The Simpson Strong-Drive SDWS TIMBER Stainless Steel Screw (0.275" shank x 6" length) by Simpson delivers a high-strength, easy-to-install fastening solution engineered for demanding structural wood connections in coastal and severe corrosion environments. Constructed from Type 316 Stainless Steel, this heavy-duty structural screw resists saltwater, chemicals, and harsh outdoor conditions that would degrade standard fasteners - making it the go-to choice for piers, boardwalks, wharves, docks, and ledger board applications where both strength and long-term corrosion resistance are non-negotiable. As a code-listed alternative to through-bolting and traditional lag screws, the SDWS TIMBER SS simplifies installation for contractors and do-it-yourselfers alike while meeting current building code requirements.

Key Features

• Type 316 Stainless Steel material and finish - provides severe corrosion resistance in saltwater, coastal, and chemically aggressive environments where standard galvanized fasteners are inadequate
• 0.275" shank diameter - heavy-duty shank size delivers the structural load capacity needed for wood-to-wood and engineered-wood framing connections
• 6" length with 3" thread length - deep penetration into receiving members ensures a secure, high-strength mechanical connection without the need for pre-drilling in many applications
• SawTooth point - self-drilling tip bites into wood fibers quickly and cleanly, reducing installation effort and eliminating the need for a pilot hole in typical applications
• T50 6-Lobe drive type - high-torque drive interface reduces cam-out and strip-out during driving, giving installers confident control at full seating depth
• Washer head with 0.650" head diameter - large bearing surface distributes clamping load across a wider area, reducing wood crushing and improving pull-through resistance
• 5 TPI thread - coarse threading is optimized for structural lumber and engineered wood, maximizing withdrawal resistance in each connection
• Code listed under IAPMO UES ER-192, meets 2018 and 2021 IRC and IBC requirements - use with confidence on permitted projects where inspectors require documented code compliance for structural fasteners

Why This Product

• Replaces through-bolts and lag screws in structural applications - the SDWS TIMBER SS is specifically engineered as a high-strength alternative to traditional fastening methods, reducing installation time and labor on structural framing and engineered-wood connections
• Built for the harshest corrosion environments - Type 316 Stainless Steel outperforms standard stainless and galvanized finishes in marine, coastal, and chemically exposed settings, making this screw the appropriate choice for piers, wharves, boardwalks, and waterfront ledgers
• Dual-audience design for professionals and DIYers - the SawTooth self-drilling point, T50 6-Lobe drive, and washer head combine to make installation straightforward without sacrificing structural integrity, whether on a job site or a home project
• Meets current model building codes - code listing under IAPMO UES ER-192 and compliance with 2018 and 2021 IRC and IBC requirements means this fastener can be specified and inspected on permitted construction projects with confidence

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Shank Diameter: 0.275 in.
• Length: 6 in.
• Thread Length: 3 in.
• Head Type: Washer Head
• Head Diameter: 0.650 in.
• Drive Type: T50 6-Lobe
• Point Type: SawTooth Point
• TPI: 5

Available Pack Options

• SDWS27600SS-RC10: 10 Pk - includes one 6-lobe, T-50 driver bit
• SDWS27600SS-R30: 30 Pk - includes one 6-lobe, T-50 driver bit
• SDWS27600SS: 300 Pk - includes two 6-lobe, T-50 driver bits

Approved Applications

• Structural wood-to-wood connections in coastal or severe corrosion environments
• Engineered-wood framing connections exposed to saltwater or chemical corrosion
• Dock and pier construction requiring code-compliant structural fasteners
• Wharves and boardwalks in marine or waterfront settings
• Ledger board connections in exterior and coastal construction
• Common wood framing applications meeting 2018 and 2021 IRC and IBC code requirements

Frequently Asked Questions

Does this screw require a pilot hole before installation?

The SDWS TIMBER SS features a SawTooth point designed for self-drilling entry into wood and engineered-wood materials. In typical structural lumber applications, a pilot hole is not required, which speeds up installation for both contractors and do-it-yourselfers.

What code listings apply to this screw and which building codes does it satisfy?

This screw is code listed under IAPMO UES ER-192 and meets the requirements of the 2018 and 2021 International Residential Code (IRC) and International Building Code (IBC) for several common wood framing and engineered-wood applications. It is suitable for use on permitted projects where structural fastener documentation is required by inspectors.

Why is Type 316 Stainless Steel specified for this screw instead of a standard stainless or galvanized finish?

Type 316 Stainless Steel offers severe corrosion resistance specifically suited for coastal, marine, and chemically aggressive environments - such as docks, wharves, piers, and waterfront boardwalks - where standard galvanized or Type 304 stainless fasteners may not provide adequate long-term performance. The 316 grade is the specified material for this product.

What drive bit is required to install this screw?

This screw uses a T50 6-Lobe drive interface. A T50 Torx-style bit is required for installation. The 6-lobe design helps reduce cam-out and allows high torque to be applied during driving, which is important when seating a heavy-duty structural screw into dense lumber or engineered wood.

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