance matters as much as performance.

Key Features

• Textured Black Powder-Coat Finish - Provides a more durable, visually refined surface than standard paint, making this column base well-suited for exposed and decorative framing where appearance is part of the design.
• Flush Base Plate Design - The bottom of the base plate is engineered to sit flush with the concrete surface, resulting in a clean, low-profile installation that integrates neatly into both structural and architectural column applications.
• Cast-in-Place Installation - Set directly into concrete during the pour for a secure, integrated post-to-concrete connection that is built into the foundation rather than surface-mounted after curing.
• Rotation Resistance - Engineered to help prevent lateral rotation at the column base, supporting structural integrity in top-supported column installations where stability under load is critical.
• Wind and Seismic Load Capability - Carries a 60% allowable load increase for wind and earthquake applications, making it a reliable choice for residential and light commercial projects in demanding environments.
• United States Origin - Produced domestically under Simpson quality standards, supporting consistency in materials and manufacturing that structural and architectural applications depend on.

Why This Product

• Finish Built for Exposed Installations - The textured black powder-coat is not purely cosmetic - it offers meaningful durability advantages over standard painted column bases, making this hardware a natural fit for visible post-to-concrete connections in porches, pergolas, and architectural framing.
• Engineered for Load Demands Beyond Standard Use - With a 60% allowable load increase for wind and seismic conditions, this column base is suited for projects where structural performance under lateral forces is a code or design requirement, not just a preference.
• Clean, Integrated Look at Grade - The flush base plate design eliminates the raised or exposed base appearance common to surface-mounted alternatives, giving concrete slab and foundation installations a finished, intentional look from the ground up.
• Purpose-Built Fit for 4 x 8 Members - Sized specifically for 4 x 8 wood columns rather than adapted from a generic connector, this base provides a precise fit that supports proper load transfer and a professional installation result.

Specifications

• Manufacturer: Simpson Strong-Tie
• Model / MPN: CB48PC
• Nominal Column Size: 4 x 8
• Finish: Textured Black Powder-Coat
• Steel Thickness (Gauge): 7 Gauge
• Fasteners Required: Bolts - (2) 5/8" (sold separately)
• For Treated Lumber: No
• Installation Type: Cast-in-Place
• Width 1: 3-9/16 in.
• Width 2: 7-1/2 in.
• Country of Origin: United States

Approved Applications

• Securing 4 x 8 wood columns to concrete foundations and slabs
• Structural post-to-concrete connections in residential and light commercial construction
• Architectural column installations where an exposed, decorative black finish is desired
• Applications requiring wind or seismic load resistance (60% allowable load increase for wind/earthquake)
• Top-supported column installations where lateral rotation resistance is required

What's Included

• 1 x Simpson Strong-Tie CB48PC Column Base (black powder-coat finish)
• Note: (2) 5/8" bolts are required for installation and are not included.

Disclaimer: Product dimensions and/or screw or bolt holes may differ from picture.

Frequently Asked Questions

What size wood column member is the CB48PC designed to fit?

The CB48PC is engineered specifically to secure 4 x 8 wood column members at their base.

How is the CB48PC installed - can it be added after concrete has cured?

The CB48PC is a cast-in-place column base, meaning it is designed to be set into concrete during the pour for a secure, integrated connection. It is not intended for post-pour surface mounting.

How does the powder-coat finish on the CB48PC differ from a standard painted finish?

The CB48PC features a textured flat black powder-coat finish, which is significantly more durable and visually refined compared to standard painted alternatives. This makes it well suited for both structural applications and exposed, decorative framing projects where appearance matters.

Does the CB48PC have any rating for wind or seismic loads?

Yes. The CB48PC carries allowable loads that have been increased 60% for wind or earthquake loading, making it appropriate for use in applications where wind and seismic resistance are required.