No Predrilling Needed The Type-17 point starts fast and drives cleanly into wood, so you can move quicker through connector installs without stopping to predrill. Built for Outdoor Exposure Double-barrier coating adds corrosion resistance for exterior wood applications, which matters when the fastener is expected to stay put for the long haul. Heavy-Duty Connector Screw Grip A 3/8 inch hex head with integrated washer and serrated threads helps the Simpson Strong-Tie SDS25412MB Strong-Drive SDS Heavy-Duty Connector Screw pull down tight and hold strong in connector and wood-to-wood work.
The Simpson Strong-Tie SDS25412MB Strong-Drive SDS Heavy-Duty Connector Screw is a 1/4 inch class structural wood screw built for heavy-duty connector installation and wood fastening where you want speed, holding power, and less hassle during install. This is a heavy-duty connector screw designed for structural wood fastening and connector installation. Model Number: SDS25412MB. This pack includes 100 screws sized 4-1/2 inches long with a double-barrier coating for exterior-use durability.
What makes this screw matter on the job is how it cuts out extra steps. The Type-17 point is made for easy starts with no predrilling in typical wood applications, which helps reduce install time and minimizes splitting. When you are working through connector brackets, ledger attachments, or general heavy wood fastening, that means less bit walking, less setup, and fewer interruptions.
The drive and head design are just as important as the point. This screw uses a 3/8 inch hex drive and a hex head with an integrated 0.500 inch washer. In plain terms, that gives you a positive drive engagement and more bearing surface under the head, so the fastener seats firmly against the connector or wood surface. That is the kind of detail that matters when you are tightening hardware that cannot afford to feel loose or undersized.
The thread design is set up for grip, not just entry. Serrated threads and a 10 TPI thread pattern help the screw bite into wood and pull material together. On this specific model, the thread length is 2-3/4 inches, which gives you solid engagement while keeping part of the shank smooth for clamp-down performance in many wood-to-wood and connector applications.
For outdoor fastening and exposed work, the double-barrier coating is a big part of the story. Simpson positions this line for exterior wood screw use and connector applications, and the coating is there for added corrosion resistance over time. If you are installing structural connectors, deck-related hardware, or other outdoor framing components, that coating is one of the reasons to choose this fastener over a generic wood screw.
The Simpson Strong-Tie SDS25412MB Strong-Drive SDS Heavy-Duty Connector Screw is also designed to be easy to identify after installation. The head is stamped with the Simpson Strong-Tie mark and fastener length, which helps when you need to verify what was used after the job is done. That is a small feature, but on inspection-driven work or repeat installs, it saves guessing.
Installation is straightforward. Simpson recommends using a low-speed 1/2 inch drill with a 3/8 inch hex driver. That matches what most pros already know about driving larger structural screws: steady torque and control matter more than just raw speed. This is not a finish screw. It is a structural fastener made to seat hard and hold.
Who is this for? Carpenters, deck builders, remodelers, and serious DIY users working with Simpson Strong-Tie connectors or other heavy wood connections. If you need a structural wood screw for fastening connectors, ledger-style work, or thick wood members and you want a 100-count pack of 4-1/2 inch screws that installs faster than a lag-and-predrill routine, this is the right kind of fastener.
This screw is built to keep installs moving. The point starts quickly, the hex drive stays engaged, and the fastener is meant to go in without the predrill step that slows down structural fastening.
This is not just a long wood screw. It is designed specifically for heavy-duty Simpson Strong-Tie connectors, where clamp force, head bearing, and consistent installation all matter.
Exterior fasteners need more than holding power. They also need to stand up to exposure. The double-barrier coating gives this structural screw the corrosion resistance needed for outdoor wood projects where hardware stays exposed to the elements.
| Length | 4-1/2 in. |
|---|---|
| Shank Diameter | 0.235 in. |
| Drive Type | 3/8 in. Hex |
| Head Type | Hex Head with Integrated 0.500 in. Washer |
| Thread Type | Serrated Threads |
| Thread Length | 2-3/4 in. |
| Point Type | Type-17 Point |
| Packaging Quantity | 100 |
| Coating | Double-Barrier Coating |
| Weight | 5.4 lbs |
Driver Interface Uses a 3/8 inch hex drive. Simpson recommends a 3/8 inch hex driver for installation. Replacement Driver Bit Compatible with replacement driver bit BITHEXR38-R1. Application Fit Designed for heavy-duty Simpson Strong-Tie connectors and structural wood fastening applications.
Deck Building Carpentry Construction Remodeling Exterior Wood Fastening Connector Installation Wood-to-Wood Structural Fastening DIY / Hobbyist
Run these with a low-speed drill instead of a high-speed impact when you want the screw to seat clean and tight against a connector. You will get better control at the head and reduce the chance of overdriving the washer into the hardware.
Tool Nut’s Take
This is a proven heavy-duty connector screw that saves time on structural wood fastening without feeling like a shortcut.
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