Simpson Exterior Structural Timber Screws – 4 in Heavy-Duty Wood Fasteners, T40 Drive (50-Pack)

Built for jobs where ordinary wood screws fall short, these exterior structural timber screws deliver the holding power professionals rely on for critical wood-to-wood connections.

Designed as a faster, cleaner alternative to lag bolts, these fasteners drive with confidence into pressure-treated and exterior lumber without the extra steps of pre-drilling or washers. The aggressive threading provides strong pull-out resistance, while the T40 drive ensures superior torque control and reduced cam-out during installation.

A durable exterior-grade coating protects against corrosion, making these screws ideal for long-term outdoor use. Whether you’re assembling deck framing, pergolas, fencing, or heavy timber structures, these screws are engineered to hold tight and perform under load.

Reliable strength. Faster installation. Built for exterior construction.