The Simpson CBST46Z CBST ZMAX Standoff Column Base is a cast-in-place column base engineered by Simpson to deliver a secure, long-lasting connection between 4x6 wood posts and concrete foundations in residential and light commercial construction. Built with a code-required 1 in. standoff and ZMAX galvanization, this post base is purpose-built to protect structural wood from moisture-related rot and corrosion in demanding exterior and treated-wood applications. Key Features Code-required 1 in. standoff design - elevates the post above the concrete surface, keeping wood away from standing moisture and resisting post-end rot for a longer-lasting structural connection S-shaped bearing tabs - provide increased strength, allowing for higher download capacity so the connection holds up under greater structural loads ZMAX galvanization - delivers extra corrosion resistance beyond standard coatings, making this column base well suited for exterior environments and use with treated lumber Dual-gauge steel construction (base 12, strap 10) - combines a sturdy base plate with a heavier strap for added durability where it matters most Fits nominal 4x6 posts - designed specifically for 4x6 column sizes, ensuring a precise, code-compliant fit without guesswork Why This Product Built-in moisture protection - the 1 in. standoff is not just a convenience feature; it is a code-required design element that actively separates the post end from concrete, reducing the risk of rot and extending the life of the entire structure Ready for treated-wood and exterior use - ZMAX galvanization is specifically engineered for the corrosive conditions associated with pressure-treated lumber and outdoor exposure, where standard galvanized finishes fall short Higher download capacity through smarter engineering - the S-shaped bearing tabs add meaningful structural strength, making this standoff post base a capable choice for applications where loads demand more than a basic column connector can offer American-made Simpson quality - produced in the United States and backed by Simpson engineering, this column base is a trusted hardware solution for contractors and builders who need reliable wood-to-concrete connections on every job Specifications Model Number: CBST46Z Member Size: 4x6 Width 1: 3-9/16 in. Width 2: 5-5/16 in. Depth: 7-13/16 in. Height: 8-11/16 in. Gauge: Base 12; strap 10 Coating: ZMAX Finish: ZMAX Install With: Install with (2) 5/8 in. diameter machine bolts (sold separately) Country of Origin: United States Frequently Asked Questions What is the purpose of the 1 in. standoff design on the CBST46Z? The code-required 1 in. standoff design elevates the wood post above the concrete surface, protecting it from moisture exposure and resisting post-end rot for a longer-lasting structural connection. What post size is the CBST46Z designed to fit? The CBST46Z is designed for a nominal column size of 4x6. What hardware is needed to install the CBST46Z? The CBST46Z should be installed with (2) 5/8 in. diameter machine bolts. Why does the CBST46Z feature ZMAX galvanization? ZMAX galvanization provides extra corrosion resistance, making the CBST46Z well suited for exterior applications and use with treated wood where standard coatings may not offer sufficient protection. Note: Product dimensions and/or screw or bolt holes may differ from picture. Please see item description for specifications.
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