Product Description
The Simpson MIT3518 Top-Flange Joist Hanger for 2-5/16 in. x 18 in. Engineered Wood from Simpson Strong-Tie is built to deliver reliable 90 deg. connections of I-joists to headers in engineered wood framing. Designed to be installed before the joist is set in place, this top-flange hanger simplifies the framing process while providing maximum load capacity with a minimum number of fasteners. The Funnel Flange design makes member placement easier, and the hanger's positive-angle nailing system is specifically engineered to protect I-joist flanges - making it a practical, cost-effective alternative to welded hangers for standard structural connections.
Key Features
- Positive-angle nailing (PAN) for I-joist flange protection - nails are driven at a better angle to minimize splitting of the flanges, saving installation time without compromising structural integrity
- Nail hole material is not removed with PAN - preserves the full strength of the connection point, giving you a more secure fastening in engineered wood applications
- Optional triangle nail holes for increased uplift capacity - when paired with properly-secured web stiffeners, these holes allow the hanger to handle greater uplift forces for more demanding structural requirements
- Funnel Flange design - guides members into position before fastening, reducing placement effort and speeding up the framing workflow
- Optional fastening with PAT for steel applications/header - adds versatility for projects where the header material is steel rather than wood
- 16-gauge steel construction - provides the strength needed to handle maximum down loads in engineered wood framing while keeping the connector lightweight and manageable
- Zinc Galvanized, G90 coating - delivers extra corrosion resistance, extending the service life of the connector in moisture-prone framing environments
- Top-flange installation before joist placement - allows the hanger to be secured to the header first, simplifying alignment and reducing the need for extra hands during installation
Why This Product
- Engineered specifically for I-joist framing - the positive-angle nailing system and Funnel Flange design work together to address the real-world challenges of installing engineered wood joists, protecting flange integrity while keeping the job moving efficiently
- Maximum load capacity with fewer fasteners - the MIT3518 is designed to deliver the highest down loads achievable while requiring a minimum number of fasteners, reducing both material use and installation time on the job site
- Built-in flexibility for varied structural demands - optional triangle nail holes support increased uplift capacity, and optional PAT fastening accommodates steel header applications, making this hanger adaptable across a range of engineered wood framing scenarios
- A cost-effective alternative to welded hangers - for standard 90 deg. I-joist-to-header connections, the MIT3518 delivers comparable performance without the added cost or lead time associated with custom welded connectors
Specifications
- MPN: MIT3518
- Member Size: 2-5/16 in. x 18 in.
- Width: 2-3/8 in.
- Height: 18 in.
- Seat Depth: 2-1/2 in.
- Top Flange: 2-5/16 in.
- Gauge: 16
- Coating/Finish: Zinc Galvanized, G90
- Install With: Install with 0.162 in. x 3-1/2 in. nails in the header and 0.148 in. x 1-1/2 in. nails in the joist (sold separately)
- Country of Origin: United States
Options
- Contact us for Configurable Options and Special orders
Note: Product dimensions may differ from picture. Please see the item description above for specifications.
Frequently Asked Questions
What type of joist connections is the Simpson MIT3518 designed to support?
The Simpson MIT3518 is designed to support 90 deg. connections of I-joists to headers, making it a reliable and cost-effective solution for standard engineered wood framing applications.
What is positive-angle nailing (PAN) and why does it matter for I-joists?
Positive-angle nailing (PAN) is a design feature specifically created for I-joists that minimizes splitting of the flanges while permitting time-saving nailing from a better angle. Importantly, the nail hole material is not removed with PAN, preserving the integrity of the connection.
What nails are required to install the MIT3518?
Install with 0.162 in. x 3-1/2 in. nails in the header and 0.148 in. x 1-1/2 in. nails in the joist.
Does the MIT3518 offer any additional uplift capacity options?
Yes. Optional triangle nail holes may be used for increased uplift capacity; however, optional uplift nailing requires the addition of properly-secured web stiffeners to achieve that enhanced performance.
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