Simpson #7 x 2-1/4" Trim-Head Screw with Square Drive in Type 305 Stainless Steel is engineered for decking installations where corrosion resistance and a clean, low-profile finish are essential. Designed by Simpson Strong-Tie, this trim-head fastener is built for wood deck boards, docks, and boardwalks - environments where moisture and weathering demand a material that holds up over time. The Type 305 stainless steel construction provides superior resistance to corrosion, making it well-suited for marine settings, high-humidity exposures, and installations near saltwater. The slim trim-style head sits flush with the decking surface, minimizing visual impact and delivering a professional result without the bulk of a standard screw head.

Key Features

• Type 305 Stainless Steel material - resists corrosion in marine, waterfront, and high-moisture environments where standard steel fasteners would degrade prematurely
• Trim head design with 0.230" head diameter - low-profile head sits flush with the decking surface for a clean, unobtrusive finish that blends into the board
• #1 Square drive - provides secure, slip-free engagement during installation, reducing cam-out and making it easier to drive screws consistently
• Type-17 point - self-piercing tip allows for fast starts without pre-drilling in most applications, speeding up installation across the deck surface
• Coarse threads on the lower two-thirds of the shank - draws deck boards tightly down to the joists, creating a firm, secure connection with strong pull-through force
• 2-1/4" length, #7 screw size - sized appropriately for attaching standard deck boards to joists, giving solid penetration without over-driving
• Driver bit included - ready to use out of the package; no need to source a separate bit before starting the job

Why This Product

• Built for decking in demanding environments - Type 305 stainless steel is the right material choice when fastening wood decking on docks, boardwalks, or coastal decks where moisture and salt exposure would cause standard screws to rust and stain the boards
• The trim head keeps the deck surface looking finished - at just 0.230" in diameter, the head is noticeably smaller than a standard bugle or flat head, making it far less visible after installation - an important consideration for high-visibility deck surfaces
• The coarse-thread-plus-Type-17 combination does real work - the self-starting point bites quickly and the aggressive lower-shank threads pull the board down tight to the joist, reducing the need for clamps or repeated passes
• Compatible with Simpson Strong-Tie Quik Drive auto-feed systems in collated versions - if your workflow uses a Quik Drive system, Simpson offers collated square-drive versions of this screw, keeping your fastener sourcing consistent across the job

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #7
• Length: 2-1/4 in.
• Head Type: Trim Head
• Head Diameter: 0.230 in.
• Drive Type: #1 Square
• Thread Type: Coarse Threads
• Point Type: Type-17 Point
• Material: Type 305 Stainless Steel
• Finish: Type 305 Stainless Steel
• Approx. Count Per Lb.: 138
• Country of Origin: Taiwan

Available Pack Options

• S07225FB1: 1 LB - includes Driver bit included; replacement bit part number: BIT1S-2-R2
• S07225FB5: 5 LB - includes Driver bit included; replacement bit part number: BIT1S-2-R2
• S07225FBB: 3000 Pk - includes Driver bit included; replacement bit part number: BIT1S-2-R2

Approved Applications

• Decks - Deck Boards Wood
• Dock and Boardwalk

Frequently Asked Questions

Why is predrilling recommended near board ends when using these screws?

Predrilling near board ends helps prevent the wood from splitting as the screw is driven in. The aggressive coarse threads on the lower two-thirds of the shank are designed to pull the board tightly to the joist, which generates significant lateral pressure - particularly close to the end grain where wood is most prone to splitting. A pilot hole reduces that risk while still allowing the threads to grab firmly.

What is the difference between a trim head and a standard bugle head for decking?

A trim head has a smaller diameter - this screw's head measures just 0.230 in. - compared to a standard bugle or flat head. That smaller footprint means the head is far less visible once driven, producing a cleaner surface appearance. It is especially useful on higher-visibility deck surfaces where minimizing the look of fasteners is a priority.

Is this screw compatible with the Simpson Strong-Tie Quik Drive auto-feed system?

This particular version is designed for hand-drive applications using the included #1 square driver bit. Simpson Strong-Tie does offer collated square-drive versions of this trim-head screw specifically for use with the Simpson Strong-Tie Quik Drive auto-feed screw driving systems - with and without painted heads.

What is a Type-17 point and why does it matter for deck fastening?

A Type-17 point is a self-piercing tip design that cuts into the wood fiber as the screw is driven, rather than simply pushing wood aside. This allows for fast starts without requiring pre-drilling on most deck board applications, saving time across the full deck surface and keeping the installation moving efficiently.