The Simpson 4x6 Post Cap with ZMAX Finish is an 18-gauge steel connector engineered to create a positive, reliable connection between a 4x6 post and a wood deck or beam. Built by Simpson and finished with ZMAX galvanization for enhanced corrosion resistance, this post cap is designed for exterior and treated-wood applications where a stronger-than-nailing connection is required. The BC series dual-purpose design allows this connector to function as either a post cap or a post base, making it a practical choice for light-duty deck framing and patio cover construction.

Key Features

• Positive post-to-deck connection - mechanically locks the 4x6 post to the wood structure, delivering a more secure hold than angled nailing or screw fastening alone.
• Reduces post splitting and eliminates end-grain nailing - protects the structural integrity of the post over time, helping the connection maintain its strength through seasonal movement and loading.
• 18-gauge steel construction - provides reliable performance for light cap or base applications without unnecessary bulk, keeping installation straightforward.
• ZMAX galvanization - offers extra corrosion resistance specifically suited for exterior environments and pressure-treated lumber, where standard coatings break down more quickly.
• Dual-purpose cap and base design - gives installers flexibility to use the same connector at the top or bottom of a post in appropriate top-supported applications such as decks and patio covers.
• Not recommended for non top-supported installations - this connector is not intended for fences or unbraced carports, so buyers can confirm at a glance that it is correctly matched to their supported-post application.

Why This Product

• A stronger alternative to toenailing - by providing a positive mechanical connection, this post cap outperforms angled nailing or screw fastening methods, giving deck builders a more dependable joint at the post-to-beam interface.
• Built for the demands of exterior and treated-wood projects - the ZMAX galvanized finish is specifically formulated to hold up against the accelerated corrosion risk that comes with outdoor exposure and contact with treated lumber, extending the service life of the connection.
• Protects the post itself, not just the joint - by eliminating end-grain nailing and reducing the chance of the post splitting, this cap preserves the post's structural capacity, which matters for the long-term safety of any deck or patio cover.
• Versatile dual-purpose connector from a trusted structural hardware brand - the BC series design works as either a post cap or post base in light applications, reducing the number of separate connectors a builder needs to source for a deck or patio cover project.

Specifications

• MPN: BC46Z
• Nominal Post Size: 4x6
• Gauge: 18
• Coating/Finish: ZMAX
• Install With: 16d common nails or 16d x 2 1/2" joist hanger nails (sold separately)
• Width 1: 3-9/16 in.
• Width 2: 5-1/2 in.
• Length 1: 4-7/8 in.
• Length 2: 2-7/8 in.
• Height 1: 3-1/2 in.
• Height 2: 2-1/2 in.
• Country of Origin: United States

Approved Applications

• Connecting a 4x6 post to a wood deck structure
• Light post cap or base applications in deck and patio cover construction
• Exterior applications requiring enhanced corrosion resistance
• Installations involving pressure-treated lumber

Downloads and Resources

• View Spec Sheet

Frequently Asked Questions

What is the nominal post size compatible with the BC46Z?

The BC46Z is designed for use with a nominal 4x6 post size.

What type of fasteners should be used to install the BC46Z?

Install with 16d common nails or 16d x 2 1/2" joist hanger nails as specified for this post cap.

Why is ZMAX galvanization important for this post cap?

ZMAX galvanization provides extra corrosion resistance, making the BC46Z well suited for exterior environments and applications involving treated wood, where standard coatings may break down more quickly over time.

Can the BC46Z be used for fences or unbraced carports?

No. The BC46Z is not recommended for non top-supported installations such as fences or unbraced carports. It is intended for applications where the post is supported from the top, such as deck and patio cover connections.

Note: Product dimensions and/or screw or bolt holes may differ from picture. Please see item description for specifications.