The Simpson Heli-Tie 3/8 in. x 18 in. Helical Wall Tie is a Type 304 stainless steel helical tie engineered to anchor building facades to structural members and 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 during new construction - forming a mechanical connection between a masonry facade and its backup material. As it is driven, the fins of the tie undercut the masonry to deliver an expansion-free anchorage that resists both tension and compression loads. Compatible with concrete, masonry, wood stud, and steel stud backup systems, this helical masonry tie is installed using the HELITOOL37A Heli-Tie fastener installation tool with an SDS-plus shank rotohammer.

Key Features

• Rotohammer-driven installation in hammer mode - the tie seats faster than competitive products, reducing labor time on facade anchoring and masonry repair projects.
• Countersinks up to 1/2 in. below the surface after installation - the tie location can be patched for a clean, inconspicuous finish that preserves the appearance of the building.
• Larger core diameter with higher torsional capacity - minimizes deflection caused by "uncoiling" under load, maintaining a reliable mechanical connection over time.
• Fractionally sized 3/8 in. diameter anchor requiring a 7/32 in. or 1/4 in. drill bit - standard imperial drill bits work throughout the job, eliminating the need for metric tooling on the job site.
• Type 304 stainless steel construction - delivers long-term corrosion resistance in exterior facade and masonry wall tie applications where moisture exposure is a concern.
• Performs in concrete, masonry, wood studs, and steel studs - a single tie solution covers a broad range of substrate combinations for both new construction and retrofit repair work.

Why This Product

• Built for retrofit and new construction alike - the helical wall tie installs into a predrilled pilot hole for masonry facade repair or embeds directly into mortar joints during new construction, making it a versatile choice across project types.
• Expansion-free anchorage protects surrounding masonry - because the fins undercut the masonry as the tie is driven rather than expanding outward, the anchorage method avoids stress cracking in the surrounding material, a meaningful advantage in restoration and facade stabilization work.
• Discreet finish with no visible hardware - countersinking the tie up to 1/2 in. below the surface allows the installation point to be patched, keeping the facade looking intact without exposed fasteners or surface damage.
• No specialty tooling required beyond a standard rotohammer - installation relies on the HELITOOL37A setting tool paired with an SDS-plus shank rotohammer that most masonry crews already have on hand, and the fractionally sized anchor means no metric drill bits are needed.

Specifications

• MPN: HELI371800A
• Brand: Simpson Strong-Tie
• Diameter: 3/8 in.
• Length: 18 in.
• Material: Type 304 Stainless Steel
• Finish: Type 304 Stainless Steel
• Required Drill Bit Diameter: 7/32 in. or 1/4 in.
• Packaging: Packs of 50 and Cartons of 200
• Country of Origin: United Kingdom

Approved Applications

• Anchoring building façades to structural members
• Stabilizing brick walls
• Retrofit repair of masonry façades via predrilled pilot holes
• New construction installation by embedding into mortar joints
• Use in concrete and masonry substrates
• Use with wood and steel stud backup systems

Frequently Asked Questions

What tool is required to install the HELI371800A Heli-Tie?

The Heli-Tie wall tie is installed using the HELITOOL37A Heli-Tie fastener installation tool with an SDS-plus shank rotohammer. The rotohammer is used in hammer mode to drive and countersink the tie into the predrilled pilot hole.

What size pilot hole does the HELI371800A require?

The HELI371800A Heli-Tie requires a predrilled pilot hole using either a 7/32 in. or 1/4 in. drill bit. No metric drill bits are needed, as this is a fractionally sized anchor.

What substrates are compatible with the Heli-Tie helical wall tie?

Heli-Tie wall ties perform in concrete and masonry as well as wood and steel studs, making them suitable for a wide range of façade anchoring and wall stabilization applications.

How does the Heli-Tie provide a discreet installation finish?

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.