Simpson Trim-Head Screw, #7 x 3", 316 Stainless Steel, Square Drive by Simpson Strong-Tie is engineered for wood deck boards, docks, and boardwalk installations where a clean surface appearance and long-term corrosion resistance are both essential. The low-profile trim-style head sits nearly flush with the decking surface, minimizing visual distraction while the Type 316 stainless steel construction holds up against saltwater exposure, moisture, and the harsh outdoor conditions found in marine and coastal environments. With a #1 square drive and a Type-17 point, this fastener delivers controlled, slip-free driving and fast starts - making it a reliable choice for professional decking crews and serious DIYers alike.

Key Features

• Type 316 Stainless Steel material - provides superior corrosion resistance in saltwater, marine, and high-humidity environments where standard fasteners would fail prematurely, keeping deck boards secure for the long term.
• Trim-style head (0.230 in. diameter) - the small, low-profile head sits closer to flush with the decking surface compared to standard bugle-head screws, resulting in a cleaner, more finished look on wood and composite deck boards.
• #1 Square drive - delivers secure, slip-free bit engagement during installation, reducing cam-out and driver wear, and helping maintain consistent driving torque across every fastener.
• Type-17 point - the self-drilling tip bites into wood fiber quickly for fast starts without pre-drilling in most field conditions, speeding up the decking installation process.
• Coarse threads on approximately two-thirds of the shank - these threads engage the framing and draw deck boards tightly to joists, creating a firm, rattle-free connection and minimizing board movement over time.
• 3-inch length, #7 screw size - sized appropriately for standard wood deck board fastening, providing adequate penetration depth into framing members for a strong mechanical hold.

Why This Product

• Built for wet and marine environments - Type 316 stainless steel is a step above standard stainless grades in chloride and saltwater resistance, making this screw a dependable choice for docks, boardwalks, and coastal decks where corrosion is a constant challenge.
• Cleaner deck surface aesthetics - the trim-style head design keeps fastener visibility low, which matters on decks and boardwalks where surface appearance is part of the finished project quality.
• Faster, more controlled installation - the combination of a Type-17 self-drilling point and a square drive reduces skipped starts and cam-out, allowing installers to drive screws efficiently and with confidence on every board.
• Strong pull-through for tight board-to-joist connections - coarse threads on the lower shank pull deck boards firmly down onto joists as the screw seats, reducing gaps and board movement without the need for additional clamping during fastening.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #7
• Length: 3 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: 98
• Country of Origin: Taiwan

Available Pack Options

• T07300FB1: 1 LB - includes Driver bit included; replacement bit part number: BIT1S-2-R2
• T07300FB5: 5 LB - includes Driver bit included (replacement bit part number: BIT1S-2-R2)
• T07300FBB: 2000 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 decking and dock applications?

Type 316 stainless steel contains molybdenum, which provides enhanced resistance to chlorides and saltwater compared to standard stainless grades. This makes it well-suited for docks, boardwalks, and coastal deck installations where fasteners are regularly exposed to moisture, salt air, or treated lumber that can accelerate corrosion in lesser materials.

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

A Type-17 point features a notched, self-drilling tip that cuts into wood fiber and evacuates chips as it penetrates, allowing for fast, clean starts without the need to pre-drill. This speeds up installation on deck boards and reduces the risk of surface splitting when driving near board edges, though predrilling is still recommended near board ends.

What does the trim-style head offer compared to a standard bugle head?

The trim-style head has a smaller diameter (0.230 in.) and a lower profile than a standard bugle head, so it sits closer to flush with the decking surface once fully driven. This results in a cleaner appearance on finished deck boards and boardwalk planking where fastener visibility would otherwise detract from the overall look of the installation.

How do the coarse threads on this screw contribute to deck board performance?

Coarse threads run along approximately two-thirds of the shank. As the screw seats, these threads engage the framing below the deck board and draw the board tightly down to the joist. This pull-through action creates a firm, secure connection that minimizes board movement and helps maintain a flat, stable deck surface over time.