Simpson #8 x 3/4" Wire-Lath Modified Truss-Head Screw in Type 305 Stainless Steel is a special-purpose fastener from Simpson Strong-Tie, engineered specifically to attach wire lath to wood framing. Featuring a broad modified truss head with a 0.420 in. diameter, this stucco and plaster lath screw delivers a generous bearing surface that keeps lath held firmly and evenly against the substrate. Driven with a #2 Phillips and tipped with a Type-17 point for fast, accurate starts, it is an ideal choice for installers who need reliable performance in corrosion-prone exterior environments where stainless steel fasteners are required.

Key Features

• Modified Truss Head (0.420 in. diameter) - provides a larger bearing surface than a standard head, distributing load across wire lath and reducing the chance of pull-through during and after installation.
• Type 305 Stainless Steel material - resists corrosion in outdoor, coastal, and moisture-exposed applications, making it suitable for exterior stucco and lath work where lesser finishes would degrade over time.
• Type-17 Point - self-starting tip cuts into wood quickly without pre-drilling, speeding up installation and reducing installer fatigue on the job site.
• Coarse Thread pattern - bites aggressively into wood substrates, creating a strong mechanical hold that keeps lath secure through settling and seasonal movement.
• #2 Phillips Drive - compatible with standard hand drivers and power drivers, keeping tool requirements simple and consistent across a work crew.
• 3/4 in. length - sized for attaching lath to wood framing without over-penetrating, giving just the right grip depth for thin wood-framed substrates.

Why This Product

• Designed by Simpson Strong-Tie specifically for wire lath attachment, this screw addresses the real-world problem of standard fasteners sinking through or loosening in lath - the modified truss head holds lath flat and secure without tearing through the material.
• The Type 305 Stainless Steel finish makes this a dependable fastener for exterior plastering and stucco systems where exposure to moisture, humidity, and salt air would cause standard steel fasteners to rust and stain the finished surface.
• The combination of a Type-17 self-starting point and coarse threads means faster penetration and a tighter hold in wood framing, reducing the number of drive passes and keeping the work moving efficiently.
• Simpson Strong-Tie specialty fasteners are engineered to help build safer, stronger structures - this screw is not a general-purpose substitute but a purpose-built lath fastener designed for the structural and cosmetic demands of the application.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #8
• Length: 3/4 in.
• Head Type: Modified Truss Head
• Head Diameter: 0.420 in.
• Drive Type: #2 Phillips
• Thread Type: Coarse Threads
• Point Type: Type-17 Point
• Material: Type 305 Stainless Steel
• Finish: Type 305 Stainless Steel
• Country of Origin: Taiwan

Available Pack Options

• S08C075KQC: 100 Pk
• S08C075KQM: 1000 Pk

Approved Applications

• Wire Lath attachment to wood framing

Frequently Asked Questions

Why is a modified truss head used instead of a standard flat or bugle head for wire lath?

The modified truss head has a larger diameter - 0.420 in. - which spreads the clamping load over a wider area of the wire lath. This is important when a larger bearing surface is required for the head, preventing the fastener from pulling through the lath openings and ensuring the lath stays firmly attached to the wood substrate.

Is Type 305 Stainless Steel suitable for exterior and coastal lath applications?

Yes. Type 305 Stainless Steel is the material and finish of these screws, providing corrosion resistance appropriate for exterior plastering and stucco systems where fasteners are exposed to moisture and humidity. This helps protect the integrity of the installation and prevents rust staining on finished surfaces.

What does the Type-17 point do and do I need to pre-drill?

The Type-17 point is a self-starting tip that cuts into wood without requiring a pilot hole. This allows for faster starts and cleaner penetration into wood framing, reducing the need for pre-drilling and keeping the installation process efficient.

What drive tool do I need to install these screws?

These screws use a #2 Phillips drive, which is compatible with standard hand screwdrivers and power drills or drivers fitted with a #2 Phillips bit - a common tool already found on most job sites.