The Simpson 4x8 Column Base Hot Dip Galvanized is a heavy-duty structural connector from Simpson engineered to anchor lumber, glulam, and engineered wood posts securely to concrete foundations. Built for cast-in-place or wet-set concrete installations, the base plate sits flush with the concrete surface to deliver full post bearing and dependable structural performance across residential and commercial column applications. The hot-dip galvanized finish provides robust corrosion resistance, making this column base a reliable choice for exposed, high-moisture, and other demanding environments where long-term durability is critical.

Key Features

• Compatible with lumber, glulam, and engineered wood posts - gives builders and contractors flexible column options without needing multiple connector types on the job site.
• Cast-in-place and wet-set installation method - allows the connector to be positioned precisely during the concrete pour, resulting in a flush base plate that provides full post bearing for maximum load transfer.
• Hot-dip galvanized finish - delivers a thick, uniform coating of corrosion protection suited for outdoor, coastal, and other corrosion-prone environments where a standard finish would deteriorate prematurely.
• Rated for wind and seismic load applications - means the connector meets the structural demands of code-required high uplift resistance, supporting use on projects in regions with strict lateral and uplift design requirements.
• Made in the United States - reflects consistent quality control standards and material sourcing from a trusted structural connector manufacturer.

Why This Product

• One connector, multiple post materials - because the base accommodates lumber, glulam, and engineered wood products, structural engineers and contractors can specify a single connector type for a variety of column configurations on the same project.
• Purpose-built corrosion resistance - the hot-dip galvanized process bonds a heavy protective zinc layer to the steel, making this column base well-suited for exposed decks, covered porches, coastal construction, and other environments where moisture or chemicals accelerate corrosion.
• Engineered for high-demand structural applications - with support for wind and seismic load-rated construction projects and high uplift resistance, this post base is appropriate for applications where connection performance is non-negotiable.
• Flush base plate design - ensures full contact between the post and concrete surface, optimizing load distribution and reducing the risk of point loading or settlement issues over the life of the structure.

Specifications

• Manufacturer: Simpson Strong-Tie
• Manufacturer Part Number (MPN): CB48HDG
• Nominal Column Size: 4 x 8
• Finish: Hot-Dip Galvanized (HDG)
• Fasteners Required: Bolts - (2) 5/8" (sold separately)
• Width 1: 3-9/16 in.
• Width 2: 7-1/2 in.
• Country of Origin: United States

Approved Applications

• Connecting lumber, glulam, and engineered wood posts to concrete foundations
• Cast-in-place concrete foundation installations
• Wet-set concrete foundation installations
• Structural column applications requiring high uplift resistance
• Wind and seismic load-rated construction projects
• Exposed or corrosion-prone environments where galvanized protection is required

What's Included

• 1x Simpson Strong-Tie CB48HDG 4 x 8 Hot-Dip Galvanized Column Base

Note: Fasteners (2 x 5/8" bolts) are required but not included.

Options

• 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 types of posts and materials is the CB48HDG compatible with?

The CB48HDG is designed to connect lumber, glulam, and engineered wood product posts to concrete foundations, making it compatible with a wide range of standard and engineered wood column sizes.

How is the CB48HDG installed?

This column base is designed for cast-in-place or wet-set installation into concrete. The base plate sits flush with the concrete surface to provide full post bearing, ensuring maximum structural contact and load transfer.

What fasteners are required to install the CB48HDG?

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

Why is the hot-dip galvanized finish used on the CB48HDG?

The hot-dip galvanized finish provides superior corrosion resistance compared to standard finishes, making the CB48HDG well-suited for exposed outdoor environments and other demanding conditions where moisture or the elements could compromise a standard steel connector over time.