The Simpson Strong-Drive SDWS TIMBER Stainless Steel Screw is a heavy-duty structural fastener engineered as a high-strength, easy-to-install alternative to through-bolting and traditional lag screws. Built from Type 316 stainless steel, this 0.275-in. diameter by 12-in. screw delivers reliable corrosion resistance even in severe environments - making it a proven choice for structural wood-to-wood connections on docks, piers, boardwalks, wharves, and coastal or salt-air applications where moisture and corrosive elements are a constant concern. Code listed under IAPMO UES ER-192, it meets 2018 and 2021 IRC and IBC code requirements for several common wood framing and engineered-wood applications, giving contractors and do-it-yourselfers alike the confidence of a compliant, performance-verified fastener.

Key Features

• No predrilling, no counterboring, no heavy-duty equipment needed - installation is fast and straightforward, reducing labor time and tool requirements on the job site.
• SawTooth point - designed for fast starts and reduced driving torque without predrilling, so you can drive screws quickly and consistently through dense timber.
• Heavy-duty 0.275-in. diameter shank - provides the structural strength and durability required for demanding load-bearing wood connections.
• Greater withdrawal resistance versus spikes - delivers a more secure, longer-lasting connection in structural timber applications than traditional spike fasteners.
• Large 0.650-in. diameter flat washer head with nibs - maximizes load-bearing surface area and seats flush with the material surface for a clean, professional finish.
• Deep T50, 6-lobe recess - reduces cam-outs during installation, keeping the driver bit engaged and protecting both the screw head and surrounding material.
• Mid-shaft knurl - aids in torque reduction during driving, making installation smoother and reducing strain on tools and the installer.
• Type 316 stainless steel construction - provides corrosion resistance even in severe conditions, including marine, coastal, dock, and high-moisture environments where inferior fasteners would degrade prematurely.
• Includes a T-50 driver bit - so you have the correct tool ready to go without sourcing additional accessories before work can begin.

Why This Product

• Built for the harshest environments - Type 316 stainless steel is specifically suited for marine, coastal, salt-air, and other severely corrosive conditions, making this screw a dependable long-term fastener for docks, piers, boardwalks, and similar structures where standard fasteners fail.
• Eliminates the extra prep work of traditional lag screws - the SawTooth point and tool-free installation design mean no predrilling, no counterboring, and no heavy equipment, translating directly into faster project completion and lower labor costs.
• Code-compliant for structural applications - listed under IAPMO UES ER-192 and meeting 2018 and 2021 IRC and IBC requirements, this screw satisfies inspection requirements for wood framing and engineered-wood connections without the guesswork.
• Engineering details that reduce on-site frustration - the deep 6-lobe T50 recess minimizes cam-outs, the mid-shaft knurl eases driving torque, and the included driver bit means you can get to work immediately, making this a practical choice for both professional contractors and serious do-it-yourselfers.

Specifications

• MPN: SDWS271200SS-R30
• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Length: 12 in.
• Shank Diameter: 0.275 in.
• Head Type: Washer Head
• Head Diameter: 0.650 in.
• Drive Type: T50 6-Lobe
• Thread Length: 3 in.
• TPI: 5
• Point Type: SawTooth Point
• Code Listing: IAPMO UES ER-192; meets 2018 and 2021 IRC and IBC code requirements

Approved Applications

• Fastening Wood-to-Wood - structural wood-to-wood and engineered-wood connections in coastal or severe corrosion environments, including piers, boardwalks, wharves, docks, and ledgers

What's Included

Each pack contains (30) TIMBER Stainless Steel Screws, one 6-lobe, T-50 driver bit.

Frequently Asked Questions

Does this screw require predrilling before installation?

No. The SawTooth point is specifically designed for fast starts and reduced driving torque, allowing for installation without predrilling, counterboring, or heavy-duty equipment.

Why is Type 316 stainless steel used for this screw?

Type 316 stainless steel provides corrosion resistance even in severe conditions, making these screws well suited for demanding environments such as coastal installations, docks, wharves, piers, boardwalks, and ledgers where exposure to moisture and corrosive elements is a concern.

What drive tool is required to install this screw?

This screw uses a deep T50, 6-lobe recess drive. A T-50 driver bit is included with the purchase to help reduce cam-outs during installation.

Is this screw compliant with current building codes?

Yes. The Strong-Drive SDWS TIMBER Screw is code listed under IAPMO UES ER-192 and meets 2018 and 2021 IRC and IBC code requirements for several common wood framing and engineered-wood applications.

Note: Product dimensions and/or thread length may differ from picture. Please see the item specifications above for exact measurements.