The Simpson ACH4Z Adjustable Post Cap from Simpson is a heavier-capacity, two-piece structural connector engineered to create a secure, reliable connection between a beam and a post. Designed for both new construction and retrofit applications, this adjustable post cap delivers medium- to high-capacity uplift resistance and accommodates either mid-beam or end-beam connections, making it a versatile solution for decks, pergolas, covered porches, and other load-bearing structures.

Key Features

• Field-bendable flanges for end-beam conditions (bend one time only) - gives installers on-site flexibility to adapt the connector to end-beam layouts without requiring a different product
• Load rated when installed in pairs - ensures your structural assembly is properly engineered for medium- to high-capacity uplift loads when two caps are used together
• Compatible with Strong-Drive SD Connector screws - upgrading fasteners increases allowable loads, giving you options to meet higher design requirements without changing hardware
• 16-gauge steel construction - delivers the heavy-duty strength needed for demanding structural post-to-beam connections in residential and light commercial framing
• ZMAX galvanization - provides extra corrosion resistance specifically suited for exterior applications and contact with treated wood, helping the connector hold up in harsh outdoor environments

Why This Product

• Built for new builds and retrofits alike - the two-piece adjustable design means this post cap installs cleanly in both brand-new framing and existing structures where a replacement or added connection point is needed
• Engineered for high-uplift, high-demand applications - medium- to high-capacity uplift load ratings make this cap suitable for structures that must resist significant wind or seismic forces, not just simple gravity loads
• Corrosion-resistant coating designed for real-world outdoor use - ZMAX galvanization goes beyond standard galvanized coatings to protect against the accelerated corrosion associated with treated lumber and exposed exterior conditions
• Flexible fastening options for optimized performance - the ability to install with either nails or Strong-Drive SD Connector screws lets builders match the fastener to the load requirement and job-site conditions

Specifications

• Model Number: ACH4Z
• Nominal Post Size: 4x
• Post-Cap Inner Width: 3-9/16 in.
• Gauge: 16
• Coating/Finish: ZMAX
• Install With: (40) 0.162 in. x 2-1/2 in. nails or (40) #10 x 2-1/2 in. Strong-Drive SD screws (sold separately)
• Width: 3-9/16 in.
• Length: 6-1/2 in.
• Country of Origin: United States

Frequently Asked Questions

What post size is the ACH4Z designed for?

The ACH4Z is designed for a nominal 4x post size, with a post-cap inner width of 3-9/16 in.

Can the ACH4Z be used for both mid-beam and end-beam connections?

Yes. The ACH4Z allows for either mid-beam or end-beam connections. For end-beam conditions, the flanges can be field bent - however, each flange should be bent one time only.

How are load ratings applied for the ACH4Z?

The ACH4Z is load rated when installed in pairs, making it suitable for medium- to high-capacity uplift load applications.

What type of corrosion resistance does the ACH4Z provide?

The ACH4Z features ZMAX galvanization, which offers extra corrosion resistance specifically suited for exterior and treated-wood applications.