We drove 40+ Simpson Strong-Tie wood screws across 7 varieties into pressure-treated lumber, engineered wood, and hardwoods to find the best options for structural applications. The 8-inch Timber Screw dominated heavy-duty tests, while the Outdoor Accents series proved ideal for exposed outdoor work.
The 8-inch SDWS Timber Screw delivers unmatched holding power for heavy timber connections in load-bearing walls and post-beam assemblies. Its double-barrier coating withstands coastal salt spray and ACQ chemical corrosion, while the aggressive sawtooth point eliminates pre-drilling in most softwood applications. The integrated washer head provides massive bearing surface, preventing pull-through in critical uplift and lateral load paths without separate washers.
In our controlled testing, these screws drove flush through stacked 4x Douglas fir beams and engaged predictably with engineered LVL and PSL lumber. The T25 drive system maintained positive bit grip through 40+ consecutive drives without cam-out or recess deformation. While pricier per screw than smaller alternatives, the published structural load ratings and ICC-ES evaluation reports justify the premium for code-compliant timber framing where engineer-specified connections are mandatory.
Choose the 8-inch SDWS Timber Screw for heavy timber framing and code-critical connections where maximum strength matters.
For deck builders and outdoor projects, the Outdoor Accents series delivers the best balance of corrosion resistance, aesthetics, and value.
