Description

Key Features

No Predrilling Needed

The Type-17 point starts fast and drives clean, so you can move through connector and wood fastening work without stopping to predrill. That saves time and helps limit splitting in the wood.

Built for Structural Hold

This heavy-duty connector screw uses serrated threads, a 1/4 in. shank, and a 3/8 in. hex head with integrated washer to pull tight and hold solid in wood-to-wood and connector applications.

Exterior-Ready Coating

The double-barrier coating is there for corrosion resistance in outdoor and exposed work. If the job includes decks, framing hardware, or other exterior connectors, that matters.

Overview

The Simpson Strong-Tie Strong-Drive SDS Heavy-Duty Connector Screw, 1/4-in. x 2-1/2-in. DB Coating, 200-Pack (SDS25212MB) is a high-strength structural wood screw made for connector fastening, wood-to-wood fastening, and engineered wood applications. This is a heavy-duty connector screw designed for structural fastening in wood framing and connector installations. Model Number: SDS25212MB.

What makes this screw different from a standard wood screw is that it is built specifically for demanding structural work. The 1/4 in. diameter body gives it the strength expected for connector and framing applications, while the Type-17 point helps it start quickly without predrilling. On the job, that means faster installs and less hassle when you are driving into framing members, ledgers, or hardware locations where productivity matters.

The Simpson Strong-Tie Strong-Drive SDS Heavy-Duty Connector Screw uses serrated threads to bite into the wood and pull the fastener in with solid holding power. That thread design is there for more than just grip. It also helps the screw drive more efficiently, which is useful when you are installing multiple fasteners in a row across connectors, deck framing, or general structural wood fastening. The 2-1/2 in. overall length with 1-1/2 in. thread length makes this particular version a practical middle size for many common heavy connector and framing tasks.

The head design is equally important here. You get a 3/8 in. hex drive with a 0.500 in. integrated washer under the hex head. In plain terms, that gives you a broad bearing surface and a secure drive interface that is less likely to cam out than smaller recess styles. If you are working with structural connectors or fastening into lumber in awkward positions, a hex head is the kind of detail that makes the install more controlled and more repeatable.

For exterior work, the double-barrier coating is a key reason to choose this version. Simpson lists it as corrosion-resistant, which makes it better suited for outdoor framing and exposed wood applications than plain interior fasteners. If you are building or repairing deck structures, mounting hardware to framing, or installing approved Simpson Strong-Tie connectors, this coating helps the fastener hold up better over time.

This screw is also built with jobsite identification in mind. The head is stamped with the Simpson Strong-Tie mark and fastener length, which sounds minor until you are coming back to an installed assembly and need to verify what was used. That can save time during inspections, punch-list work, or when matching existing installed hardware on additions and repairs.

For installation, Simpson recommends a low-speed 1/2 in. drill with a 3/8 in. hex driver. There is also a replacement driver bit available, model BITHEXR38-R1, which is worth knowing if you keep structural fasteners stocked in the shop or trailer. This is not a finish screw or a general-purpose cabinet screw. It is purpose-built fastening hardware for structural wood work where connector compatibility, drive strength, and holding performance matter.

Who should buy it? Contractors, deck builders, framers, remodelers, and serious DIY users working with structural connectors or demanding wood fastening jobs. If you need a fastener for heavy-duty Simpson Strong-Tie connectors, deck framing, or structural wood-to-wood work and you want a screw that installs fast without predrilling, this is exactly the kind of screw you buy by the box and keep on hand.

Fast Structural Installs in Wood

This is where this structural wood screw earns its keep. It is designed to go in quickly, hold tight, and keep you moving through connector and framing work without adding a predrill step.

• Type-17 point helps start quickly with no predrilling
• 1/4 in. diameter screw body is built for heavy-duty wood fastening

Made for Connector Hardware

The SDS line is intended for heavy-duty Simpson Strong-Tie connectors, not just general wood screw duty. That means the geometry, head style, and grip are aimed at structural hardware where fit and holding power count.

• Approved for heavy-duty Simpson Strong-Tie connectors
• 3/8 in. hex head with integrated washer helps seat securely against hardware and wood

Reliable for Exterior Framing Jobs

Exterior projects need more than just holding power. They need a fastener finish that stands up better outdoors. The double-barrier coating makes this version a smart pick for exposed wood structures and outdoor hardware installs.

• Double-barrier coating adds corrosion resistance
• Good fit for deck work, exterior brackets, and treated lumber framing applications where the specified fastener matters

What’s in the Box

• (200) Simpson Strong-Tie SDS25212MB Strong-Drive SDS Heavy-Duty Connector Screws

Replacement driver bit model BITHEXR38-R1 is not included.

Key Specifications

Length	2-1/2 in.
Diameter	1/4 in.
Drive Type	3/8 in. Hex
Head Type	Hex Head with 0.500 in. Integrated Washer
Thread Type	Serrated Threads
TPI	10
Thread Length	1-1/2 in.
Point Type	Type-17 Point
Coating	Double-Barrier Coating
Pack Quantity	200

Compatibility

Driver Interface

Uses a 3/8 in. hex drive. Simpson recommends installation with a low-speed 1/2 in. drill and a 3/8 in. hex driver.

Replacement Driver Bit

Replacement driver bit model: BITHEXR38-R1.

Application Fit

Designed for heavy-duty Simpson Strong-Tie connectors and for wood-to-wood and engineered wood fastening applications.

Built For

Deck Building Framing Connector Installation Wood-to-Wood Fastening Engineered Wood Remodeling General Contracting DIY / Hobbyist

Pro Tip

Use a low-speed 1/2 in. drill with the correct 3/8 in. hex driver instead of running these too fast. You will get better control seating the washer head and cleaner installs in connectors and framing lumber.

Tool Nut’s Take

Tool Nut’s Take

Simpson Strong-Tie Strong-Drive SDS Heavy-Duty Connector Screw, 1/4-in. x 2-1/2-in. DB Coating, 200-Pack (SDS25212MB) is the right screw when regular wood screws are not enough

This is the kind of structural fastener you buy when you need real connector performance, fast installation, and exterior-ready corrosion resistance in one box.

• Who it’s for: Deck builders, framers, remodelers, and serious DIY users installing structural connectors or doing heavy wood-to-wood fastening.
• Why it stands out: Type-17 point for no-prep starts, serrated threads for strong pull-down, and a hex washer head that makes sense for structural work.
• Worth knowing: This is a 200-pack and the replacement driver bit is not included, so make sure your install setup already matches the 3/8 in. hex drive requirement.

Common Questions

• Does this screw require predrilling? No. The Type-17 point is designed for easy driving with no predrilling and minimal wood splitting.
• What type of tool is recommended for installation? Simpson recommends a low-speed 1/2 in. drill with a 3/8 in. hex driver.
• Is this screw intended for structural connector applications? Yes. Simpson lists it for heavy-duty Simpson Strong-Tie connectors, and it is also used for wood-to-wood and engineered wood applications.
• What finish does this model use? SDS25212MB uses a corrosion-resistant double-barrier coating.