Simpson Strong-Tie SDWS Timber Interior Screws are the go-to fastener when your indoor wood projects need serious strength. Designed for structural wood-to-wood connections, these screws are ideal for everything from basement framing to custom shelving or large furniture builds.

They feature a large washer head for exceptional holding power and a bold thread design that bites quickly into wood, no pre-drilling needed. The smooth shank under the head helps pull materials tightly together, delivering a secure, long-lasting connection.

Whether you're building a heavy-duty workbench or putting up interior walls in a workshop or basement, these screws offer the strength and speed DIYers need for larger indoor construction tasks.

Key Features:

• Interior Grade Finish – Optimized for indoor use, offering durable performance in dry, controlled environments.
• No Pre-Drilling Required – Save time on installs with a thread and point designed for fast starts and strong grip.
• Large Washer Head – Provides a broad bearing surface that increases pull-through resistance and clamping force.
• Sawtooth Point – ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications.