Simpson #8 x 9/16" Self-Drilling Wire-Lath Modified Truss-Head Screw in Type 410 Stainless Steel is a precision-engineered metal fastener from Simpson Strong-Tie, purpose-built for attaching metal lath to studs and securing corrugated siding panels to steel studs. Designed to deliver strength and superior performance in steel and other metal applications, these self-drilling screws eliminate the need for predrilling - saving time on residential, agricultural, and commercial projects. The modified truss head profile, tapping threads, and drill point work together to create fast, reliable connections in demanding metal-to-metal assemblies.

Key Features

• Type 410 Stainless Steel construction - provides hardness through heat treatment, giving the screw the ability to drill through metal for secure, long-lasting connections in steel framing applications.
• Self-drilling drill point - penetrates metal quickly without requiring a pilot hole, reducing installation steps and speeding up production in metal lath and siding panel work.
• #2 Phillips drive - compatible with standard Phillips bits and screw guns, making these fasteners easy to drive with tools already on the job site.
• Modified Truss Head with 0.42 in. head diameter - the wide, low-profile head distributes clamping force over a broader surface area, reducing the risk of pull-through in metal lath and thin panel materials.
• 18 TPI tapping threads - engage steel studs and metal substrates firmly, creating strong thread engagement that resists loosening under load or vibration.
• 9/16 in. length with 0.148 in. max grip length - sized specifically for single to multiple metal lath layer applications, keeping fastener protrusion controlled and consistent.
• #8 screw size - a proven, versatile diameter for wire lath fastening that balances holding power with ease of installation across a range of metal gauges.

Why This Product

• Purpose-built for wire lath and corrugated siding installations - the combination of a drill point, tapping threads, and modified truss head is engineered specifically for the demands of fastening metal lath to studs and attaching corrugated panels to steel framing, reducing the guesswork of selecting a general-purpose screw.
• No predrilling required - the self-drilling point penetrates metal directly, cutting installation time and eliminating a separate drilling step on steel stud framing projects.
• Stainless steel durability in metal applications - Type 410 stainless steel can be hardened through heat treatment, giving it the structural strength needed to drive through metal substrates where standard carbon steel screws may fail or cam out.
• Trusted Simpson Strong-Tie engineering - designed to meet the requirements of residential, agricultural, and commercial construction projects, providing consistent performance across a wide range of metal framing applications.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #8
• Length: 9/16 in.
• Head Type: Modified Truss Head
• Head Diameter: 0.42 in.
• Drive Type: #2 Phillips
• Point Type: Drill Point
• Thread Type: Tapping Threads
• TPI: 18
• Max. Grip Length: 0.148 in.
• Material: Type 410 Stainless Steel
• Country of Origin: Taiwan

Available Pack Options

• F08T056KDC: 100 Pk
• F08T056KDM: 1000 Pk
• F08T056KDB: 8000 Pk

Approved Applications

• Fastening metal lath to steel studs
• Attaching corrugated siding panels to steel studs

Frequently Asked Questions

Do these screws require a pilot hole before installation?

No. These screws feature a self-drilling drill point that penetrates metal directly, eliminating the need for predrilling and speeding up installation on steel stud framing and metal lath projects.

What type of drive bit is needed to install these screws?

These screws use a #2 Phillips drive, which is compatible with standard Phillips screwdriver bits and most power screw guns commonly found on job sites.

How does Type 410 Stainless Steel perform in metal fastening applications?

Type 410 stainless steel can be hardened through heat treatment, which gives it the structural hardness needed to drill through metal substrates. It is well-suited for metal lath and steel stud applications. Note that Type 410 does not offer the same level of corrosion resistance as Type 316 or Type 305 stainless steel, so it should be selected with the intended environment in mind.

What is the purpose of the modified truss head on this screw?

The modified truss head has a wide, low-profile shape with a 0.42 in. head diameter. This broader bearing surface distributes clamping force over a larger area, helping to reduce pull-through in thin materials like metal lath and corrugated siding panels.

Note: Product dimensions and/or thread length may differ from picture. Please see item description for specifications.