Product Description
The Simpson #7 2-1/4 in. Self-Drilling Siding Screw in Type 410 Stainless Steel is a professional-grade fastener built for attaching wood siding, wood panels, and metal trim directly to steel studs and steel framing. Combining a self-drilling point with a corrosion-resistant stainless steel body, this screw is engineered to handle the demands of exterior and structural cladding work where both holding strength and a clean finished appearance matter.
Key Features
- Type 410 Stainless Steel Construction - Provides the hardness required to drill through metal substrates while offering corrosion resistance suited to siding and trim applications.
- Trim Head Profile - Low-profile head sits flush against siding and panel surfaces, delivering a neat, finished look without the bulk of a standard hex or pan head.
- #3 Drill Point - Self-starting tip penetrates steel studs and framing without pre-drilling, reducing installation steps and keeping work moving efficiently.
- #1 Square Drive - Ensures secure bit engagement and minimizes cam-out during driving, giving installers better control and a more consistent result compared to Phillips-style drives.
- 19 TPI Thread Pitch - Fine thread count is optimized for steel stud fastening, maximizing thread engagement and pull-through resistance in metal framing applications.
- 2/3 Thread Length - Partial threading provides clamping force that pulls the wood siding or panel tight against the steel substrate for a firm, stable connection.
Why This Product
- No Pre-Drilling Required - The #3 drill point allows direct penetration into steel studs, eliminating a time-consuming preparation step and simplifying the fastening process on wood siding and panel installations.
- Built for Metal-to-Wood Fastening - Engineered specifically for attaching wood siding, wood panels, and metal trim to steel framing, so the thread geometry, drive type, and material are all matched to this exact application rather than adapted from a general-purpose screw.
- Cleaner Finished Surface - The trim head's low-profile design minimizes surface protrusion, making it a practical choice wherever the fastener head will remain visible after installation.
- Reliable Drive Performance - The #1 square drive reduces cam-out and bit slippage, which means fewer stripped heads, less rework, and a more controlled installation experience on the job site.
Specifications
- Model Number: F07T225TDC
- Screw Size: #7
- Length: 2-1/4 in.
- Head Diameter: 0.230 in.
- Head Type: Trim Head
- Drive Type: #1 Square
- Thread Length: 2/3
- TPI: 19
- Point Type: #3 Drill Point
- Coating / Material: Type 410 Stainless Steel
- Packaging Quantity: 100
Approved Applications
- Attaching wood siding to steel studs
- Fastening wood panels to steel framing
- Securing metal trim to steel studs
What's Included
- 100 x Simpson #7 2-1/4" Self-Drilling Siding Screws (F07T225TDC)
Note: Product dimensions and/or thread length may differ from picture. Please see item description for specifications.
Frequently Asked Questions
- Do these screws require pre-drilling before installation?
- No. These screws feature a #3 drill point that allows them to penetrate directly through metal studs and framing without the need for pre-drilling, saving time during installation.
- What materials and applications are these screws designed for?
- These screws are engineered for fastening wood siding, wood panels, and metal trim to steel studs. The Type 410 stainless steel construction provides the hardness necessary to drill through metal substrates.
- What drive type and bit are compatible with these screws?
- These screws use a #1 square drive, which provides superior bit engagement and reduced cam-out compared to Phillips-style drives. They are compatible with replacement bit model BIT1S-2-R2.
- What is the thread pitch, and why does it matter for steel stud applications?
- These screws have a 19 TPI (threads per inch) thread pitch, which is optimized for secure, vibration-resistant fastening specifically in steel stud applications.
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