The Simpson SP1Z Stud Plate Tie is a 3-1/2 in. x 5-1/16 in. ZMAX galvanized connector from Simpson engineered specifically for sill-to-stud connections that must resist uplift forces from wind and seismic loads. Angled nail holes promote a positive, high-strength mechanical connection between nominal 2x studs and bottom plates, while the ZMAX coating makes this tie equally at home in demanding exterior and treated-wood environments where standard galvanization falls short. Whether you are building new or reinforcing existing framing in a retrofit project, the SP1Z delivers a code-appropriate stud-to-plate connection in a compact, easy-to-install profile.

Key Features

• Embossments that strengthen the stud-to-plate connection - added rigidity at the connector face transfers load more effectively, giving the joint greater resistance to racking and uplift.
• Designed to resist wind and seismic forces - purpose-engineered load path keeps studs anchored to plates under the lateral and uplift demands of high-wind and earthquake-prone regions.
• Usable before or after installation, including in retrofit applications - flexible installation sequence lets contractors add or replace ties in existing framing without removing finished assemblies.
• Compatible with nominal 2x stud framing - sized to fit standard dimensional lumber so no special cutting or shimming is required on the job site.
• Made from 20-gauge steel - provides the structural integrity needed for a reliable stud-plate connection while keeping the connector lightweight and easy to handle.
• ZMAX galvanization for extra corrosion resistance - the heavier zinc coating protects against accelerated corrosion in exterior environments and when in contact with treated wood, extending the service life of the connection.

Why This Product

• Built for both sill-to-stud uplift resistance and retrofit flexibility - unlike generic framing hardware, the SP1Z is specifically rated for sill-to-stud connections and can be installed in new construction or added to existing framing, covering a wide range of project scenarios without requiring separate products.
• ZMAX coating addresses a real-world corrosion gap - projects involving pressure-treated lumber or exposed exterior framing demand more than standard galvanized steel; the ZMAX finish on the SP1Z meets that requirement directly, reducing the risk of premature connector failure.
• Positive mechanical connection through angled nail holes - driving a fastener at an angle through the stud into the plate creates a mechanical interlock that plain-face connectors cannot match, translating directly into stronger uplift performance at each tied location.
• Simpson engineering behind wind and seismic applications - the SP1Z is part of Simpson's stud-plate tie series, a product line developed specifically around wind and seismic resistance, giving builders and inspectors confidence that the connector is purpose-designed rather than repurposed from a general-use bracket.

Specifications

• Model Number: SP1Z
• Width: 3-1/2 in.
• Length: 5-1/16 in.
• Gauge: 20
• Coating/Finish: ZMAX
• Member Size: Nominal 2x
• Country of Origin: United States

Approved Applications

• Sill-to-stud connections to resist uplift
• Exterior applications requiring enhanced corrosion resistance
• Treated-wood applications where standard galvanization is insufficient
• Retrofit installations where connections must be made after initial framing
• Structures requiring resistance to wind and seismic forces

Frequently Asked Questions

What is the difference between the SP1Z and the SP2 stud plate tie?

The SP1 is designed for sill-to-stud connections, while the SP2 is intended for double-top-plate-to-stud connections. Both resist uplift, but they are used at different locations within the wall framing assembly.

What fasteners are required to install the SP1Z?

Install with (10) 0.148 x 3-in. nails. One of the 0.148 in. x 3 in. stud nails is driven at a 45-degree angle through the stud into the plate for a positive connection.

Why choose the ZMAX version of the SP1 stud plate tie?

ZMAX galvanization offers extra corrosion resistance compared to standard galvanized coatings, making the SP1Z the appropriate choice for exterior applications and projects involving treated wood where standard connectors may be susceptible to accelerated corrosion.

Can the SP1Z be installed in existing construction rather than just new builds?

Yes. The SP1Z can be used before or after installation, including in retrofit applications, making it a versatile solution for upgrading existing stud-to-plate connections to resist wind and seismic forces.