The Simpson #7 1-5/8 in. Self-Drilling Siding Screw in Type 410 Stainless Steel is built for contractors and builders who need a dependable, no-pre-drill fastener for attaching wood siding, wood panels, and metal trim to steel studs. The trim head profile, self-drilling point, and square drive combine to deliver clean, efficient results on high-volume cladding and panel installations where speed and a finished appearance are equally important.

Key Features

• Trim Head Design - The low-profile trim head sits flush against the surface, producing a neat, finished look on siding and panel applications without bulky hardware interrupting the facade.
• #3 Self-Drilling Point - Drives directly into steel studs without pre-drilling, reducing steps in the installation process and keeping cladding projects moving at pace.
• #1 Square Drive - Minimizes cam-out and improves torque transfer during driving, so fasteners seat consistently and bits stay engaged even under sustained use.
• Full Thread Length - Threading runs the full length of the shank, maximizing pull-through resistance and grip in wood-to-steel assemblies.
• Type 410 Stainless Steel Construction - Heat-treatable 410 stainless provides the hardness needed to penetrate metal substrates while offering meaningful corrosion resistance for exterior siding and trim environments.

Why This Product

• Eliminates Pre-Drilling on Steel Framing - The #3 drill point bores through steel studs in a single step, cutting labor time on wood siding and metal trim installations without the need for additional tooling.
• Purpose-Built for Cladding Applications - Sized and threaded specifically for attaching wood siding, wood panels, and metal trim to steel framing, this screw matches the demands of common exterior and interior finish assemblies.
• Reduced Driver Bit Wear and Slippage - The #1 square drive geometry keeps the bit locked during high-torque driving, reducing wear on bits and improving consistency across repetitive fastening tasks.
• Hardened Stainless Steel for Dual-Purpose Performance - Type 410 stainless is heat-treated to achieve the hardness required for self-drilling into metal, while still delivering corrosion resistance suited to exterior trim and siding work.

Specifications

• Model Number: F07T162TDB
• Screw Size: #7
• Length: 1-5/8 in.
• Head Type: Trim Head
• Head Diameter: 0.230 in.
• Drive Type: #1 Square
• Point Type: #3 Drill Point
• Thread Length: Full
• TPI (Threads Per Inch): 19
• Max. Grip Length: 1.169 in.
• Material / Coating: Type 410 Stainless Steel
• Packaging Quantity: 5,000 pieces

Approved Applications

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

What's Included

• 5,000 x Simpson #7 1-5/8" Self-Drilling Siding Screws (Type 410 Stainless Steel)

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

Frequently Asked Questions

Do these screws require pre-drilling before installation?

No. These screws feature a #3 self-drilling drill point that drives directly into steel studs without the need for pre-drilling, speeding up installation on siding and panel projects.

What drive type does this screw use, and is there a compatible replacement bit?

This screw uses a #1 square drive, which minimizes cam-out and improves torque transfer. A compatible replacement bit is available under model number BIT1S-2-R2.

Is Type 410 stainless steel as corrosion resistant as Type 316 or Type 305 stainless steel?

No. While Type 410 stainless steel offers good corrosion resistance and can be hardened through heat treatment - which enables the drill point to penetrate metal substrates - it does not provide the same level of corrosion resistance as Type 316 or Type 305 stainless steel.

What applications are these screws designed for?

These screws are engineered for fastening wood siding, wood panels, and metal trim to steel studs, making them well suited for both residential and commercial cladding applications. The 5,000-piece pack is designed for high-volume siding installations where consistency and holding strength are critical.