The Simpson F07T225TDB is a #7 x 2-1/4" self-drilling siding screw engineered for reliable fastening of wood siding, wood panels, and metal trim to steel studs. Constructed from Type 410 stainless steel, this screw can be hardened through heat treatment, giving it the ability to drill through metal substrates. Featuring a low-profile trim head, a #3 drill point, and a #1 square drive, it delivers consistent performance in demanding siding installations. Each order includes a high-value 4,000-piece pack, making it ideal for large-scale projects requiring a dependable, purpose-built fastener.

Key Features

• Trim Head: Low-profile 0.230" head diameter sits flush and clean against siding surfaces for a finished appearance.
• #3 Drill Point: Self-drilling tip eliminates the need for pre-drilling, penetrating steel studs efficiently and saving labor time.
• #1 Square Drive: Provides excellent bit engagement and reduced cam-out during high-volume installation (compatible replacement bit: model BIT1S-2-R2).
• Type 410 Stainless Steel: Heat-treatable material that achieves the hardness required to drill through metal; note that Type 410 does not offer the same level of corrosion resistance as Type 316 or Type 305 stainless steel.
• 19 TPI Threading: Coarse thread pattern designed for secure engagement in wood and light-gauge steel applications.
• 4,000-Piece Packaging: High-quantity pack supports continuous workflow on large siding and panel installation projects.

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
• Country of Origin: Taiwan

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.