• 6" SDWS Simpson Strong-Tie stainless steel timber screw
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SDWS Timber SS Heavy-Duty Screw

SDWS Timber SS Heavy-Duty Screw

Built for builders who work where the elements never rest. The Strong-Drive® SDWS Timber SS fastener is more than hardware - it’s a statement of strength and reliability in the toughest coastal environments. When the project demands endurance, this is the screw that stands up to the sea.

Key Features

  • Type 316 stainless steel for maximum corrosion protection.
  • No predrilling necessary in most applications.
  • Driver bit included (replacement driver bit — BITHEXR516-R1 or BITHEXR12-R1).
  • Can be used in ledger applications.
  • Unique “box” thread design with raised-ridge technology significantly reduces driving torque .
  • Hex-washer head provides large bearing area.

Applications

  • Structural wood-to-wood and engineered-wood connections, including ledger.

Product Includes

$57.00
$57.00
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Wooden deck construction with tools and materials on a wooden platform

Product Info

The Strong-Drive® SDWS Timber SS heavy-duty structural fastener is engineered from Type 316 stainless steel for superior corrosion resistance in harsh, coastal environments.

Its 0.275" diameter shank, SawTooth® point, and large flat washer head provide exceptional holding power and easy installation without the need for predrilling or counterboring.

Designed for maximum performance in applications such as docks, wharves, piers, boardwalks, and ledgers, the SDWS Timber SS delivers dependable strength where it matters most.

Technical Specs

Allowable Shear Loads | Douglas Fir–Larch, Southern Pine Lumber

Table Showing Allowable Shear Loads for Douglas Fir–Larch, Southern Pine Lumber

See footnotes below

Allowable Shear Loads | Hem-Fir, Spruce-Pine-Fir Lumber

Table Showing Allowable Shear Loads for Hem-Fir, Spruce-Pine-Fir Lumber

1. All applications are based on full penetration into the main member. Full penetration is the screw length minus the side member thickness.

2. Allowable loads are shown at the wood load duration factor of CD = 1.0. Loads may be increased for load duration per the building code up to a CD = 1.6. Tabulated values must be multiplied by all applicable adjustment factors per the NDS.

3. For minimum fastener spacing requirements for both side and main members, see the Spacing Requirements Figure and Table below.

4. For in-service moisture content greater than 19%, use CM = 0.7.

5. Loads are based on installation into the side grain of the wood with the screw axis perpendicular to the face of the member.

6.The tabulated reference withdrawal design value, W, is in pounds per inch of the thread penetration into the side grain of the main member.

7. The tabulated reference withdrawal design value, Wmax, is in pounds where the entire thread length must penetrate into the side grain of the main member.

8. Embedded thread length is that portion held in the main member including the screw point.

9. Values are based on the lesser of withdrawal from the main member or pull-through of a 1 1/2" side member.

Screw Spacing Requirements

Table showing Simpson SDWS Timber SS Screw spacing requirements

1. For axial loading only, use the following minimum dimensions: end distance = 4", edge distance = 1 5/8", spacing parallel to grain = 2 7/8", spacing perpendicular to grain = 2".

Diagram showing spacing requirements for Strong Drive SDWS Stainless steel timber screws

2024, 2021 & 2018 IRC Compliant Spacing for a Sawn Lumber Deck Ledger-to-Rim Board

Table with specifications for rim board material and maximum deck joint span under different conditions for IRC compliance

1. SDWS27SS screw spacing values are equivalent to 2024/2021/2018 IRC Table R507.9.1.3(1) and 2015 IRC Table R507.2. The table also provides SDWS27SS screw spacing for a wider range of materials commonly used for rim board, and an alternate loading condition as required by some jurisdictions.

2. Solid-sawn rim board shall be spruce-pine-fir, hem-fir, Douglas fir–larch, or southern pine species. Ledger shall be hem-fir, Douglas fir–larch, or southern pine species.

3. Fastener spacings are based on the lesser of single fastener ICCES AC233 testing of the Strong-Drive SDWS27SS screw with a safety factor of 5.0 or ICC-ES AC13 assembly testing with a factor of safety of 5.0. Spacing includes NDS wet service factor adjustment.

4. Multiple ledger plies shall be fastened together per code independent of the SDWS screws.

5. Screws shall be placed 1.5" to 2" from the top and bottom of the ledger or rim board with 3" minimum and 6" maximum vertical distance between fasteners with horizontal on-center spacing per the table. End screws shall be located 6" from the end and at 1.5" to 2" from the bottom of the ledger. For screws located at least 2" but less than 6" from the end, use 50% of the load per screw and 50% of the table spacing between the end screw and the adjacent screw, and for screws located between 2" and 4" from the end, predrill using a 3/16" drill bit.

6. Structural sheathing between the ledger and rim board shall be a maximum of 1/2" thick and fastened per code.