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Strong-Drive® SDWS™ TIMBER Screw (Exterior Grade) 

Strong-Drive® Exterior Wood Screws

This product's information may differ depending on the category of use. You are currently viewing details related to Strong-Drive® Exterior Wood Screws. You can also view product information related to the category: Fasteners for the Timber Drive™ System

The Strong-Drive SDWS Timber screw is designed to provide an easy-to-install, high-strength alternative to through-bolting and traditional lag screws. This screw is ideal for the contractor and do-it-yourselfer alike. It is code listed in IAPMO UES ER-192 and meets 2018 and 2021 IRC® and IBC® code requirements for most common wood framing applications.

Key Features

  • Bold thread design provides superior holding power
  • SawTooth® point ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications
  • Underhead nibs allow for head to drive flush to surface with reduced splintering
  • Large washer head provides a large bearing area
  • Size identification on all SDWS screw heads
  • 6-lobe T40 drive provides positive engagement that makes the screw easy to drive and improves bit life (replacement driver bit — BIT40T-134-R2)
  • Double-barrier coating provides corrosion resistance equivalent to hot-dip galvanization, making it suitable for certain exterior and preservative-treated wood applications, as described in the evaluation report

Applications

  • Structural wood-to-wood/engineered including ledgers; mass timber connections including CLT wall-to-wall, floor-to-floor, surface splines and lap joints

Product Includes

  • Retail and mini-bulk packs include one 6-lobe, T40 driver bit; bulk packs include two driver bits (BIT40T-134-R2)

Patent Information

  • US Patents 9,523,383; 11,181,138

Related Links

Catalog Pages

Related Literature

Product Information Table

Fastener Production Information and Stuff & Things
New products
Model No. Coating/Material Length (in.) Head Diameter (in.) Shank Diameter (in.) Drive Type Head Type Thread Length (in.) Point Type Color Packaging Qty.
SDWS221000DB Double-Barrier Coating 10 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 250
SDWS221000DB-R12 Double-Barrier Coating 10 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 12
SDWS221000DB-R50 Double-Barrier Coating 10 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 50
SDWS221000DB-RP1 Double-Barrier Coating 10 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 1
SDWS22300DB Double-Barrier Coating 3 0.760 0.220 T40 6-Lobe Washer Head 1 1/2 SawTooth® Point Tan 950
SDWS22300DBMB Double-Barrier Coating 3 0.760 0.220 T40 6-Lobe Washer Head 1 1/2 SawTooth® Point Tan 250
SDWS22300DB-R12 Double-Barrier Coating 3 0.760 0.220 T40 6-Lobe Washer Head 1 1/2 SawTooth® Point Tan 12
SDWS22300DB-R50 Double-Barrier Coating 3 0.760 0.220 T40 6-Lobe Washer Head 1 1/2 SawTooth® Point Tan 50
SDWS22300DB-RP1 Double-Barrier Coating 3 0.760 0.220 T40 6-Lobe Washer Head 1 1/2 SawTooth® Point Tan 1
SDWS22400DB Double-Barrier Coating 4 0.760 0.220 T40 6-Lobe Washer Head 2 3/8 SawTooth® Point Tan 600
SDWS22400DBMB Double-Barrier Coating 4 0.760 0.220 T40 6-Lobe Washer Head 2 3/8 SawTooth® Point Tan 250
SDWS22400DB-R12 Double-Barrier Coating 4 0.760 0.220 T40 6-Lobe Washer Head 2 3/8 SawTooth® Point Tan 12
SDWS22400DB-R50 Double-Barrier Coating 4 0.760 0.220 T40 6-Lobe Washer Head 2 3/8 SawTooth® Point Tan 50
SDWS22400DB-RP1 Double-Barrier Coating 4 0.760 0.220 T40 6-Lobe Washer Head 2 3/8 SawTooth® Point Tan 1
SDWS22500DB Double-Barrier Coating 5 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 600
SDWS22500DBMB Double-Barrier Coating 5 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 250
SDWS22500DB-R12 Double-Barrier Coating 5 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 12
SDWS22500DB-R50 Double-Barrier Coating 5 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 50
SDWS22500DB-RP1 Double-Barrier Coating 5 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 1
SDWS22600DB Double-Barrier Coating 6 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 500
SDWS22600DBMB Double-Barrier Coating 6 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 250
SDWS22600DB-R12 Double-Barrier Coating 6 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 12
SDWS22600DB-R50 Double-Barrier Coating 6 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 50
SDWS22600DB-RP1 Double-Barrier Coating 6 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 1
SDWS22800DB Double-Barrier Coating 8 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 400
SDWS22800DBMB Double-Barrier Coating 8 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 250
SDWS22800DB-R12 Double-Barrier Coating 8 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 12
SDWS22800DB-R50 Double-Barrier Coating 8 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 50
SDWS22800DB-RP1 Double-Barrier Coating 8 0.760 0.220 T40 6-Lobe Washer Head 3 SawTooth® Point Tan 1

Product Information Table

Model No. Length (in.) Drive Type Head Diameter (in.) Head Type Thread Length Shank Diameter (in.) Coating/Material Packaging Quantity
SDWS221000DB 10 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 250
SDWS221000DB-R50 10 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 50
SDWS221000DBRC12 10 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 12
SDWS22300DB 3 T-40 6-Lobe 0.75 Low Profile Head 1 1/2 0.220 Double-Barrier Coating 950
SDWS22300DBMB 3 T-40 6-Lobe 0.75 Low Profile Head 1 1/2 0.220 Double-Barrier Coating 250
SDWS22300DB-R50 3 T-40 6-Lobe 0.75 Low Profile Head 1 1/2 0.220 Double-Barrier Coating 50
SDWS22300DB-RC12 3 T-40 6-Lobe 0.75 Low Profile Head 1 1/2 0.220 Double-Barrier Coating 12
SDWS22400DB 4 T-40 6-Lobe 0.75 Low Profile Head 2 3/8 0.220 Double-Barrier Coating 600
SDWS22400DBMB 4 T-40 6-Lobe 0.75 Low Profile Head 2 3/8 0.220 Double-Barrier Coating 250
SDWS22400DB-R50 4 T-40 6-Lobe 0.75 Low Profile Head 2 3/8 0.220 Double-Barrier Coating 50
SDWS22400DB-RC12 4 T-40 6-Lobe 0.75 Low Profile Head 2 3/8 0.220 Double-Barrier Coating 12
SDWS22500DB 5 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 600
SDWS22500DBMB 5 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 250
SDWS22500DB-R50 5 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 50
SDWS22500DB-RC12 5 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 12
SDWS22600DB 6 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 500
SDWS22600DBMB 6 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 250
SDWS22600DB-R50 6 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 50
SDWS22600DB-RC12 6 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 12
SDWS22800DB 8 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 400
SDWS22800DBMB 8 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 250
SDWS22800DB-R50 8 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 50
SDWS22800DB-RC12 8 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 Double-Barrier Coating 12
    These coated fasteners possess a level of corrosion resistance that makes them suitable for use in some exterior and corrosive environments and with some preservative-treated woods. For applications in higher-exposure applications, consider type-300 series stainless-steel fasteners for superior corrosion resistance. See additional important information before selecting a fastener for a specific application.

Load Tables

SDWS Timber Screw (Exterior Grade) — Allowable Shear Loads — Douglas Fir–Larch and Southern Pine Lumber

See footnotes below.

SDWS Timber Screw (Exterior Grade) — Allowable Shear Loads — Spruce-Pine-Fir and Hem-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.

SDWS Timber Screw (Exterior Grade) Spacing Requirements

  1. For axial loading only, use the following minimum dimensions: end distance = 3 1/4", edge distance = 1 3/8", spacing parallel to grain = 2 1/4", spacing perpendicular to grain = 1 3/8".
SDWS Timber Screw Spacing Requirements

SDWS Timber Screw (Exterior Grade) — Reference Allowable Withdrawal Loads — Douglas Fir–Larch, Southern Pine, Spruce-Pine-Fir and Hem-Fir Lumber

  1. The tabulated reference withdrawal design value, W, is in pounds per inch of the thread penetration into the side grain of the main member.
  2. 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.
  3. The tabulated reference withdrawal design values, W and Wmax, are shown at a CD = 1.6. For end-grain withdrawal, Ceg = 0.65. Tabulated values must be multiplied by all applicable adjustment factors from the NDS as referenced in the IBC or IRC.
  4. Embedded thread length is that portion held in the main member including the screw tip.
  5. Values are based on the lesser of withdrawal from the main member or pull-through of a 1 1/2" side member.
  6. For in-service moisture content greater than 19%, use CM = 0.7.

SDWS Timber Screw (Exterior Grade) — 2021 and 2018 IRC Compliant Spacing for a Sawn Lumber Ledger to Rim Board with One or Two Layers of 5/8" Gypsum Board

  1. 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.
  2. Fastener spacings are based on the lesser of single fastener ICC-ES AC233 testing of the Strong-Drive SDWS screw with a safety factor of 5.0 or ledger assembly testing based on ICC-ES AC13 with a factor of safety of 5.0. Spacing does not include NDS wet service factor adjustment.
  3. Multiple ledger plies shall be fastened together per code independent of the SDWS screws.
  4. SDWS screw spacing values are equivalent to 2021 /2018 IRC Table R507.9.1.3(1) and 2012 /2015 IRC Table R507.2. The table also provides SDWS screw spacing for a wider range of materials commonly used for rim boards, and an alternate loading condition as required by some jurisdictions.
  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 5/32" drill bit.
  6. The design installation permits a wood structural panel (WSP) interlayer in addition to one or two layers of gypsum board. If present, the WSP shall be a maximum of 1/2" thick, adjacent to the framing and fastened directly to the framing per the code.
  7. Gypsum board must be attached as required per the building code.
  8. Visit the Drawing Finder for additional ledger fastening detail sheets and load tables in DWG, PDF or DXF format.

See the Fastening Systems Technical Guide and refer to the Alphabetical Index for additional load tables, technical data and installation instructions for the Strong-Drive® SDWS Timber screw.

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT