Simpson Strong-Drive SDS Heavy-Duty Connector Screw - 1/4 in. x 4-1/2 in. from 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 and serrated thread design deliver a secure, high-load connection in structural lumber, LVL, and other engineered wood products - making it a go-to choice for contractors and builders who need a reliable structural screw without the hassle of predrilling. The corrosion-resistant double-barrier coating ensures long-term performance in exterior and treated-lumber environments.

Key Features

• Type-17 Point - enables fast, no-predrill installation, saving labor time and simplifying connector fastening in the field
• Double-Barrier Coating - provides corrosion resistance for long-term durability in outdoor and pressure-treated lumber applications
• 3/8 in. Hex Drive Head - works with standard hex driver bits and a low-speed 1/2 in. drill for controlled, consistent driving torque
• Serrated Threads with 10 TPI - thread geometry grips structural and engineered wood securely, resisting pull-out and maintaining connection integrity under load
• 2-3/4 in. Thread Length on a 4-1/2 in. Screw - deep thread engagement into receiving members ensures maximum holding power in thick connector and wood-to-wood assemblies
• 0.235 in. Shank Diameter - optimized for high-strength structural performance while maintaining compatibility with Simpson Strong-Tie connector hole patterns
• Extensively Tested Design - backed by Simpson Strong-Tie's structural testing program, giving engineers and inspectors confidence in load-rated applications

Why This Product

• No predrilling required thanks to the Type-17 point - reduces installation steps and speeds up connector fastening on framing, post bases, hangers, and other structural connectors
• The double-barrier coating provides corrosion resistance that makes this screw suitable for exterior framing and wood treated with modern preservatives, where standard fasteners can corrode prematurely
• Designed specifically for Simpson Strong-Tie connector installations, ensuring proper fit, code-compliance confidence, and load-rated performance when used with matching connectors
• Works in wood-to-wood and engineered wood applications - a single fastener solution for LVL beams, PSL columns, OSB, and dimensional lumber connections reduces the need to stock multiple fastener types

Specifications

• Brand: Simpson Strong-Tie
• Length: 4-1/2 in.
• Shank Diameter: 0.235 in.
• Thread Length: 2-3/4 in.
• TPI: 10
• Thread Type: Serrated Threads
• Head Type: Hex Head
• Drive Type: 3/8 in. Hex
• Point Type: Type-17 Point
• Finish/Coating: Double-Barrier Coating

Available Pack Options

• SDS25412-R10: 10 Pk
• SDS25412MB: 100 Pk
• SDS25412: 800 Pk

Approved Applications

• Fastening Simpson Strong-Tie Connectors
• Wood-to-wood structural connections
• Engineered wood product assemblies

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 eliminate the need for predrilling, allowing the screw to self-start in structural lumber and engineered wood products. This makes installation faster and reduces the number of steps required on the job site.

What tool is recommended for driving these structural screws?

Simpson Strong-Tie recommends using a low-speed 1/2 in. drill fitted with a 3/8 in. hex driver. The hex head drive type is compatible with standard hex driver bits, providing controlled torque and reducing the risk of cam-out during installation.

Are these screws suitable for use with pressure-treated lumber or in exterior applications?

Yes. The double-barrier coating provides corrosion resistance, making these screws appropriate for use in outdoor settings and with pressure-treated lumber where moisture and chemical exposure can degrade standard fasteners over time.

Can this screw be used for engineered wood applications such as LVL or PSL?

Yes. The Simpson Strong-Drive SDS Heavy-Duty Connector Screw is designed for wood-to-wood and engineered wood applications in addition to connector installations. The serrated thread design and 0.235 in. shank diameter are suited for the dense fiber structure of engineered lumber products.

Note: The image displayed is a generic representation of the type of product. Product dimensions and/or thread length may differ from the picture. Please refer to the specifications listed above for exact product details.