Product Description
The Simpson MIT3520 Top-Flange I-Joist Hanger for 2-5/16 in. x 20 in. Engineered Wood from Simpson is purpose-built to support standard 90 deg. connections of I-joists to headers, delivering maximum down loads while keeping fastener counts to a minimum. Designed to be installed before the joist is set in place, this 16-gauge galvanized hanger features a Funnel Flange design that simplifies member placement and positive-angle nailing to protect engineered wood flanges during installation - making it a dependable, cost-effective choice for engineered wood framing projects.
Key Features
- Positive-angle nailing (PAN) - minimizes splitting of the I-joist flanges and allows nailing from a better angle, saving time on the job without compromising connection integrity
- Nail hole material is not removed with PAN - preserves the structural integrity of the hanger and maintains a stronger, more reliable fastening point
- Funnel Flange design - guides the joist into position more easily, reducing installation effort and improving accuracy when setting engineered lumber members
- Optional triangle nail holes for increased uplift capacity - gives installers flexibility to upgrade the connection where higher uplift loads are a concern (note: optional uplift nailing requires properly-secured web stiffeners)
- Optional PAT fastening for steel headers - extends the hanger's versatility to steel framing applications without requiring a different connector
- 16-gauge steel construction - provides the structural strength needed to handle demanding engineered wood framing loads in residential and commercial applications
- Zinc Galvanized, G90 finish - delivers extra corrosion resistance to help the connector hold up in moisture-exposed framing environments over the long term
- Cost-effective alternative to welded hangers - provides a strong, code-compatible 90 deg. I-joist connection at a lower cost than welded connector options
Why This Product
- Engineered specifically for I-joists - unlike generic joist hangers, the MIT3520 is designed around the unique structural characteristics of engineered wood members, with PAN technology that actively prevents flange splitting during nailing
- Fewer fasteners, maximum load capacity - the top-flange design delivers high down-load performance while requiring a minimum number of fasteners, keeping installation efficient without sacrificing structural performance
- Built-in installation advantages - the Funnel Flange simplifies member placement and the positive nailing angle reduces awkward fastening positions, helping crews work faster with fewer errors on framing projects
- Versatile for multiple header types - with optional PAT fastening compatibility for steel headers, this hanger adapts to a wider range of framing conditions, reducing the need to source a separate connector for mixed-material applications
Specifications
- Model Number: MIT3520
- Member Size: 2-5/16 in. x 20 in.
- Gauge: 16
- Coating/Finish: Zinc Galvanized, G90
- Width: 2-3/8 in.
- Height: 20 in.
- Seat Depth: 2-1/2 in.
- Top Flange: 2-5/16 in.
- Installation Fasteners: 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 connections is the Simpson MIT3520 designed for?
The Simpson MIT3520 is designed to support standard 90 deg. connections of I-joists to headers, making it an ideal top-flange hanger for engineered wood framing applications.
What is positive-angle nailing (PAN) and why does it matter?
Positive-angle nailing (PAN) is a design feature specifically created for I-joists that minimizes splitting of the flanges while also permitting time-saving nailing from a better angle. Importantly, with PAN, the nail hole material is not removed, preserving the integrity of the connection.
What fasteners should be used to install the MIT3520?
Install the MIT3520 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 for proper connection performance.
Can the MIT3520 be used with steel headers?
Yes. The MIT3520 features optional fastening with PAT for steel applications and steel header connections, providing added versatility for a range of framing conditions.
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