The Simpson MSTI48 48" 12-Gauge Galvanized Medium Strap Tie is a high-capacity steel tension strap built to reinforce structural connections across a broad range of demanding applications. Engineered by Simpson Strong-Tie from 12-gauge steel with a G90 zinc galvanized finish, this 48-inch strap is suited for use on wood I-joists and for vertical applications on composite wood products where applicable. A staggered nail pattern combined with 3-inch nail spacing works to minimize wood splitting during installation, so contractors and builders can work with confidence on everything from light repairs to heavy-duty framing projects. Versatile enough to be applied on the wide or narrow face of lumber, this strap tie delivers straightforward, dependable performance wherever structural tension resistance is needed.

Key Features

• High-capacity steel tension strap - delivers the load-bearing strength needed for wood I-joist connections and vertical composite wood product applications, reducing the need for multiple reinforcing components.
• Staggered nail pattern - distributes fastener placement across the strap to reduce stress concentration, helping preserve the integrity of the wood throughout installation.
• 3-inch nail spacing - provides consistent fastener intervals that minimize the chance of splitting the wood, making installation more reliable on both dimensional lumber and engineered wood products.
• 12-gauge steel construction - provides the structural rigidity required for heavy-duty tension applications while keeping the strap manageable and easy to position on site.
• G90 zinc galvanized finish - offers a durable corrosion-resistant coating that helps extend the service life of the strap in environments where moisture exposure is a concern.
• 2-1/16-inch width - sized to work cleanly on both the wide and narrow face of lumber without overhanging, giving installers flexibility across different connection configurations.
• Compatible with 10d x 1-1/2 in. nails or #9 x 1-1/2 in. Strong-Drive SD screws - supports common fastening methods already used on job sites, so no specialty hardware is required to achieve a code-ready connection.

Why This Product

• Engineered to protect the wood, not just hold it - the combination of a staggered nail pattern and 3-inch nail spacing is specifically designed to reduce splitting risk, which means fewer callbacks and cleaner installations on I-joists and composite wood products alike.
• Built for versatility across connection types - this tension strap works on the wide or narrow face of lumber, handles vertical composite wood applications, and is suited for both light repair work and heavy-duty structural projects, so one product covers a wide range of job site needs.
• Corrosion resistance built into the finish - the G90 zinc galvanized coating provides a meaningful layer of protection against moisture-driven corrosion, making this strap a dependable long-term choice in conditions where uncoated steel would degrade prematurely.
• Backed by a trusted structural connector brand - Simpson Strong-Tie straps and plates are recognized for joining and reinforcing joints with simple, versatile solutions, and the MSTI48 reflects that same design philosophy with a product made in the United States.

Specifications

• Model Number: MSTI48
• Length: 48 in.
• Width: 2-1/16 in.
• Gauge: 12
• Thickness: 97 mil
• Coating/Finish: Zinc Galvanized, G90
• Install With: 10d x 1-1/2 in. nails or #9 x 1-1/2 in. Strong-Drive SD screws (sold separately)
• Country of Origin: United States

Approved Applications

• Wood I-joist connections requiring high-capacity steel tension strapping
• Vertical use on composite wood products where applicable
• Diaphragm decking where pneumatic nailing is necessary
• Wood chord open-web trusses where pneumatic nailing is necessary
• Applications designed to resist wind and seismic forces
• Light repairs and heavy-duty structural connection projects
• Wide or narrow face of lumber applications

Frequently Asked Questions

What fasteners should be used to install the MSTI48?

The MSTI48 should be installed with 10d x 1-1/2 in. nails or #9 x 1-1/2 in. Strong-Drive SD screws for optimal performance.

Why does the MSTI48 feature a staggered nail pattern?

The staggered nail pattern is specifically designed to reduce the risk of wood splitting during installation. Combined with the 3 in. nail spacing, it minimizes the chance of splitting the wood when fastening the strap.

What type of corrosion protection does the MSTI48 have?

The MSTI48 is coated with a G90 zinc galvanized finish, which provides extra corrosion resistance and helps extend the service life of the strap in demanding environments.

Can the MSTI48 be used on composite wood products?

Yes. In addition to its use on wood I-joists, the MSTI48 is designed for vertical use on composite wood products where applicable, making it a versatile solution for a wide range of structural connections.

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