Product Description
The Simpson #7 2-1/4 in. Self-Drilling Siding Screw in Type 410 Stainless Steel is a purpose-built fastener designed for attaching wood siding, wood panels, and metal trim to steel studs and steel framing. Built around a self-drilling design, this screw eliminates the need for pilot holes, making it a practical choice for contractors and builders working through high-volume siding and trim installations where consistent, clean results matter.
Key Features
- Type 410 Stainless Steel Construction - Heat-treatable and hardenable, this material gives the screw the strength needed to drill through metal substrates without sacrificing structural integrity.
- Self-Drilling #3 Drill Point - Penetrates steel studs without a pilot hole, reducing steps in the installation process and keeping work moving efficiently on large siding jobs.
- Low-Profile Trim Head - The compact head sits flush and clean against siding and trim surfaces, delivering a finished appearance that suits exposed fastener applications.
- #1 Square Drive - Provides strong bit engagement and resists cam-out during repetitive, high-speed driving, reducing stripped heads and wasted fasteners on the job.
- 19 TPI Thread with 2/3-Shank Thread Length - Engineered thread geometry pulls material tight against the framing and maintains holding strength in siding and panel applications.
Why This Product
- No Pre-Drilling Required - The #3 self-drilling point bores directly into steel studs, cutting out an entire step from the fastening process and saving meaningful labor time across large-scale installations.
- Designed for Siding and Trim Work - Approved for attaching wood siding to steel studs, fastening wood panels to steel framing, and securing metal trim to steel studs, making this a versatile single-fastener solution for exterior framing projects.
- Heat-Treatable Stainless Steel for Metal Substrate Use - Type 410 stainless steel can be hardened to handle the demands of drilling into steel, something standard stainless fasteners are not built to do.
- Cam-Out Resistant Drive System - The #1 square drive holds the bit securely during installation, which matters most in production environments where screws are driven repeatedly and quickly throughout the workday.
Specifications
- Model Number: F07T225TDB
- 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 of shank
- TPI: 19
- Point Type: Drill Point (#3)
- Coating / Material: Type 410 Stainless Steel
- Packaging Quantity: 4,000 pieces
Approved Applications
- Attaching wood siding to steel studs
- Fastening wood panels to steel framing
- Securing metal trim to steel studs
What's Included
- 4,000 x Simpson #7 x 2-1/4" Self-Drilling Siding Screws, Type 410 Stainless Steel (F07T225TDB)
Frequently Asked Questions
- Do these screws require pre-drilling before installation?
- No. These screws feature a #3 drill point that is self-drilling, meaning they can penetrate steel studs without the need for a pilot hole. This saves labor time and speeds up high-volume siding installations.
- What type of stainless steel are these screws made from, and does it affect corrosion resistance?
- These screws are made from Type 410 stainless steel, which is heat-treatable and can be hardened to drill through metal substrates. However, Type 410 does not offer the same level of corrosion resistance as Type 316 or Type 305 stainless steel, so this should be considered when selecting fasteners for highly corrosive environments.
- What drive type do these screws use, and is there a compatible replacement bit?
- These screws use a #1 square drive, which provides excellent bit engagement and reduces cam-out during high-volume installation. A compatible replacement bit is model BIT1S-2-R2.
- What applications are these screws designed for?
- These screws are engineered for fastening wood siding, wood panels, and metal trim to steel studs. The 4,000-piece pack makes them well suited for large-scale siding and panel installation projects requiring a purpose-built fastener in high quantities.
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