The Simpson BCS ZMAX Galvanized Post Cap for Double 2x Beam, 4x Post by Simpson is engineered to create a secure, positive connection between a double 2x beam and a 4x post in wood deck and patio cover construction. Double-shear nailing between the beam and post distributes load across two shear planes, delivering measurably greater strength than angled nailing or screw fastening alone. Built from 18-gauge steel with a ZMAX galvanized finish, this post cap is designed to hold up in exterior environments and against the corrosive effects of treated lumber, giving builders and homeowners a reliable, long-lasting structural connection.

Key Features

• Positive post-to-beam connection - locks the double 2x beam and 4x post together mechanically, eliminating the movement and uncertainty that come with toe-nailing or screw-only fastening methods
• Double-shear nailing design - spreads load across two shear planes between beam and post, providing added strength that single-shear or angled fastening cannot match
• Reduces post splitting and eliminates end-grain nailing - protects the structural integrity of the post over time, keeping the connection solid throughout the life of the deck or patio cover
• 18-gauge steel construction - provides a sturdy, rigid cap that maintains alignment and supports the structural demands of top-supported post-to-beam installations
• ZMAX galvanized coating - offers extra corrosion resistance purpose-built for exterior and treated-wood applications, where standard galvanization may fall short
• Compatible with 10d common nails or #9 x 1 1/2 in. Strong-Drive SD screws - gives installers flexibility to use the fastener type that suits their workflow while still achieving the rated connection strength
• Not recommended for non top-supported installations - knowing this upfront helps buyers select the right connector for fences, unbraced carports, or similar applications, avoiding costly mistakes

Why This Product

• Stronger than traditional fastening methods - the double-shear nailing configuration between beam and post goes beyond what angled nailing or screw fastening can achieve, making this post cap a smarter structural choice for decks and patio covers where connection integrity matters
• Built for outdoor and treated-wood environments - the ZMAX galvanized finish is specifically formulated to resist the accelerated corrosion caused by treated lumber and prolonged moisture exposure, extending the service life of the connection without added maintenance
• Protects the post itself - by eliminating end-grain nailing and reducing the risk of post splitting, this cap preserves the wood member as well as the metal hardware, supporting a more durable overall structure
• Made in the United States by a trusted structural connector brand - Simpson hardware is a recognized name in structural connectors, and this cap is manufactured domestically to consistent quality standards that contractors and DIYers rely on for code-compliant deck and patio construction

Specifications

• Manufacturer: Simpson Strong-Tie
• MPN: BCS2-2/4Z
• Member Size: Double 2x beam, 4x post
• Gauge: 18
• Coating / Finish: ZMAX
• Width 1: 3-1/8 in.
• Width 2: 3-9/16 in.
• Length 1: 2-7/8 in.
• Length 2: 2-7/8 in.
• Height 1: 2-15/16 in.
• Height 2: 2-15/16 in.
• Install With: 10d common nails or #9 x 1-1/2 in. Strong-Drive SD screws (sold separately)
• Country of Origin: United States

Approved Applications

• Wood deck post-to-beam connections
• Patio cover post-to-beam connections
• Connecting double 2x beams to a 4x post in top-supported structural installations
• Exterior and treated-wood construction environments where corrosion resistance is required

Downloads and Resources

• View Spec Sheet

Frequently Asked Questions

What beam and post sizes does the BCS2-2/4Z fit?

The BCS2-2/4Z is sized for a double 2x beam and a 4x post, providing a secure connection between these two nominal lumber dimensions.

Why is double-shear nailing important in this post cap?

Double-shear nailing between the beam and post distributes load across two shear planes rather than one, delivering added strength compared to standard single-shear connections, angled nailing, or screw fastening alone.

What fasteners should be used to install the BCS2-2/4Z?

The BCS2-2/4Z should be installed with 10d common nails or #9 x 1-1/2 in. Strong-Drive SD screws. Always use all specified fasteners to achieve the rated load capacity.

Is the BCS2-2/4Z suitable for use with pressure-treated lumber or in outdoor environments?

Yes. The ZMAX galvanization on the BCS2-2/4Z offers extra corrosion resistance specifically designed for exterior and treated-wood applications, making it appropriate for outdoor deck and patio cover construction.

Note: Product dimensions and/or nail or screw holes may differ from picture. Not recommended for non top-supported installations (such as fences or unbraced carports).