SDS Double Barrier Screw 1/4" x 3-1/2" (Model SDS25312MB)

The SDS Double Barrier Screw from Simpson Strong-Tie is a 1/4"-diameter, 3-1/2"-long heavy-duty connector screw engineered for superior wood-to-wood and engineered-wood fastening. Its corrosion-resistant double-barrier coating ensures long-term durability in outdoor and high-moisture environments, while the Type-17 point and serrated threads deliver fast, accurate installation with minimal splitting. Ideal for deck ledgers, guardrails, stair stringers and other structural connections.

Key Features

• Type-17 point for easy driving—no predrilling required and reduced wood splitting
• Serrated threads for enhanced holding power
• 3/8" external-hex head with integrated 0.500" washer for secure clamping
• Head stamped with Simpson Strong-Tie name and length for quick identification
• Corrosion-resistant double-barrier coating for extended service life
• Compatible with replacement driver bit BITHEXR38-R1 (sold separately)

⚠️ WARNING: This product can expose you to Tetrabromobisphenol A known to the State of California to cause cancer and Epichlorohydrin known to cause birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.