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Strong-Drive® SDWS TIMBER Screw (Interior Grade) 

Strong-Drive® SDWS TIMBER Screw (Interior Grade)

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The Strong-Drive SDWS Timber (Interior Grade) screw – formerly, the SDWS Log screw – is a structural wood screw available in a variety of lengths and is designed for cross-laminated timber assemblies, mass timber construction, log-home construction, ledgers and general interior applications. These 0.195"- and 0.220"-diameter structural fasteners require less torque to install than comparable fasteners, and the large-diameter washer head pulls members down easily, eliminating the need to use extra washers. It is code listed under IAPMO-UES ER-192 and meets 2015 and 2018 IRC® and IBC® code requirements for several common wood framing applications.

Key Features

  • SawTooth® point ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications
  • Serrated thread reduces splitting and damage
  • Low-profile, large-diameter washer head with nibs provides maximum bearing area and makes countersinking easy
  • 6-lobe, T40 drive provides positive engagement that makes the screw easy to drive and improves bit life (replacement driver bit: BIT40T-134)
  • Size identification on all Simpson Strong-Tie screws
  • US Patent: 9,523,383

Applications

  • Surface splines, lap joints, timber framing, ledgers, log-home construction and general interior applications
  • Testing in a variety of mass timber applications is underway

Product Includes

  • Replacement driver bit: BIT40T-134

Warning

  • Industry studies show that hardened fasteners can experience performance problems in wet and corrosive environments. Accordingly, use this product in dry, interior and noncorrosive environments only.

Related Links

Catalog Pages

Related Literature

Fastening Systems Catalog
C-F-2019
A catalog including new product information as well as any applicable specification and installation instructions for Simpson Strong-Tie® fasteners and Quik Drive® systems.
Catalog
Fastening Systems Technical Guide
C-F-2019TECHSUP
A technical document featuring engineering information for structural fasteners featured in the C-F-2019 Fastening Systems Catalog.
Catalog
Guía técnica de los sistemas de sujeción
C-F-2019TECHSP
Un documento técnico información de ingeniería para los sujetadores estructurales que se incluyen en el C-F-2019SP Catálogo de sistemas de sujeción.
Catalog
Sistemas de sujeción
C-F-2019SP
Catálogo que incluye información sobre productos nuevos y las instrucciones de instalación y especificaciones correspondientes para los sujetadores Simpson Strong-Tie® y los sistemas Quik Drive®.
Catalog
Fastening Systems Technical Supplement for Canada
C-F-2017CANADD
A technical information addendum for Simpson Strong-Tie Fasteners in Canada.
Catalog
Connectors and Fasteners for Mass Timber Construction Catalog
C-C-MASSTIMBER20
A catalog featuring connectors and fasteners for mass timber and CLT construction solutions.
Catalog
Multi-Ply Fastening Solution for 5-Ply Members with the Simpson Strong-Tie® Strong-Drive® TIMBER (Interior Grade) Screw
L-F-5PLYSCREW22
The Simpson Strong-Tie® Strong-Drive® SDWS Log screw (SDWS22800) can be used to attach up to 5 plies of 2x wood members from one side of the built up member.
Engineering Letter
Canadian Factored Lateral Resistances — Strong-Drive® Screws Used for CLT Diaphragms
L-F-CLTBUTLAP21
Simpson Strong-Tie evaluated the SDWC15600, SDWS22400DB, SDWS22600DB, SDWS19600 and SDWV13400 screws for use in cross-laminated timber (CLT) butt-joint and half-lap diaphragm connections.
Engineering Letter

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 Type Thread Length Point Type Color Packaging Qty.
SDWS19600 E-coat® Electrocoating 6 0.640 0.195 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 250
SDWS19600-R50 E-coat® Electrocoating 6 0.640 0.195 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 50
SDWS19600-RP1 E-coat® Electrocoating 6 0.640 0.195 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 1
SDWS19712 E-coat® Electrocoating 7 1/2 0.640 0.195 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 250
SDWS19712-R50 E-coat® Electrocoating 7 1/2 0.640 0.195 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 50
SDWS19712-RP1 E-coat® Electrocoating 7 1/2 0.640 0.195 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 1
SDWS221000 E-coat® Electrocoating 10 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 250
SDWS221000-R50 E-coat® Electrocoating 10 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 50
SDWS221000-RP1 E-coat® Electrocoating 10 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 1
SDWS221100 E-coat® Electrocoating 11 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 250
SDWS221100-R50 E-coat® Electrocoating 11 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 50
SDWS221100-RP1 E-coat® Electrocoating 11 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 1
SDWS221200 E-coat® Electrocoating 12 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 250
SDWS221200-R50 E-coat® Electrocoating 12 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 50
SDWS221200-RP1 E-coat® Electrocoating 12 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 1
SDWS221500 E-coat® Electrocoating 15 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 200
SDWS221500-R50 E-coat® Electrocoating 15 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 50
SDWS221500-RP1 E-coat® Electrocoating 15 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 1
SDWS22400 E-coat® Electrocoating 4 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/8 SawTooth® Point Black 250
SDWS22400-R50 E-coat® Electrocoating 4 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/8 SawTooth® Point Black 50
SDWS22500 E-coat® Electrocoating 5 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 250
SDWS22500-R50 E-coat® Electrocoating 5 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 50
SDWS22512 E-coat® Electrocoating 5 1/2 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 250
SDWS22512-R50 E-coat® Electrocoating 5 1/2 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 50
SDWS22600 E-coat® Electrocoating 6 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 250
SDWS22600-R50 E-coat® Electrocoating 6 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 50
SDWS22800 E-coat® Electrocoating 8 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 250
SDWS22800-R50 E-coat® Electrocoating 8 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 50
SDWS22800-RP1 E-coat® Electrocoating 8 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 1
SDWS22900 E-coat® Electrocoating 9 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 250
SDWS22900-R50 E-coat® Electrocoating 9 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 50
SDWS22900-RP1 E-coat® Electrocoating 9 0.750 0.220 T40 6-Lobe Low Profile Head Serrated Threads 2 3/4 SawTooth® Point Black 1

Product Information Table

Model No. Length (in.) Drive Type Head Diameter (in.) Head Type Thread Length Shank Diameter (in.) Coating/Material Color Packaging Quantity UPC
SDWS19600 6 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.195 E-Coat™ Electrocoating Black 250 744039512508
SDWS19600-R50 6 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.195 E-Coat™ Electrocoating Black 50 707392875871
SDWS19600-RP1 6 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.195 E-Coat™ Electrocoating Black 1 707392893875
SDWS19712 7 1/2 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.195 E-Coat™ Electrocoating Black 250 744039590902
SDWS19712-R50 7 1/2 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.195 E-Coat™ Electrocoating Black 50 707392247531
SDWS19712-RP1 7 1/2 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.195 E-Coat™ Electrocoating Black 1 707392794448
SDWS221000 10 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 250 744039670109
SDWS221000-R50 10 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 50 707392957997
SDWS221000-RP1 10 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 1 707392827078
SDWS221100 11 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 250 744039379200
SDWS221100-R50 11 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 50 707392494515
SDWS221100-RP1 11 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 1 707392113195
SDWS221200 12 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 250 744039803408
SDWS221200-R50 12 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 50 707392953937
SDWS221200-RP1 12 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 1 707392133889
SDWS221500 15 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 200 744039834907
SDWS221500-R50 15 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 50 707392705765
SDWS221500-RP1 15 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 1 707392244486
SDWS22800 8 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 250 744039565405
SDWS22800-R50 8 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 50 707392450351
SDWS22800-RP1 8 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 1 707392588818
SDWS22900 9 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 250 744039487608
SDWS22900-R50 9 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 50 707392264071
SDWS22900-RP1 9 T-40 6-Lobe 0.75 Low Profile Head 2 3/4 0.220 E-Coat™ Electrocoating Black 1 707392618690

Load Tables

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

 

SDWS Timber (Interior Grade) — Allowable Shear Loads — Spruce-Pine-Fir and Hem-Fir

  1. Design values are based on full fastener embedment and the adjacent members are in contact with each other.
  2. Allowable loads are shown at the wood load duration factor of CD = 1.0. Loads may be increased for load duration up to a CD = 1.6.
  3. Tabulated values must be multiplied by all applicable adjustment factors per the NDS.
  4. Minimum fastener spacing requirements: 6" end distance, 1 7/16" edge distance, 5/8" between staggered rows of fasteners, 4" between non-staggered rows of fasteners and 8" between fasteners in a row.
  5. Loads are for in-service moisture content less than or equal to 19% (CM=1.0).
  6. Loads are based on installation into the side grain of the wood member with the screw axis perpendicular to the face of the wood member.

SDWS Timber (Interior Grade) — 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 must penetrate into the side grain of the main member.
  3. Tabulated reference withdrawal design values (CD=1.0), W and Wmax, 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 point.
  5. Values are based on the lesser of withdrawal from the main member or pull-through of a 1.5" side member.
  6. Loads are for in-service moisture content less than or equal to 19% (CM=1.0).

Wood Species Combinations in the Specific Gravity Range 0.35 to 0.41

Allowable Loads for Strong-Drive SDWS Timber Screws (Interior Grade) with Expanded Specific Gravity Options

Allowable load tables on the following pages provide shear and withdrawal capacities for wood species with an assigned specific gravity of 0.35 to 0.41. Wood species with a specific gravity within this range are provided below.

  1. Specific gravity as assigned in NDS-18 Table 12.3.3A.

SDWS Timber (Interior Grade) — Allowable Lateral Loads in the Specific Gravity Range 0.35 to 0.41

  1. Design values are based on full fastener embedment and the adjacent members are in contact with each other.
  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. Minimum fastener spacing requirements: 6" end distance, 1 7/16" edge distance, 5/8" between staggered rows of fasteners, 4" between non-staggered rows of fasteners and 8" between fasteners in a row.
  4. For in-service moisture content less than or equal to 19% (CM=1.0).
  5. The load tables are based on testing in accordance with ICC-ES AC233, with an applied factor of safety of 5.0.

SDWS Timber (Interior Grade) — Allowable Withdrawal Loads in the Specific Gravity Range 0.35 to 0.41

  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 must penetrate into the side grain of the main member.
  3. Tabulated reference withdrawal design values, W and Wmax, 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 as referenced in the IBC or IRC.
  4. Embedded thread length is that portion held in the main member including the screw point.
  5. Values are based on the lesser of withdrawal from the main member or pull-through of a 1.5" side member.
  6. For in-service moisture content less than or equal to 19% (CM=1.0).
  7. The load tables are based on testing in accordance with ICC-ES AC233, with an applied factor of safety of 5.0.

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT

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