The Simpson Strong-Tie® Strong-Drive® SDS HEAVY-DUTY CONNECTOR screw is a 1/4″ diameter structural wood screw ideal for various connector installations as well as wood-to-wood applications. It installs with no predrilling and has been extensively tested in various applications. The new SDS is improved with a patented easy driving 4CUT™ tip and a corrosion resistant double-barrier coating.



  • Designed for installation in Simpson Strong-Tie® structural connectors as well as wood-to-wood applications
  • Available with a double-barrier coating and type 316 stainless steel
  • 3/8″ hex head
  • Patented 4-CUT™ point (coated version) and type-17 point (stainless version) enable easy driving with no pre-drilling and minimal splitting
  • Double-barrier coating provides corrosion resistance equivalent to hot-dip galvanization
  • Head is stamped with the Simpson Strong-Tie “≠” sign and fastener length for easy identification after installation
  • A low-speed 1/2″ drill with a 3/8″ hex driver is the recommended tool for installation

Material: Heat-treated carbon steel; Type 316 stainless steel

STAINLESS STEEL: The SDS Strong-Drive 1/4″ wood screw line has expanded to include stainless-steel SDS screws in 1 1/2″ to 3 1/2″ lengths, suitable for fastening Simpson Strong-Tie stainless-steel products. Offering the same easy-driving, split-reducing installation of the standard SDS screw, these screws are made from type 316 stainless steel. The new stainless-steel SDS screws are appropriate for higher-exposure environments where maximum corrosion-resistance is required.

Finish: SDS—Double Barrier (all lengths); SDS—Type 316 Stainless Steel (1 1/2″ thru 3 1/2″ lengths)

Double-barrier coating provides corrosion resistance equivalent to hot-dip galvanization.
Contact Simpson Strong-Tie for product availability and ordering information.

  1. Allowable loads for SDS screws are based on ICC-ES Code Report ESR-2236. Screws may be provided with the 4CUT™ or Type-17 point.
  2. SDS screws install best with a low speed 1/2″ drill with a 3/8″ hex head driver.
  3. Allowable loads are shown at the wood load duration factor of CD = 1.00. to interior-dry use only. Loads may be increased for load duration up to a CD = 1.60.
  4. Allowable withdrawal load for DF/SP/SCL is 172 lbs./in. and for SPF/HF withdrawal is 150 lbs./in.. Total withdrawal load is based on actual thread penetration into the main member
  5. LSL wood-to-wood applications that require 4 1/2″, 5″, 6″ and 8″ SDS screws are limited
  6. Minimum spacing requirements are listed in ICC-ES ESR-2236.


  1. Noted loads are based on ICC-ES Code Report ESR-2236 and/or testing per ICC AC233 and assume a minimum main member thickness of the screw length minus the side member thickness. All other allowable loads are based on the 2005 National Design Specification (NDS) and a minimum penetration of 6D = 1.45″ into the main member.
  2. Values are valid for a connection involving only two members. Where the side and main members have different specific gravities, the lower values shall be used.
  3. Allowable loads are also applicable to structural composite lumber (e.g., LVL, PSL, and LSL) having an equivalent specific gravity of 0.50 or greater.
  4. Allowable loads are shown at the wood load duration factor of CD = 1.00. Loads may be increased for load duration by the building code up to a CD = 1.60. The Designer shall apply all adjustment factors required per NDS.
  5. Loads are based on installation into the side grain of the wood members with the screw axis perpendicular to the wood fibers.
  6. Loads apply to appropriate stainless-steel models.