Simpson Strong Tie AC4Z Twin Post Cap Z-max 4x4

Product Description

The SIMPSON STRONG TIE AC4Z is a twin post cap designed to connect 4x4 wood members at right angles with a secure, repeatable connection. Fabricated from 18-gauge Z-Max galvanized steel, this cap is built to resist corrosion in exposed and treated-lumber environments. The design eliminates the need to drive fasteners into end grain, which preserves wood integrity and simplifies installation. Structural contractors, framers, and experienced DIYers use the AC4Z where post-to-beam or post-to-header connections require a clean, code-compliant transition without field fabrication.

The AC4Z is suited for residential and light commercial wood framing applications where 4x4 posts meet horizontal members at 90-degree angles. Typical installations include deck framing, pergola construction, fencing structures, and covered walkways. The Z-Max coating makes it compatible with ACQ, CA, and other treated lumber formulations that accelerate corrosion on standard galvanized hardware. Nail placement is guided by pre-punched holes that direct fasteners into the face grain rather than the end grain of the post member.

Key Features

• 18-gauge Z-Max galvanized steel construction for corrosion resistance with treated lumber
• Engineered for 4x4 wood post connections at right angles
• Eliminates end-grain nailing to preserve structural wood integrity
• Pre-punched nail holes guide proper fastener placement
• Sold in a package of 20 units (unit of measure: EA)

Compatibility

Designed as an OEM-style structural connector for 4x4 nominal wood post members in residential and light commercial framing applications.

Installation Notes

Installation should be performed by a qualified framer or contractor in accordance with applicable local building codes and the ICC IBC or IRC as adopted in the jurisdiction. Power down any electrical systems in the work area before beginning structural modifications. Use only the fastener type and quantity specified on the connector label or in the published load table to achieve rated capacity. Do not substitute fastener sizes or reduce nail count, as this directly affects the published load values for the connector.

Technical Specifications

• Material: 18-gauge Z-Max galvanized steel
• Post Size: 4x4
• Package Quantity: 20 EA
• Weight: 10 pounds (package)

Standard Information

• Brand: SIMPSON STRONG TIE
• Manufacturer Part Number: AC4Z