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CBTZ Concealed Beam Tie

CBTZ is part of the concealed structural connector line that combines structural strength with invisibility. Designed to connect horizontal beams atop a vertical post, the CBTZ continues the structural load path into the foundation through the CPTZ. The simplistic cylindrical design allows installations with a common drill bit, eliminating challenging kerf cuts. The CBTZ is available in two models designed to connect beams and posts of a variety of sizes. It is part of a concealed connector system that includes the CPTZ and CJT.

Key Features

  • Flattened sides assist installer while using the CBTZ as a template
  • Locator tabs provide proper dimensional layout
  • Required dowel pins included
  • Orientation markings distinguish which end installs into the post and which end goes into the beam


  • CBT — ZMAX® coating; the 1/2"-diameter drift dowels are mechanically galvanized in accordance with ASTM B695, Class 55


  • Use all specified fasteners; see General Notes
  • 1/2" dowels included
  • CBT2Z requires a minimum 6"-deep nominal beam
  • For step-by-step installation instructions, see technical bulletin CBTZ Concealed Beam Tie Installation Instructions (T-C-CBTZINS) or view our video in the image gallery

Related Literature

Load Tables

  These products are available with additional corrosion protection.

CBTZ Concealed Beam Tie Load Table
  1. Uplift and lateral loads have been increased for wind or earthquake loading, with no further increase allowed; reduce where other loads govern.
  2. Lateral load is in the direction parallel to the beam.
  3. Alternative 1/2"-diameter hex- or square-head machine bolts may be used for loads listed.
  4. Lag or carriage bolts are not permitted.
  5. Structural composite lumber columns have sides that show either the wide face or the edges of the lumber strands/veneers. Values in the tables reflect dowel or bolt installation into the wide face.
  6. See figure for placement of the additional SDS fasteners required for the splice connection.
  7. Dowels included in CBTZ kits do not match required lengths for the multi-ply application. The sizes shown in the table above need to be ordered separately or trimmed in the field.
  8. Built-up lumber (multiple members) must be fastened together to act as one to resist the applied load (excluding the connector fasteners). This must be determined by the Designer.
  9. Center CBTZ on built-up beam. Loads are applicable to beam installation flush to one side of post or beam centered on post.

Code Reports & Compliance