The Simpson HUC66SS HUC Stainless-Steel Face-Mount Concealed-Flange Joist Hanger is a heavy-duty connector engineered by Simpson for structures requiring additional strength and safety factors. Built from 14-gauge stainless steel, it connects 6x6 wood joists to wood, masonry, and concrete headers while keeping header flanges concealed for cleaner visible lines in exposed framing conditions. Its stainless-steel construction delivers extra corrosion resistance, making it a dependable solution for exterior builds and assemblies involving treated lumber.

Key Features

• Concealed header flanges - tuck behind the header rather than showing on the face, resulting in cleaner aesthetics in exposed or architectural framing applications
• Stainless-steel construction - provides extra corrosion resistance for exterior environments and treated-wood applications where standard steel would degrade prematurely
• 14-gauge steel - delivers the heavy-duty load capacity needed for structures with elevated strength and safety requirements
• Extra optional triangle holes - allow additional fasteners to be added when higher load values are needed for demanding structural conditions
• Compatible with wood, masonry, and concrete headers - gives builders flexible installation options across a wide range of framing and substrate conditions
• Tested, load rated, and code compliant - provides the documented performance data and regulatory assurance required on permitted construction projects
• 5-1/2 in. seat width sized for 6x6 lumber - ensures a precise, stable fit that properly transfers joist loads to the header without shimming or adjustment

Why This Product

• Built for demanding structural applications - the HUC series is specifically designed for structures requiring additional strength and safety factors, making it appropriate where standard-duty hangers are not sufficient for the load or code requirement
• Stainless steel protects long-term structural integrity - in exterior conditions or where treated lumber is used, stainless-steel hardware resists the accelerated corrosion that can compromise standard connectors over time, supporting the durability of the overall assembly
• Concealed flanges suit exposed framing without added finishing work - where joists and headers remain visible, the concealed-flange design eliminates the visual clutter of exposed side plates, meeting both structural and aesthetic goals in one hanger
• Optional triangle holes add load flexibility - rather than being locked into a single load value, builders can engage additional fastener holes to meet higher load demands, giving this hanger adaptability across varied project requirements

Specifications

• MPN: HUC66SS
• Material: Stainless Steel
• Finish: Stainless Steel
• Gauge: 14
• Member Size: 6x6
• Height: 4-3/16 in.
• Width: 5-1/2 in.
• Seat Depth: 2-1/2 in.
• Country of Origin: United States
• Install With: (8-12) 0.162 in. x 3-1/2 in. ring-shank nails in the header and (4-6) 0.162 in. x 3-1/2 in. ring-shank nails in the joist; stainless-steel fasteners required (sold separately)

Approved Applications

• Connecting 6x6 wood joists to wood headers
• Connecting 6x6 wood joists to masonry headers
• Connecting 6x6 wood joists to concrete headers
• Exterior applications requiring elevated corrosion resistance
• Structures using treated lumber requiring compatible stainless-steel hardware
• Exposed framing conditions where concealed flanges provide cleaner aesthetics

Options

• Contact us for Configurable Options and Special orders

Frequently Asked Questions

Why is stainless steel specified for this hanger?

Stainless steel offers extra corrosion resistance for exterior and treated-wood applications. When used with treated lumber or in outdoor environments, stainless-steel fasteners are also required to maintain compatibility and structural integrity.

What fasteners are required to install the HUC66SS?

Installation requires (8-12) 0.162 in. x 3-1/2 in. ring-shank nails in the header and (4-6) 0.162 in. x 3-1/2 in. ring-shank nails in the joist. Stainless-steel fasteners are required.

What does "concealed-flange" mean on this hanger?

The concealed header flanges wrap behind the header rather than being visible on its face, providing cleaner visible lines in exposed conditions where the framing will remain visible in the finished structure.

Is the HUC66SS tested and code compliant?

Yes. HUC-series hangers are tested, load rated and code compliant, making them suitable for use in projects requiring documented structural performance and adherence to building code requirements.

Note: Product dimensions and/or nail holes may differ from picture. Please see item description and spec sheet for specifications.