The Simpson CBT4Z-KT Concealed Beam Tie Kit from Simpson is a hidden structural connector engineered to join horizontal beams atop vertical posts while keeping the connection completely out of sight. Part of Simpson's concealed connector system alongside the CPTZ and CJT, this cylindrical beam tie maintains a continuous structural load path from the beam down through the post and into the foundation - without requiring challenging kerf cuts. ZMAX galvanization on both the connector and the included dowels makes it a dependable choice for exterior framing and treated-lumber construction where corrosion resistance is essential.

Key Features

• Cylindrical design installs with a common drill bit - eliminates the need for complex kerf cuts, making installation faster and more accessible for the installer
• Flattened sides allow the CBTZ to double as a template - simplifies layout and reduces the chance of drilling errors during installation
• Locator tabs provide proper dimensional layout - ensure accurate positioning so the connector seats correctly within the post and beam
• Orientation markings distinguish the post end from the beam end - remove guesswork during installation and help prevent costly mistakes
• Required 1/2 in. x 4-3/4 in. dowel pins are included in the kit - everything needed for a complete, code-ready installation arrives together
• ZMAX galvanization on the CBTZ offers extra corrosion resistance - suited for exterior applications and direct contact with treated wood where standard coatings may fall short
• 1/2 in.-diameter drift dowels are mechanically galvanized in accordance with ASTM B695, Class 55 - ensures the fasteners match the corrosion-resistance standard of the connector itself
• Sized for a nominal 6x6 post and made from 12-gauge steel - delivers structural integrity appropriate for load-bearing post-and-beam framing applications

Why This Product

• Truly concealed structural performance - the cylindrical profile installs entirely within the wood members, preserving a clean architectural finish on exposed post-and-beam assemblies without sacrificing load-path continuity from beam to foundation
• Built-in installation aids reduce jobsite errors - flattened template sides, locator tabs, and clear orientation markings work together to guide the installer through proper placement, minimizing rework on structural connections where precision matters
• Corrosion resistance engineered throughout the entire kit - ZMAX galvanization on the connector body and ASTM B695, Class 55 mechanically galvanized dowels mean every component in the kit meets the same elevated standard for exterior and treated-wood environments
• Part of a compatible concealed connector system - the CBTZ is designed to work with the CPTZ post base and CJT connectors, allowing builders to maintain a fully hidden structural system from the foundation up through the framing

Specifications

• Manufacturer: Simpson Strong-Tie
• MPN: CBT4Z-KT
• Finish / Coating: ZMAX
• Gauge: 12
• Dimensions: 1-1/4 in. x 14 in.
• Member / Post Size: 6x6 (nominal)
• Depth: 1-1/4 in.
• Height: 14 in.
• Material: 12-gauge steel
• Dowel Diameter: 1/2 in.
• Dowel Galvanization Standard: ASTM B695, Class 55
• Installation Fasteners: Install with (6) 1/2 in. x 4-3/4 in. dowels (included) or 1/2 in. bolts
• Country of Origin: United States

Approved Applications

• General Framing

What's Included

Each kit contains (1) CBT4Z-KT Concealed Beam Tie, (6) 1/2 in. x 4-3/4 in. dowels.

Downloads and Resources

• View Spec Sheet

Frequently Asked Questions

What type of connection does the Simpson CBT4Z-KT make?

The CBTZ Concealed Beam Tie is designed to connect horizontal beams atop a vertical post. It continues the structural load path into the foundation through the CPTZ, making it a key component of Simpson Strong-Tie's concealed connector system, which also includes the CJT.

Is this connector suitable for exterior or treated-lumber applications?

Yes. The CBTZ features ZMAX galvanization, which offers extra corrosion resistance specifically suited for exterior and treated-wood applications. Additionally, the included 1/2 in.-diameter drift dowels are mechanically galvanized in accordance with ASTM B695, Class 55.

What tools and fasteners are needed to install the CBT4Z-KT?

The cylindrical design of the CBTZ allows installation using a common drill bit, eliminating the need for challenging kerf cuts. The connector installs with (6) 1/2 in. x 4-3/4 in. dowels, which are included in the kit, or 1/2 in. bolts. Flattened sides allow the CBTZ to be used as a template, and locator tabs assist with proper dimensional layout.

What post size is the CBT4Z-KT sized for?

The CBT4Z-KT is sized for a nominal 6x6 post. The connector measures 1-1/4 in. x 14 in. and is made from 12-gauge steel. Orientation markings on the connector clearly distinguish which end installs into the post and which end goes into the beam.