The Simpson LPC4Z ZMAX Adjustable Post Cap is an 18-gauge steel connector designed to create a strong, reliable connection between a 4x or 6x beam and a post. Its adjustable, universal design makes it equally at home in new construction and retrofit post-and-beam applications, and its ZMAX galvanized coating delivers enhanced corrosion resistance for exterior environments and structures built with treated lumber. Whether you are framing a deck, pergola, or structural support system, this post cap provides a mechanically superior alternative to angled nailing or end-grain fastening.

Key Features

• Adjustable design - accommodates variation in post and beam positioning, giving you greater connection versatility on the job site
• Universal design eliminates rights and lefts - always installed in pairs, so any two units work together without sorting or special ordering of handed versions
• Stronger than angled nailing or screw fastening - eliminates nailing into end grain, resulting in a more structurally sound and code-acceptable connection
• Can be installed after beams are in place - makes retrofit and repair of existing post-and-beam connections straightforward without dismantling the structure
• Compatible with nominal 4x or 6x lumber - a single connector model covers two common framing dimensions, reducing the number of SKUs you need to stock
• 18-gauge steel construction - provides the strength and rigidity required for structural post-to-beam connections in demanding applications
• ZMAX galvanized coating - offers extra corrosion resistance for exterior applications and direct contact with pressure-treated wood, helping the connector hold up over time

Why This Product

• Retrofit-ready without rebuilding - the adjustable design allows this post cap to be fitted after beams have already been set, so contractors and DIYers can strengthen or repair an existing structure without tearing it apart
• A genuinely stronger connection - by eliminating end-grain nailing and angled fastening, this connector transfers load more efficiently through the post-to-beam joint, which is the core reason post caps exist in structural framing
• Built for exterior and treated-lumber environments - ZMAX galvanization goes beyond standard zinc coating to resist the accelerated corrosion that occurs with modern treated wood chemicals and prolonged moisture exposure, making this cap a sound long-term investment for outdoor structures
• One versatile connector for two lumber sizes - compatibility with both nominal 4x and 6x framing members means this single adjustable cap covers a wide range of deck, pergola, and structural framing scenarios without requiring separate hardware

Specifications

• Model Number: LPC4Z
• Gauge: 18
• Coating/Finish: ZMAX
• Member Size: 4x or 6x
• Install With: 10d common nails or #9 x 1-1/2 in. Strong-Drive SD screws (sold separately)
• Width: 3-9/16 in.
• Length: 3-1/2 in.
• Country of Origin: United States

Approved Applications

• New construction post-to-beam connections using 4x or 6x lumber
• Retrofit installations on existing post-and-beam structures
• Exterior applications where exposure to moisture or treated wood requires enhanced corrosion resistance
• Structural support upgrades where angled nailing or end-grain fastening is not sufficient

Frequently Asked Questions

What lumber sizes is the LPC4Z compatible with?

The LPC4Z is designed for use with nominal 4x or 6x lumber, providing a versatile connection between a 4x or 6x beam and a post.

Can this post cap be installed on an existing structure, or is it only for new construction?

The LPC4Z is suitable for both new construction and retrofit applications. Its adjustable design allows it to be installed after beams have already been put in place, making it an ideal solution for upgrading or repairing existing connections.

Why must the LPC4Z always be installed in pairs?

Installing the LPC4Z in pairs ensures a balanced, structurally sound connection on both sides of the post and beam. The universal design eliminates the need for separate right-hand and left-hand versions, so any two units of the same model can be used together.

What fasteners should be used with the LPC4Z?

The LPC4Z should be installed with 10d common nails or #9 x 1-1/2 in. Strong-Drive SD screws for a proper and code-compliant connection.

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