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Strong-Drive® SDWS TIMBER Screw

High Strength and Easy Installation for Interior and Exterior Structural Applications

The SDWS is the 2nd Generation, redesigned with a patented SawTooth point. It delivers faster starts, less torque, and eliminates the need for pre-drilling. All this reduces tool wear and extends your battery life!

No pre-drilling means more screws installed and less labour for you compared to conventional installation. The SDWS is the advanced alternative to bolting timber, or batten and coach screws, being 30% faster and 10% stronger than an equivalent batten screw.



Designed to be versatile the SDWS is recognised as a solution for engineered wood connections, and is backed by testing and load data. Applications include, but are not limited to:

Features and Benefits

  • 6-lobe T-40 drive eliminates cam‑outs, for easier installations and longer bit life — bit(s) included.
  • Head stamped for easy identification of length and diameter, for building certification.
  • Large washer-head provides superior clamping, while nibs offer greater control for the installer when seating the head.
  • Bold thread design provides superior holding power, even into the end grain of timber.
  • Patented SawTooth point for faster starts, less torque and no pre-drilling.

Product and Packaging Information

Model Length (mm)
Bulk Pack Qty 50 Pack Screw Thread
SDWS22300DB 950 SDWS22300DB-R50 76 38
SDWS22400DB 600 SDWS22400DB-R50 102 60
SDWS22500DB 600 SDWS22500DB-R50 127 70
SDWS22600DB 500 SDWS22600DB-R50 152 70
SDWS22800DB 400 SDWS22800DB-R50 203 70
SDWS221000DB 250 SDWS221000DB-R50 254 70

Bit(s) included with every pack. Replacement Bit: BIT40T-134-RC3

Serious Screws for Structural Applications

Load Tables

Table 1. Strong-Drive® SDWS Timber Screw Specifications

  1. For the purpose of measuring overall length, fasteners shall be measured from the underside of the head to bottom of the point.
  2. Length of thread includes the point.
  3. Bending yield strength determined following ASTM F1575 and based on minor thread diameter.
  4. Characteristic yield moment determined following EU14358 and based on minor thread diameter.
  5. Tension and shear properties are based on 0.5 of the average maximum load for screws tested in tension and shear, respectively. Shear strength is shear through the threads.

Table 2. Australian Limit States-Reference Characteristic Lateral Load Values (N) for Timber-to-Timber Connections with SDWS Timber Screws1,2,3,4,5

  1. Conditions without numbers in the matrix shall not be used.
  2. The main and side members shall have a minimum density of 530 kg/m3 for JD4, 450 kg/m3 for JD5 or 400 kg/m3 for JD6.
  3. The tabulated characteristic shear loads and withdrawal are for normal duration of load.
  4. Screws shall be installed straight into the side grain of the wood main member with the screw axis at a 90-degree angle to the wood fibres.
  5. Minimum fastener penetration shall be equal to the screw length less the thickness of the wood side member.
  6. Tabulated characteristic values for withdrawal are in N/mm of thread length into the main member.
  7. Withdrawal to end grain values are based on the lesser value of withdrawal from the main member or the characteristic pull-through of the screw through a 35 mm thick side member of the same Joint Group, or tensile strength of the screw.

Strong‑Drive® SDWS Timber Spacing Requirements

Ledger Plate Shear Capacity

Bearer-to-Post Tie Down

  1. Refer to AS1684.2 or AS1684.3 Table 9.16 for typical comparison Tie-Down Connections.

Roof Batten-to-Rafter/Truss

  1. Refer to AS1684.2 or AS1684.3 Table 9.25 for typical comparison Tie-Down Connections.

Wall Plate-to-Stud Tie Down

  1. Refer to AS1684.2 or AS1684.3 Table 9.19 for typical comparison Tie-Down Connections.

Bottom Plate-to-Joist Tie Down

  1. Refer to AS1684.2 or AS1684.3 Table 9.18 for typical comparison Tie-Down Connections.
  2. Uplift capacity allows for 19 mm flooring under bottom plate.

Generic Footnote: For Australia, the Capacity Factor (φ) is 0.85 for nails and screws for structural joints in a Category 1 application. Reduce tabulated values where other Category applications govern.


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