Simpson HELI37900A Heli-Tie 3/8 in. x 9 in. Helical Wall Tie by Simpson Strong-Tie is a stainless-steel helical wall tie engineered to anchor building façades to structural members or to stabilize brick walls. The helical design allows the tie to be driven quickly and easily into a predrilled pilot hole - or embedded into mortar joints in new construction - to provide a mechanical connection between a masonry façade and its backup material. As it is driven, the fins of the tie undercut the masonry to provide an expansion-free anchorage that withstands both tension and compression loads. Heli-Tie wall ties perform in concrete and masonry as well as wood and steel studs.

Key Features

• Installs quickly and easily - with the rotohammer in hammer mode, the tie installs faster than competitive products
• Provides an inconspicuous repair that preserves the appearance of the building; after installation, the tie is countersunk up to 1/2 in. below the surface, allowing the tie location to be patched
• Larger core diameter provides higher torsional capacity, resulting in less deflection due to "uncoiling" under load
• Fractionally sized anchor - no metric drill bits required
• Installed using a proprietary setting tool with an SDS-plus shank rotohammer to drive and countersink the tie
• Corrosion-resistant Type 304 Stainless Steel construction for long-lasting service life
• Compatible with concrete, masonry, wood, and steel stud backup materials

Specifications

• MPN: HELI37900A
• Brand: Simpson Strong-Tie
• Diameter: 3/8 in.
• Length: 9 in.
• Material: Type 304 Stainless Steel
• Finish: Type 304 Stainless Steel
• Required Drill Bit Diameter: 7/32 in. or 1/4 in.
• Installation Tool: HELITOOL37A Heli-Tie fastener installation tool
• Packaging: Packs of 50 and Cartons of 400
• Country of Origin: GB

Approved Applications

• Anchoring building façades to structural members such as concrete block
• Stabilizing existing brick walls
• Remedial masonry repair and façade tie-back to backup structure
• New construction installation by embedding into mortar joints
• Use in concrete and masonry substrates
• Use with wood and steel stud backup materials

Frequently Asked Questions

How is the Heli-Tie helical wall tie installed?

The Heli-Tie wall tie is installed into a predrilled pilot hole using a proprietary setting tool - the HELITOOL37A - with an SDS-plus shank rotohammer. With the rotohammer in hammer mode, the tie drives and countersinks quickly and easily into the substrate. For new construction, the tie can also be embedded directly into mortar joints.

What drill bit size is required to install the HELI37900A?

A 7/32 in. or 1/4 in. drill bit is required to create the pilot hole for the HELI37900A Heli-Tie. Because this is a fractionally sized anchor, no metric drill bits are needed.

What makes the Heli-Tie anchorage expansion-free?

As the Heli-Tie is driven into the predrilled hole, the fins of the tie undercut the surrounding masonry. This undercutting action creates a mechanical connection that provides an expansion-free anchorage capable of withstanding both tension and compression loads without stressing the surrounding masonry material.

Will the Heli-Tie be visible after installation?

No. After installation, the tie is countersunk up to 1/2 in. below the surface of the masonry. This allows the tie location to be patched, providing an inconspicuous repair that preserves the appearance of the building.

Note: Product dimensions may differ from picture. Please see the item description above for specifications.