The Simpson CB48 4x8 Column Base from Simpson is engineered to connect posts to concrete foundations across a wide range of lumber, glulam, and engineered wood product sizes. Designed for either cast-in-place or wet-set installation, the base plate sits flush with the concrete surface to provide full post bearing, ensuring reliable load transfer from column to foundation. Built from 7-gauge steel with a G90 zinc galvanized finish, this column base is the go-to choice for structural applications that demand high load values and rugged, long-term performance.

Key Features

• Increased uplift resistance for wind or seismic loading - helps safeguard structures in high-wind or earthquake-prone regions, giving builders confidence in critical connections.
• Bolt hole locations meet code-required spacing for optimal capacity - reduces guesswork during installation and helps ensure the connection performs to its rated structural values.
• Nominal column size: 4x8 - precisely sized for 4x8 lumber, glulam, and engineered wood columns, making this a direct fit without modification.
• Made from 7-gauge steel - heavy-duty construction delivers the rigidity and strength needed for demanding structural column applications.
• Galvanized (G90) for extra corrosion resistance - the zinc G90 coating provides a durable barrier against moisture and environmental exposure, extending the service life of the connector.

Why This Product

• Versatile installation options - cast-in-place or wet-set compatibility gives contractors flexibility to work within different concrete pour schedules and project timelines without sacrificing structural integrity.
• Built for high-demand structural connections - the combination of 7-gauge steel construction and engineered bolt hole positioning makes this column base well-suited for posts carrying significant loads in both residential and commercial framing applications.
• Corrosion-resistant finish for lasting performance - the G90 zinc galvanized coating is specifically suited for environments where moisture exposure is a concern, helping the connector maintain its structural reliability over time.
• Broad material compatibility - supports a wide range of lumber types including standard dimensional lumber, glulam, and engineered wood products, making it a flexible choice across different structural column applications.

Specifications

• Manufacturer Part Number (MPN): CB48
• Brand: Simpson Strong-Tie
• Nominal Column Size: 4x8
• Width 1: 3-9/16 in.
• Width 2: 7-1/2 in.
• Gauge: 7
• Coating / Finish: Zinc Galvanized, G90
• Install With: (2) 5/8-in. diameter machine bolts (sold separately)
• Country of Origin: United States

Options

• Contact us for Configurable Options and Special orders

Frequently Asked Questions

What installation methods are supported for the CB48 column base?

The CB48 is designed to be either cast-in-place or wet set into concrete. In both methods, the bottom of the base plate sits flush with the concrete surface, ensuring full post bearing for maximum load transfer.

What type of posts or lumber can the CB48 support?

The CB48 is designed to connect posts to concrete foundations for a wide range of lumber, glulam, and engineered wood product sizes. It is specifically sized for a nominal 4x8 column member.

What fasteners are required to install the CB48?

Installation requires two (2) 5/8-in. diameter machine bolts. The bolt hole locations are positioned to meet code-required spacing for optimal load capacity.

Why is the G90 galvanized coating important for this column base?

The G90 zinc galvanized finish provides extra corrosion resistance, making the CB48 suitable for environments where exposure to moisture or the elements could degrade an uncoated steel connector over time.

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