Simpson Strong-Drive SDS Heavy-Duty Connector Screw - 1/4 in. x 3 in. by Simpson Strong-Tie is a high-strength structural fastener engineered for demanding connector installations, wood-to-wood assemblies, and engineered wood applications. The 0.235 in. shank diameter screw features a corrosion-resistant double-barrier coating and a Type-17 point that eliminates the need for predrilling, making it a reliable choice for structural framing, joist hanger installation, post cap fastening, and other heavy-duty connector work. Designed to deliver consistent performance in structural applications where fastener integrity and ease of installation both matter, this hex-head screw has been extensively tested across a wide range of connector and wood applications.

Key Features

• Type-17 point for no-predrilling installation - drives cleanly into wood and engineered lumber without requiring pilot holes, saving time and reducing steps on the job site.
• Double-barrier corrosion-resistant coating - provides enhanced protection against moisture and corrosion, making it well-suited for outdoor connector applications and treated lumber environments.
• 3/8 in. hex head drive type - works with a standard 3/8 in. hex driver and a low-speed 1/2 in. drill, allowing for efficient high-torque driving without cam-out or stripped fasteners.
• Serrated threads at 10 TPI - grip aggressively into wood and engineered wood, producing strong withdrawal resistance that keeps connectors locked firmly in place.
• 2 in. thread length on a 3 in. overall fastener - optimizes thread engagement depth for the connector and wood thickness combinations most commonly encountered in structural work.
• Hex head design with structural-grade shank - provides a solid bearing surface for the driver and transfers load efficiently through the connector into the structural member below.

Why This Product

• No predrilling required thanks to the Type-17 point - eliminates an entire installation step when fastening Simpson Strong-Tie connectors, joist hangers, post caps, and similar hardware to wood framing.
• The double-barrier coating goes beyond basic galvanizing, offering a higher level of corrosion resistance for structural connector fasteners exposed to outdoor conditions or pressure-treated lumber.
• Serrated threads combined with a 10 TPI thread pattern create strong mechanical engagement in both solid wood and engineered wood products, reducing the risk of fastener loosening under load.
• Extensively tested in connector and wood-to-wood applications - this screw is purpose-built to work with Simpson Strong-Tie connector hardware, so installers can be confident in the fastener-to-connector compatibility.

Specifications

• Brand: Simpson Strong-Tie
• Length: 3 in.
• Shank Diameter: 0.235 in.
• Drive Type: 3/8 in. Hex
• Head Type: Hex Head
• Thread Type: Serrated Threads
• Thread Length: 2 in.
• TPI: 10
• Point Type: Type-17 Point
• Coating: Double-Barrier Coating
• Finish: Double-Barrier Coating

Available Pack Options

• SDS25300-R25: 25 Pk
• SDS25300MB: 150 Pk
• SDS25300: 950 Pk

Approved Applications

• Fastening Simpson Strong-Tie Connectors

Install With

• A low-speed 1/2 in. drill with a 3/8 in. hex driver is the recommended tool for installation

Frequently Asked Questions

Does this screw require predrilling before installation?

No. The Type-17 point is specifically designed to enable easy driving into wood and engineered wood without any predrilling, streamlining the installation process for connector and structural applications.

What tool is recommended for installing these heavy-duty connector screws?

A low-speed 1/2 in. drill paired with a 3/8 in. hex driver is the recommended tool for installation, matching the 3/8 in. hex head on the screw.

What type of coating does this screw have, and why does it matter?

This screw features a double-barrier coating, which provides corrosion resistance beyond standard single-layer finishes. This makes the screw suitable for outdoor structural connector installations and applications involving treated lumber where moisture exposure is a concern.

Can this screw be used with engineered wood products?

Yes. The Simpson Strong-Drive SDS Heavy-Duty Connector Screw is designed and tested for use in wood-to-wood and engineered wood applications, in addition to fastening Simpson Strong-Tie connectors directly to structural members.

Note: The image displayed is a generic representation of the type of product. Product dimensions and/or thread length may differ from picture. Please see the item description above for specifications.