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The Simpson Strong-Tie HTT4 Hold Down Strap delivers outstanding strength and reliability for high-load timber-to-concrete or timber-to-masonry connections. Its long vertical leg allows for optimal fastener placement, maintaining compliance with fastener spacing standards while enabling high-tension resistance in structural applications.
High-Tensile PerformanceEngineered to withstand significant uplift forces in timber framing, particularly in wind or seismic-prone areas.
Unique Multi-Ply Seat DesignFormed from a single steel plate, the seat enhances the connection strength at the concrete or masonry anchorage point.
Z275 Pre-Galvanised Steel ConstructionDurable and corrosion-resistant for long-term use in both internal and sheltered external applications.
Versatile Use in Existing or New BuildsCompatible with retrofits and new structural installations, offering flexibility across construction stages.
Timber structures subjected to high uplift or tension forces
Timber floor joists anchored to masonry or concrete walls
Bracing elements in wall or column-to-foundation connections
Material: Z275 pre-galvanised mild steel
Thickness: 2.8mm
Hole Pattern – Flange A:
18 x Ø4.7mm holes
1 x Ø21mm hole (Flange B for M16 bolt)
For best performance, use with US50/50/8 washer.
Single Stud – 1.2mm Thickness
Back-to-Back Stud – 1.2mm Thickness
Anchor Bolt Diameter: Ø16mm
Fasteners must be installed as specified to achieve rated capacities
Deflection measured between anchor bolt and strap under load
Always consult a qualified engineer for appropriate anchor type, embedment, and configuration
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