The Simpson MSTA21 21" Medium Strap Tie from Simpson is engineered to resist tension loads in wood-to-wood uplift applications, delivering reliable structural performance where it matters most. Designed specifically for use on the edge of 2x members, this 18-gauge galvanized strap tie features a staggered nail pattern that helps minimize wood splitting during installation - making it a practical, code-conscious choice for floor-to-floor clear span connections in both wind and seismic load conditions.

Key Features

• Load-rated with correct thickness and fastener count - eliminates the guesswork and inconsistency of field-fabricated straps, helping ensure code-compliant performance on every installation
• Increased load ratings for wind and seismic forces - provides confidence that the connection is engineered to handle the demands of structural uplift in high-stress conditions
• Floor-to-floor clear span application - purpose-built for spanning between floor levels, reducing the need for custom or improvised solutions on the job site
• Designed for the edge of 2x members - the geometry fits standard framing lumber precisely, supporting a clean and secure installation without modification
• Staggered nail pattern - helps minimize wood splitting when driving fasteners, protecting the integrity of the lumber and the connection
• G90 zinc galvanized coating - provides extra corrosion resistance, helping the strap maintain structural integrity in moisture-prone environments

Why This Product

• Engineered reliability over field fabrication - unlike a field-fabricated strap, the MSTA21 is load rated with the correct thickness and number of fasteners, so contractors and inspectors can trust the connection meets structural requirements without on-site uncertainty
• Built for uplift and lateral force resistance - with load ratings increased for wind and seismic forces, this strap tie is suited for projects in demanding climates or high-risk zones where structural connections face elevated stress
• Installation-friendly design - the staggered nail pattern reduces the risk of splitting 2x members at the edge, and compatibility with 10d common nails or #9 x 1-1/2 in. Strong-Drive SD screws gives installers flexible fastening options
• Long-term durability in real-world conditions - the G90 galvanized finish adds a meaningful layer of corrosion protection, making this medium strap tie a sound investment for framing applications where moisture exposure is a factor

Specifications

• MPN: MSTA21
• Length: 21 in.
• Width: 1-1/4 in.
• Gauge: 18
• Coating/Finish: Zinc Galvanized, G90
• Member Size: 2x
• Country of Origin: United States

Approved Applications

• Wood-to-wood uplift tension load connections
• Floor-to-floor clear span installations
• Edge of 2x member applications requiring wind and seismic resistance

Frequently Asked Questions

What fasteners should be used to install the MSTA21?

Install with 10d common nails or #9 x 1-1/2 in. Strong-Drive SD screws.

Why choose a load-rated strap tie over a field-fabricated strap?

Unlike field-fabricated straps, the MSTA21 is load rated with the correct thickness and number of fasteners, ensuring consistent, code-compliant performance in structural applications.

What is the benefit of the G90 galvanized coating on the MSTA21?

The G90 zinc galvanized coating provides extra corrosion resistance, helping the strap tie maintain its structural integrity in environments where moisture exposure is a concern.

How does the staggered nail pattern on the MSTA21 help during installation?

The staggered nail pattern is designed to help minimize wood splitting when driving fasteners, allowing for a cleaner, more secure installation on the edge of 2x members.

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