The Simpson CB7 1/8-4 Post Base is a structural column base from Simpson engineered to connect PSL 7 1/8 in. x 4 in. posts to concrete foundations with a flush, full-bearing installation. Built for cast-in-place or wet-set concrete applications, this column base delivers the high structural values and code-compliant performance required in residential, commercial, and industrial construction using lumber, glulam, and engineered wood product columns.

Key Features

• Engineered fit for PSL 7 1/8 in. x 4 in. columns - eliminates guesswork and ensures a precise, secure connection for the exact column size, reducing installation errors on the job site.
• Cast-in-place or wet-set installation with flush base plate - the base plate sits flush with the concrete surface, providing full post bearing and maximum load transfer directly to the foundation.
• Designed for increased uplift resistance - supports applications under wind or seismic loading conditions, giving builders confidence in structural integrity where lateral and uplift forces are a concern.
• Simpson gray paint finish - provides a durable protective coating suited to structural environments and consistent with Simpson connector standards.
• Compatible with lumber, glulam, and engineered wood products - versatile across common column materials used in modern structural framing, making it a practical choice for a wide range of project types.
• Domestic production - produced in the United States, supporting consistent quality standards expected from a trusted structural hardware brand.

Why This Product

• Purpose-built for a specific column dimension - unlike generic post bases, this connector is sized exactly for PSL 7 1/8 in. x 4 in. columns, meaning a secure, properly bearing connection without modification or shimming.
• Handles demanding structural loads - with high structural values and code-compliant bolt hole spacing, this column base is suited to projects where wind, seismic, or heavy vertical loads require a connector that can perform under pressure.
• Flexible material compatibility - works with lumber, glulam, and engineered wood product columns, so builders are not limited to a single material type when specifying this base for a project.
• Straightforward wet-set installation - the cast-in-place design simplifies foundation work by allowing the base to be set during the concrete pour, reducing return trips and keeping structural timelines on track.

Specifications

• Manufacturer: Simpson Strong-Tie
• MPN: CB7 1/8-4
• Nominal Column Size: PSL 7-1/8" x 4"
• Finish: Simpson Strong-Tie gray paint
• Fasteners Required: Bolts - (2) 5/8" (sold separately)
• Width 1: 7-1/4 in.
• Width 2: 3-1/2 in.
• Country of Origin: United States

Approved Applications

• Connecting posts to concrete foundations in structural construction
• Use with lumber, glulam, and engineered wood product column sizes
• Applications requiring increased uplift resistance under wind or seismic loading
• Projects demanding high structural values and code-compliant bolt hole spacing
• Cast-in-place or wet-set concrete foundation connections

What's Included

• 1x Simpson Strong-Tie CB7 1/8-4 Column Base
• Note: Fasteners (2) 5/8" bolts required - not included

• Contact us for Configurable Options and Special orders

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

Frequently Asked Questions

What column size is the CB7 1/8-4 designed for?

The CB7 1/8-4 is engineered specifically for PSL 7-1/8" x 4" column sizes, providing a precise, secure fit for lumber, glulam, and engineered wood product columns of that dimension.

How is the CB7 1/8-4 installed?

The CB7 1/8-4 is designed for cast-in-place or wet-set installation into concrete. The base plate sits flush with the concrete surface, ensuring full post bearing and maximum load transfer to the foundation.

What fasteners are required to install the CB7 1/8-4?

Installation requires two 5/8" bolts. The bolt hole locations are designed to meet code-required spacing for optimal load capacity.

Is the CB7 1/8-4 suitable for high-wind or seismic applications?

Yes. The CB7 1/8-4 features increased uplift resistance, making it well suited for structural applications subject to wind or seismic loading, including residential, commercial, and industrial construction.