The Simpson THAC426 Adjustable Concealed-Flange Truss Hanger is a heavy-duty wood connector engineered by Simpson to support trusses and beams in applications where the height location of the truss must remain field-adjustable. This U-shaped hanger features extra-long, straight straps that give installers the flexibility to position the truss at the correct height on site, while its concealed flanges make it well suited for restricted or confined spaces where standard exposed flanges would not fit. Built from 14-gauge steel with a G90 zinc galvanized finish, this connector is built to hold up in demanding structural framing environments.

Key Features

• Top-flange or face-mount installation compatibility - gives contractors the freedom to choose the installation method that best fits their project conditions without purchasing a separate hanger.
• Extra-long straps for height adjustability - allow the truss height location to be set in the field, reducing the need for pre-planning exact positioning before installation begins.
• Dense nail pattern in the straps - provides more installation options and makes top-flange installation straightforward, even in tight framing situations.
• Min./max. nailing installation options - let installers select the nailing schedule that meets their load requirements, adding versatility across different structural applications.
• Concealed flanges - keep the hanger profile low and unobtrusive, making this connector the right choice for restricted spaces where adjacent framing members leave little clearance.
• 14-gauge steel construction - delivers the structural rigidity and load-bearing capacity required for supporting trusses and beams in wood framing applications.
• G90 zinc galvanized finish - provides corrosion resistance to help the connector maintain its integrity over time in environments where moisture exposure is a concern.

Why This Product

• True field adjustability - the extra-long straight straps let crews dial in the truss height location on site rather than being locked into a fixed position, which saves time and reduces costly framing corrections.
• Two installation methods in one hanger - because the THAC426 supports both top-flange and face-mount approaches, a single connector covers a wider range of jobsite conditions, simplifying procurement and material staging.
• Designed for tight spaces - the concealed-flange design was purpose-built for installations where restricted clearances rule out conventional hangers, making this connector the practical solution when space is at a premium.
• Durable corrosion-resistant finish - the G90 zinc galvanized coating is applied to 14-gauge steel, combining structural strength with long-term protection in wood framing applications exposed to moisture.

Specifications

• Model Number: THAC426
• Brand: Simpson Strong-Tie
• Member Size: 4x26
• Seat Width: 3-5/8 in.
• Hanger Height: 26 in.
• Gauge: 14
• Coating: Zinc Galvanized, G90
• Finish: Zinc Galvanized, G90
• Country of Origin: United States

Approved Applications

• Supporting trusses and beams in wood construction
• Applications where the height location of the truss must be field-adjustable
• Installations in restricted or confined spaces requiring concealed flanges
• Top-flange installation: use (8) 0.162 in. x 3-1/2 in. nails in the header and (6) 0.162 in. x 3-1/2 in. nails in the joist
• Face-mount installation: use (30) 0.162 in. x 3-1/2 in. nails in the header and (6) 0.162 in. x 3-1/2 in. nails in the joist

Frequently Asked Questions

What installation methods are compatible with the THAC426?

The THAC426 supports both top-flange and face-mount installation methods, giving contractors flexibility to choose the approach that best suits their project conditions.

How many nails are required to install the THAC426?

For top-flange installation, use (8) 0.162 in. x 3-1/2 in. nails in the header and (6) 0.162 in. x 3-1/2 in. nails in the joist. For face-mount installation, use (30) 0.162 in. x 3-1/2 in. nails in the header and (6) 0.162 in. x 3-1/2 in. nails in the joist.

Why does the THAC426 feature concealed flanges?

The concealed flanges are specifically designed for applications in restricted spaces where standard exposed flanges would not fit or interfere with adjacent framing members.

What corrosion protection does the THAC426 provide?

The THAC426 is coated with a Zinc Galvanized G90 finish, which provides a high level of corrosion resistance suitable for demanding structural applications.

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