0.220" x 4" Strong-Tie SDWS22400DBB-R50 Timber Screw - Double Barrier Coating, Black | Qty. 50 Underlayment & Subfloor Screws while a sharp Type 17

while a sharp Type 17 point delivers fast starts and reduces the need for predrilling

easy installation into OSB without splitting

Pre-Drilling: When working with dense engineered wood

Multiple Options Available: Choose from various lengths and diameters to match your substrate thickness

0.220" x 4" Strong-Tie SDWS22400DBB-R50 Timber Screw - Double Barrier Coating, Black | Qty. 50 Underlayment & Subfloor Screws while a sharp Type 17Simpson Strong Tie SDWS Timber Screws (Exterior Grade) are your go to fasteners when strength and weather resistance matter. Ideal for outdoor framing, landscaping, or heavy duty builds, these structural wood screws help DIYers get pro level results without the need for pre drilling. Coated with a high performance Double Barrier finish, they resist corrosion from rain, moisture, and treated lumber. The large washer head adds serious clamping power,