The Simpson Rough 6x6 Column Base Hot Dip Galvanized is a heavy-duty post base connector from Simpson engineered to anchor rough-cut 6x6 posts securely to concrete foundations. Designed for cast-in-place or wet-set installation, this column base positions the base plate flush with the concrete surface to deliver full post bearing - making it a dependable choice for structural columns in residential and commercial construction, including applications subject to wind or seismic uplift forces. The hot-dip galvanized finish makes it equally well suited for outdoor settings and corrosion-prone environments where long-term durability is non-negotiable.

Key Features

• Fits rough-cut 6x6 posts - accommodates lumber, glulam, and engineered wood products in that nominal size, giving builders flexibility across a range of column materials.
• Cast-in-place or wet-set installation - the base plate sits flush with the concrete surface, enabling full post bearing and a cleaner, structurally sound connection at the foundation.
• Hot-dip galvanized finish - provides robust corrosion resistance for outdoor, exposed, and high-moisture environments where standard finishes fall short.
• Engineered for high structural load values - supports demanding post-to-concrete foundation connections including those subject to uplift forces from wind or seismic activity.
• Made in the United States by Simpson - manufactured to consistent quality standards by a trusted name in structural connectors.

Why This Product

• Built for tough environments - the hot-dip galvanized coating delivers a level of corrosion protection that makes this column base a reliable long-term solution for outdoor decks, pergolas, covered structures, and other exposed applications.
• Versatile material compatibility - by accepting lumber, glulam, and engineered wood products, this post base works across a wide variety of structural column assemblies without requiring a specialized connector for each material type.
• Flush-mount design promotes structural integrity - the base plate sitting flush with the concrete surface ensures full post bearing, which directly supports the high load values required in demanding residential and commercial structural applications.
• Engineered for uplift-critical connections - with approved applications that include wind and seismic uplift forces, this column base is a dependable choice when code compliance and structural performance are the top priority.

Specifications

• Manufacturer: Simpson Strong-Tie
• Manufacturer Part Number (MPN): CB66RHDG
• Nominal Column Size: 6 x 6 Rough Cut
• Finish: Hot-Dip Galvanized (HDG)
• Fasteners Required: Bolts - (2) 5/8" (sold separately)
• Country of Origin: United States

Approved Applications

• Post-to-concrete foundation connections
• Structural columns using lumber, glulam, or engineered wood products
• Residential and commercial construction projects requiring high structural load values
• Applications subject to wind or seismic uplift forces
• Outdoor and corrosion-prone environments where a hot-dip galvanized finish is required

What's Included

• 1 x Simpson Strong-Tie CB66RHDG Rough 6 x 6 Column Base (Hot-Dip Galvanized)
• Note: (2) 5/8" bolts are required for installation and are 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 post size is the CB66RHDG designed to fit?

The CB66RHDG is designed to fit a rough-cut 6 x 6 post. It accommodates lumber, glulam, and engineered wood products in that size.

How is the CB66RHDG installed?

The CB66RHDG is installed using a cast-in-place or wet-set method into concrete. The base plate is positioned so it sits flush with the concrete surface, which allows for full post bearing once the post is set.

What fasteners are required to use the CB66RHDG?

The CB66RHDG requires two 5/8" bolts. The bolt hole locations are designed to meet code-required spacing for optimal load capacity.

Why is the CB66RHDG hot-dip galvanized instead of using a standard finish?

The hot-dip galvanized finish provides superior corrosion resistance compared to standard coatings, making the CB66RHDG well suited for demanding environments where moisture or harsh conditions could compromise a standard connector over time.