Description

Key Features

Wet-Set Install

This base embeds in wet concrete at the time of pour, so you can lock in post placement from the start instead of coming back to retrofit later.

1-Inch Standoff

The built-in standoff keeps the wood post off the concrete surface, which helps reduce moisture contact and potential decay at the post end.

Simpson Strong-Tie Column Base

The Simpson Strong-Tie CBSQ66-SDS2 column base uses included Strong-Drive connector screws for faster installation, a cleaner reveal, and a high-capacity wood-to-concrete connection.

Overview

The Simpson Strong-Tie CBSQ66-SDS2 column base is a cast-in-place post base for securing a nominal 6×6 wood post or column to concrete. This is a column base designed for securing a nominal 6×6 wood post to wet concrete. Model number CBSQ66-SDS2. It is built for deck posts, patio covers, and other top-supported structures where you want the post anchored into the pour and held off the slab surface.

What matters here is how the connection gets made. This CBSQ series base is installed while the concrete is still wet, so the anchor portion is locked into the footing from the start. That makes it a good fit for new construction where layout is known ahead of time. Simpson also includes the required 1/4 in. x 2 in. Strong-Drive SDS heavy-duty connector screws, which speeds up post attachment and avoids the extra step of sourcing separate fasteners.

The 1-inch standoff is not just a detail for the spec sheet. It keeps the bottom of the post elevated above the concrete, which helps reduce direct moisture contact at the most vulnerable part of the wood. If you are building outdoors, that gap matters because it helps protect the end grain and supports code-driven post separation from the slab or pier.

From a build standpoint, this is a steel column base with a G90 galvanized finish for corrosion resistance. The listed steel thickness is 12-gauge at the base and 10-gauge at the strap, which tells you this is made to handle structural connector duty rather than light decorative use. It also ships with the base plate assembled, which saves setup time and helps keep the install process straightforward on site.

For fitment, this model is intended for wood-to-concrete cast-in-place applications and sized around a nominal 6×6 column. It is a fixed base, not an adjustable one, so this is the right hardware when your post size and layout are already established before the pour. If you are setting support posts for a deck or covered outdoor structure, the fixed format helps keep the connection simple and solid.

This is a smart buy for contractors, deck builders, and serious DIY users who are pouring new concrete and want a purpose-built post base instead of piecing together an anchor solution. If your job calls for a clean standoff, included connector screws, and a cast-in-place installation method, the Simpson Strong-Tie CBSQ66-SDS2 column base is the kind of hardware that makes sense because it solves the connection the right way the first time.

Built for New Concrete Pours

If you are pouring fresh footings or piers, this cast-in-place post base gives you a clean way to anchor the post from day one. The standoff design also keeps the wood post off the concrete where moisture tends to collect.

• Embeds in wet concrete at the time of pour
• Provides a 1 in. standoff between post and concrete
• Used for decks, patio covers, and other top-supported structures

Fasten the Post Without Extra Guesswork

This hardware is set up around Strong-Drive connector screws, which helps make installation quicker and more consistent. For crews trying to keep structural hardware moving without slowing down the job, included fasteners are a real advantage.

• Installs with 1/4 in. x 2 in. Strong-Drive SDS heavy-duty connector screws
• Screws are included
• Base plate ships assembled

What’s in the Box

• (1) Simpson Strong-Tie CBSQ66-SDS2 column base
• Strong-Drive SDS heavy-duty connector screws

Key Specifications

Type	Column base
Material	Steel
Finish	G90 galvanized
Materials Connected	Wood to concrete, cast in place
Common Measurement	6 in. x 6 in.
Actual Width	6.031 in.
Actual Depth	5.344 in.
Weight	6.21 lbs
Adjustable	No
Base Gauge	12-gauge
Strap Gauge	10-gauge
Screws Included	Yes

Compatibility

Post Size

Designed for a nominal 6×6 wood post or column.

Concrete Installation

Made for cast-in-place installation in wet concrete, not post-installed hardened concrete anchoring.

Fasteners

Uses 1/4 in. x 2 in. Strong-Drive SDS heavy-duty connector screws, which are included.

Built For

Deck Building Patio Covers Outdoor Structures Construction General Contracting Remodeling DIY / Hobbyist

Pro Tip

Because this is a fixed cast-in-place base, take the time to confirm your post layout before the concrete sets. Once it is embedded, position is locked in, so getting alignment right up front saves a lot of headache later.

Warranty & Support

Warranty listed: None.

Tool Nut’s Take

Tool Nut’s Take

Simpson Strong-Tie CBSQ66-SDS2 Column Base for Clean 6×6 Post Work

If you are pouring new concrete and want a proper 6×6 post connection with built-in standoff protection, this is the kind of hardware worth doing once and doing right.

• Who it’s for: Deck builders, framing crews, contractors, and serious DIY users setting nominal 6×6 posts into new concrete work.
• Why it stands out: Cast-in-place design, included SDS connector screws, assembled base plate, and a 1-inch standoff that helps protect the post base from moisture.
• Worth knowing: This is not adjustable, so layout matters. It is best when your post size and footing plan are already nailed down before the pour.

Common Questions

• What size post is this made for? It is designed for a nominal 6 in. x 6 in. wood post or column.
• Is this for wet concrete or existing hardened concrete? This model is made to embed in wet concrete at the time of pour.
• Does it keep the wood off the concrete? Yes. It provides a 1 in. standoff between the post and the concrete surface.
• Are the connector screws included? Yes. It installs with 1/4 in. x 2 in. Strong-Drive SDS heavy-duty connector screws, and the screws are included.