Simpson #7 x 2-1/4" Trim-Head Screw in Type 316 Stainless Steel by Simpson Strong-Tie is engineered for decking installations where a clean surface finish and long-lasting corrosion resistance are both essential. The low-profile trim-style head sits flush with the deck board surface, minimizing visual disruption while delivering a professional result. Driven by a #1 square drive for slip-free engagement, this fastener is built for wood deck boards, docks, and boardwalks exposed to moisture, salt air, and demanding outdoor conditions. Type 316 stainless steel construction means this screw stands up to saltwater environments and high-exposure coastal applications where standard fasteners would corrode and fail over time.

Key Features

• Type 316 Stainless Steel material - resists corrosion in marine, saltwater, and high-humidity environments, making it suitable for docks, boardwalks, and coastal deck installations where inferior metals would degrade
• Trim-head design with 0.230" head diameter - the low-profile head sits flush at the surface, delivering a clean, understated finish that keeps fasteners from standing out on deck boards
• #1 Square drive - provides secure, slip-free bit engagement during installation, reducing cam-out and driver fatigue on long decking runs
• Type-17 point - designed for fast starts in wood decking, allowing the screw to self-start without pre-drilling in most field conditions, speeding up installation
• Coarse threads on approximately the lower two-thirds of the shank - draw deck boards tightly down to the joists, creating a firm, secure connection with strong pull-through performance
• #7 screw size at 2-1/4" length - sized appropriately for fastening deck boards to framing members, providing sufficient penetration depth for a secure structural hold
• Approximately 138 screws per pound - gives installers a reliable way to estimate material quantities needed for a given decking project area

Why This Product

• Built for demanding outdoor exposure - Type 316 stainless steel goes beyond standard stainless grades in corrosion resistance, making this screw a practical choice for docks, boardwalks, and deck boards in marine or coastal settings where moisture and salt are constant factors.
• Clean surface results without extra finishing steps - the trim-style head design minimizes the fastener's footprint on the deck surface, so installers achieve a polished, finished appearance without countersinking plugs or additional cover work.
• Reduces installation delays caused by cam-out - the #1 square drive holds the bit firmly in the recess, letting installers drive screws quickly and consistently through full decking runs without stopping to reset a slipped bit.
• Draws boards tight to the framing - coarse threads covering the lower two-thirds of the shank actively pull deck boards down to the joists as the screw is driven, reducing gaps and surface movement for a stable, long-lasting deck surface.

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 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Approx. Count Per Lb: 138
• Country of Origin: Taiwan

Available Pack Options

• T07225FB1: 1 LB - includes Driver bit included (replacement bit part number: BIT1S-2-R2)
• T07225FB5: 5 LB - includes Driver bit included (replacement bit part number: BIT1S-2-R2)
• T07225FBB: 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 Type 316 stainless steel recommended for deck and dock fasteners?

Type 316 stainless steel offers superior resistance to corrosion compared to standard stainless grades, particularly in environments exposed to moisture, salt air, and marine conditions. This makes it well-suited for wood deck boards, docks, and boardwalks where fasteners are in continuous contact with the elements.

What is a Type-17 point and why does it matter for decking installation?

A Type-17 point is a self-starting tip designed to cut into wood fibers quickly, allowing the screw to begin driving without requiring a pilot hole in most decking applications. This speeds up installation and reduces setup time when fastening wood deck boards to joists.

What is the purpose of the coarse threads on the lower two-thirds of the shank?

The coarse threads located on approximately the lower two-thirds of the shank are designed to grip the framing member and actively pull the deck board downward as the screw is driven. This draws the board tight to the joist, reducing surface gaps and creating a firm, stable connection.

Is predrilling required when using these trim-head screws near board ends?

Predrilling is recommended when driving screws near the ends of deck boards to help prevent splitting. While the Type-17 point facilitates fast starts in the field, wood at board ends is more prone to splitting under the stress of screw insertion, so a pilot hole in those locations is advisable.