Simpson Trim-Head Screw, #7 x 3", Type 305 Stainless Steel, #1 Square Drive by Simpson Strong-Tie is engineered for wood decking and boardwalk installations where a clean, low-profile finish and lasting corrosion resistance are both essential. The trim-style head sits flush with the decking surface, minimizing visual disruption while the Type 305 stainless steel construction provides reliable protection against rust and corrosion in marine, waterfront, and high-moisture outdoor environments. Whether you're fastening deck boards to joists or securing planks on a dock, this screw delivers the holding power and refined appearance that demanding exterior applications require.

Key Features

• Type 305 Stainless Steel material - delivers superior corrosion resistance for high-exposure settings, marine environments, and installations alongside PVC or composite decking where moisture contact is constant.
• Trim-style head (0.230" diameter) - sits low and flush against the decking surface for a clean, unobtrusive finish that reduces the visual footprint of each fastener.
• #1 Square drive - provides secure, slip-free bit engagement during installation, reducing cam-out and improving control for faster, cleaner driving.
• Type-17 cutting point - self-starts quickly in wood without pre-drilling in field applications, speeding up installation and reducing prep time.
• Coarse threads on the lower two-thirds of the shank - draw deck boards tightly and securely down to the joists, creating a firm, stable connection with strong pull-through resistance.
• Driver bit included in each package - gets you started immediately without sourcing a separate bit; replacement bit part number BIT1S-2-R2 is available if needed.

Why This Product

• Built for wet and coastal conditions - Type 305 stainless steel construction stands up to the moisture, salt air, and corrosive elements that degrade standard fasteners in dock, boardwalk, and waterfront deck applications.
• Leaves a professional, finished look - the small-diameter trim head blends into the deck surface rather than standing out, making it the right choice when aesthetics matter as much as holding strength.
• Fast and controlled installation - the combination of a Type-17 self-starting point and a square drive that resists cam-out means faster fastening with less frustration, whether hand-driving or using an auto-feed system.
• Strong, lasting board-to-joist connection - coarse threads covering approximately two-thirds of the shank pull deck boards firmly down to framing, preventing gaps and board movement over time.

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 305 Stainless Steel
• Finish: Type 305 Stainless Steel
• Approx. Count per Lb: 98
• Country of Origin: Taiwan

Available Pack Options

• S07300FB1: 1 LB - includes Driver bit included; replacement bit part number: BIT1S-2-R2
• S07300FB5: 5 LB - includes Driver bit included; replacement bit part number: BIT1S-2-R2
• S07300FBB: 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 predrilling recommended near board ends?

Predrilling near board ends helps prevent wood splitting when driving screws close to the edge of a board. While the Type-17 point allows for fast starts in field applications, the edge of a deck board has less material surrounding the fastener and is more prone to splitting under driving pressure - especially in hardwoods or dense composite materials.

What is the difference between the trim head and a standard bugle or flat head screw?

The trim-style head on this screw has a smaller diameter (0.230 in.) compared to a standard bugle or flat head, which means it sits lower and less visibly against the decking surface. This produces a cleaner, more finished look - particularly desirable on deck and boardwalk applications where aesthetics matter.

Can this screw be used with an auto-feed screw driving system?

Simpson Strong-Tie also offers collated square-drive versions of the trim-head screw specifically designed for use with Simpson Strong-Tie Quik Drive auto-feed screw driving systems. The individual screw described here is suited for hand-drive applications using the included driver bit.

What does the Type-17 point do and why does it matter?

The Type-17 point features a notched, cutting tip that bores into wood fibers rather than pushing them aside, allowing the screw to start quickly and drive more smoothly without pre-boring a pilot hole in most field situations. This reduces installation time and minimizes the risk of wood distortion at the entry point.