Simpson Strong-Drive SDS Heavy-Duty Connector Screw - 1/4 in. x 1-1/2 in., Type 316 Stainless Steel is a high-strength structural fastener engineered for demanding connector installations, wood-to-wood assemblies, and engineered wood applications. Built from Type 316 stainless steel, this 1/4 in.-diameter hex-head screw delivers exceptional corrosion resistance in high-exposure environments - including coastal, saltwater-adjacent, and chemically aggressive conditions where standard carbon-steel fasteners would degrade. It drives cleanly with no predrilling required, making it a reliable choice for fastening Simpson Strong-Tie stainless-steel connectors and hardware with minimal setup time.

Key Features

• Type 316 Stainless Steel construction - provides maximum corrosion resistance in high-moisture, saltwater, and chemical-exposure environments, making it appropriate where standard or galvanized fasteners fall short.
• No predrilling required - the Type-17 point cuts into wood fibers cleanly on contact, reducing installation time and eliminating a separate boring step in structural connector assemblies.
• 3/8 in. hex head - drives with a standard hex driver for fast, consistent torque transfer; eliminates cam-out and stripped-head failures common with Phillips or square drive fasteners.
• Serrated threads with 10 TPI - serrations bite aggressively into wood and engineered lumber, providing strong pull-through resistance and a secure, locked connection in structural applications.
• Type-17 auger point - self-starting tip reduces splitting in wood and engineered wood substrates, enabling clean, split-reducing installation without compromising surrounding material.
• 1 in. thread length on a 1-1/2 in. screw - thread engagement is proportioned for connector-to-member fastening, ensuring threads bite fully into the receiving member for maximum holding strength.
• 0.235 in. shank diameter - a robust shank cross-section supports shear loads typical in structural connector applications, contributing to the overall strength of the fastened assembly.
• Extensively tested in multiple applications - tested performance data backs each installation scenario, giving structural professionals and contractors documented confidence in every connection.

Why This Product

• Purpose-built for Simpson Strong-Tie stainless-steel connectors - designed specifically to fasten Simpson Strong-Tie stainless-steel hardware, ensuring material compatibility and maintaining the corrosion-resistance of the full connector system rather than creating a galvanic weak point with a dissimilar fastener.
• Engineered for high-exposure environments - Type 316 stainless steel is the appropriate specification for applications where maximum corrosion resistance is required, including marine, waterfront, and chemically treated lumber settings where lesser materials fail prematurely.
• No predrilling means faster, simpler installation - the Type-17 point and serrated thread geometry allow the screw to self-start and drive in a single step, reducing tool changes and labor in repetitive connector installation work.
• Available in a range of lengths (1-1/2 in. to 3-1/2 in.) - the SDS stainless-steel screw line covers multiple connector and structural fastening needs, allowing the same screw system and driver setup to be used across different assembly depths on the same job.

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Length: 1-1/2 in.
• Shank Diameter: 0.235 in.
• Thread Length: 1 in.
• Thread Type: Serrated Threads
• TPI: 10
• Head Type: Hex Head
• Drive Type: 3/8 in. Hex
• Point Type: Type-17 Point
• Country of Origin: Taiwan

Available Pack Options

• SDS25112SS-R25: 25 Pk
• SDS25112SS: 1500 Pk

Approved Applications

• Fastening Simpson Strong-Tie Connectors
• Wood-to-wood structural connections
• Engineered wood product installations
• High-exposure and corrosive environment fastening

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

Why is Type 316 stainless steel specified for these screws instead of a standard coated screw?

Type 316 stainless steel offers maximum corrosion resistance, making these screws appropriate for higher-exposure environments - such as coastal, marine, or chemically active settings - where standard or galvanized fasteners would corrode prematurely. Using a matching stainless fastener with stainless-steel Simpson Strong-Tie connectors also avoids galvanic corrosion between dissimilar metals.

Do these screws require predrilling before installation?

No. The Type-17 point is designed for self-starting, split-reducing installation with no predrilling required. This makes them suitable for direct installation into wood and engineered wood substrates in a single step, saving time during connector assembly.

What driver is recommended for installing the SDS 1/4 in. x 1-1/2 in. stainless screws?

A low-speed 1/2 in. drill fitted with a 3/8 in. hex driver is the recommended installation tool. The 3/8 in. hex head is designed to work with this driver configuration for consistent, controlled torque during structural fastening.

Are these stainless SDS screws compatible with engineered wood products as well as dimensional lumber?

Yes. The Simpson Strong-Drive SDS Heavy-Duty Connector screw is designed for various connector installations as well as wood-to-wood and engineered wood applications. The serrated threads and Type-17 point are engineered to perform across both solid lumber and engineered lumber substrates.

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.