The Simpson #7 3 in. Self-Drilling Siding Screw in Type 410 Stainless Steel is purpose-built for attaching wood siding, wood panels, and metal trim directly to steel studs without the need for a pilot hole. Combining a self-drilling tip, a low-profile trim head, and a corrosion-resistant stainless steel alloy, this fastener is engineered to deliver a clean, finished result on exposed siding and trim installations where both performance and appearance matter.

Key Features

• Type 410 Stainless Steel Construction - A hardenable stainless alloy that resists corrosion while maintaining the hardness needed to drill into steel framing, making it a reliable choice for exterior siding applications.
• Low-Profile Trim Head - Sits flush and discreet against finished surfaces, reducing the need for additional concealment work on exposed siding and trim.
• #3 Drill Point - Self-drills directly into steel studs without pre-drilling, keeping installations fast and reducing labor on the job site.
• #1 Square Drive - Provides strong bit engagement that resists cam-out during driving, giving installers more control and consistency on every fastener.
• Thread Coverage Spanning 2/3 of Shank - Optimized thread length pulls material tight against the framing member for a secure, stable connection.

Why This Product

• No Pre-Drilling Required - The #3 drill point drives directly into steel studs, eliminating a separate step and keeping siding and trim work moving efficiently.
• Built for Exposed Finish Work - The low-profile trim head delivers a neat, unobtrusive appearance on visible siding and trim surfaces, reducing touch-up time after installation.
• Cam-Out Resistance Built In - The #1 square drive holds the bit securely during driving, minimizing stripped heads and wasted fasteners on production-pace jobs.
• Stainless Steel Durability for Demanding Conditions - Type 410 stainless steel pairs corrosion resistance with the structural hardness needed to penetrate steel framing, making these screws well suited for exterior and moisture-exposed environments.

Specifications

• Model Number: F07T300TDC
• Screw Size: #7
• Length: 3 in.
• Head Diameter: 0.230 in.
• Head Type: Trim Head
• Drive Type: #1 Square
• Thread Length: 2/3 of shank
• TPI (Threads Per Inch): 19
• Point Type: Drill Point (#3)
• Material / Coating: Type 410 Stainless Steel
• Packaging Quantity: 100 pieces

Approved Applications

• Attaching wood siding to steel studs
• Fastening wood panels to steel framing members
• Securing metal trim to steel studs

What's Included

• 100 x Simpson #7 x 3" Self-Drilling Siding Screws (F07T300TDC), Type 410 Stainless Steel

Frequently Asked Questions

Do these screws require pre-drilling before installation into steel studs?

No. The F07T300TDC features a #3 drill point that allows the screw to self-drill directly into steel studs without the need for a pilot hole, saving time and labor on the job site.

What type of drive bit does this screw require?

This screw uses a #1 square drive, which provides superior bit engagement and reduces cam-out during installation. It is compatible with replacement bit model BIT1S-2-R2.

What applications is this screw designed for?

The F07T300TDC is engineered for fastening wood siding, wood panels, and metal trim to steel studs. Its low-profile trim head makes it well suited for exposed siding and trim applications where a clean, finished appearance is important.

Why is Type 410 stainless steel used for this screw instead of a softer stainless grade?

Type 410 stainless steel is a hardenable alloy that can be strengthened through heat treatment. This allows the screw to maintain the hardness needed to self-drill through metal framing while still offering the corrosion-resistant properties of stainless steel - a combination that softer stainless grades cannot reliably provide in self-drilling applications.