Simpson Strong-Tie Internal Flange Face Fix Hanger SAI

Heavy-Duty Timber-to-Timber Hanger with Internal Flange Design

The Simpson Strong-Tie SAI Series is a heavy-duty internal flange face fix joist hanger designed for use in timber-to-timber connections where enhanced structural capacity is required. Suitable for solid sawn timber joists and purlins, the SAI hanger combines a robust design with a clean profile, ideal for concealed or tight-fitting applications.

Key Features

• Internal Flange Configuration
  The flanges are located inside the joist seat, providing a flush, clean appearance that reduces obstruction in confined or finished spaces.

• Heavy-Duty Performance
  Engineered to deliver high load capacity, the SAI range is ideal for demanding timber framing conditions such as truss supports, floor beams, or purlins.

• Minimum Width of 91mm
  The SAI range is manufactured with a minimum joist width of 91mm. For narrower timber members, consider the IUC concealed flange hanger.

• Pre-Galvanised Finish
  Constructed from pre-galvanised mild steel for enhanced corrosion resistance in dry, internal structural environments.

• Fast and Simple Installation
  Compatible with square twist nails, the SAI hanger supports quick face fixing without complex alignment or assembly requirements.

Design Considerations

• Joist Depth Coverage
  The hanger depth must be at least 60% of the carried joist depth to prevent rotation. If not, additional lateral restraint must be applied at the top of the joist.

• Not for Bolted Use
  The SAI series is not recommended for bolted applications. For bolted connections, refer to the SAE series.

• For Timber or Steel Headers
  Although primarily designed for timber-to-timber connections, the SAI hanger can also be fixed to steel or engineered wood headers, provided correct fasteners are used.

Material Specification

Specification	Detail
Product Code	SAI Series
Material	Pre-galvanised mild steel
Flange Type	Internal (concealed)
Minimum Joist Width	91 mm
Fixing Method	Full or partial nailing (square twist nails)
Application Type	Face fix

 

Product Details

Images

Full nailing

Partial Nailing

Suitable Applications

• Solid sawn timber joist-to-beam connections

• Purlin hangers in roof and floor assemblies

• Engineered timber to timber joints in residential and light commercial builds

• Concealed connections in finished interiors or where flange visibility is limited

Advantages

• Internal flange design avoids interference with adjacent members or hardware

• Fast, secure nailing simplifies on-site construction

• Clean finish ideal for exposed timber work

• Engineered strength for reliable load transfer in heavy-duty applications

Installation Guidance

1. Position hanger on the face of the supporting timber member.

2. Fix using square twist nails through all designated holes, as per the recommended nailing schedule.

3. Ensure hanger depth covers at least 60% of the supported joist; otherwise, install top-side lateral restraint.