The Simpson 2 x 4 Deck Post Tie from Simpson Strong-Tie is a purpose-built connector designed to attach 2x4 vertical posts to the outside face of stair stringers, rim joists, or other wood members in deck and stair assemblies. Engineered and tested to perform, this heavy-duty tie is built for both new construction and retrofit applications, offering a faster and more reliable alternative to traditional through-bolting for exterior post connections.

Key Features

• Attaches 2x4 posts to the outside of stair stringers and rim joists - purpose-matched geometry means the connector fits correctly from the start, reducing layout time on deck and stair projects
• Easier installation than through-bolting - simplifies post attachment without the need to drill through multiple members, saving labor on both new builds and retrofit jobs
• 14-gauge steel construction - heavy-gauge material provides the structural rigidity needed for load-bearing post connections in deck and stair assemblies
• ZMAX galvanized finish - delivers extra corrosion resistance beyond standard galvanization, keeping the connector protected in exterior conditions and when in contact with pressure-treated lumber
• Suited for new construction and retrofit applications - versatile enough to work on fresh builds or on existing stringers and rim joists that require a post added after the fact
• Typically installed in pairs - using two connectors per post creates a balanced, secure connection on both sides of the vertical member

Why This Product

• Built specifically for deck and stair post connections - unlike general-purpose hardware, this tie is engineered specifically for attaching 2x4 vertical posts to stringers and rim joists, so the fit and fastener pattern are optimized for that exact task
• ZMAX finish stands up where standard coatings fall short - for exterior framing and pressure-treated wood applications, the extra corrosion resistance of ZMAX galvanization helps the connector hold its integrity over time in harsh conditions
• Faster to install than traditional through-bolt methods - the connector's design eliminates the need for drilling through multiple stacked members, making post attachment more straightforward on both ground-up construction and existing deck retrofits
• A trusted Simpson Strong-Tie engineered product - Simpson Strong-Tie connectors are engineered and tested to perform and manufactured to high quality standards, giving contractors and DIYers confidence in the structural connection

Specifications

• MPN: DPT5Z
• Brand: Simpson Strong-Tie
• Member Size: 2x4
• Gauge: 14
• Finish: ZMAX
• Coating: ZMAX
• Install With: 3/8 in. diameter machine bolts and 10d x 1-1/2 in. nails or #9 x 1-1/2 in. Strong-Drive SD screws
• Country of Origin: United States

Approved Applications

• Attaching 2x4 vertical posts to the outside face of stair stringers on deck and stair assemblies
• Connecting 2x4 posts to rim joists in deck construction
• New construction deck and stair post installations
• Retrofit construction where existing stringers or rim joists require post attachment
• Exterior and pressure-treated wood applications requiring enhanced corrosion resistance

Frequently Asked Questions

What size post does the DPT5Z Deck Post Tie fit?

The DPT5Z is designed for a nominal 2x4 post size, connecting a 2x4 vertical post to the outside of stair stringers, rim joists, or other wood members.

What fasteners are required to install the DPT5Z?

Install with 3/8 in. diameter machine bolts and 10d x 1-1/2 in. nails or #9 x 1-1/2 in. Strong-Drive SD screws. Note that lag screws are not a listed substitute for machine bolts.

Why is the ZMAX finish important for this connector?

The ZMAX galvanization offers extra corrosion resistance, making the DPT5Z well suited for exterior applications and use with pressure-treated wood, where standard galvanized finishes may be insufficient.

How many DPT5Z connectors are typically needed per post?

The DPT5Z is typically installed in pairs, so two connectors are generally used per post installation to provide secure and balanced attachment.