Simpson Strong-Tie SDWS Timber Screws (Interior Grade) are made for serious holding power in your indoor wood-to-wood connections. Whether you're framing interior walls, building shelves, or assembling custom wood structures, these structural screws offer dependable strength without the hassle of pre-drilling.

With their aggressive thread design and large washer-style head, these screws drive quickly and hold tightly, perfect for basement builds, workshop upgrades, or home renovations. The smooth upper shank helps pull wood members together for solid, gap-free joints every time.

Designed specifically for dry, indoor environments, they’re an excellent alternative to lag screws when you want pro-level strength and easier installation.

Key Features:

• Interior Use Only – Optimized for dry conditions such as basements, interior framing, or enclosed workshops.
• No Pre-Drilling Required – Sharp tip and aggressive threads allow for quick, clean driving into wood.
• Washer-Style Head – Increases clamping force while reducing the risk of pull-through or material damage.
• Smooth Upper Shank – Pulls materials tightly together for stronger, flush joints.