Key Features
No Predrilling Needed The Type-17 point starts fast and drives cleanly into wood, so you spend less time drilling pilot holes and more time fastening connectors. Built for Exterior Use Double-barrier coating adds corrosion resistance for outdoor and exposed applications where standard screws are not the right call. Heavy-Duty Connector Screw This Simpson Strong-Tie heavy-duty connector screw uses a 3/8 inch hex head with an integrated washer for solid bearing surface and dependable pull-down in connector installs.
Overview
The Simpson Strong-Tie SDS25112MB Strong-Drive Heavy-Duty Connector Screw is a 1/4 inch diameter structural wood screw made for connector installation and heavy fastening in wood applications. This is a heavy-duty connector screw designed for fastening Simpson Strong-Tie connectors and other structural hardware into wood without predrilling. Model Number: SDS25112MB. This version gives you a 1-1/2 inch length, double-barrier coating, and a 300-count package for repetitive install work.
What matters here is speed and consistency. The Type-17 point is built to start easier in wood, which cuts down on the need for pilot holes and helps reduce splitting. On the job, that means faster installs when you are hanging hardware, tying framing members together, or setting exterior structural connectors where you want a strong mechanical connection without the extra step of predrilling every fastener location.
The head and thread design are doing real work too. This screw uses a 3/8 inch hex head with a 0.500 inch integrated washer, so you get better bearing at the connection point than you would with a smaller conventional head. The serrated threads help the screw drive more efficiently, which is one reason these are popular for connector work where clean seating and repeatable drive performance matter.
For outdoor and exposed applications, the double-barrier coating is a big part of the value. It gives the screw added corrosion resistance compared with plain interior fasteners, which makes it a practical choice for deck-related work, exterior framing, and other projects where moisture is part of the environment. If you are matching the fastener to exterior-rated hardware, this coating is one of the reasons the SDS line is commonly specified.
This fastener is also built around jobsite practicality. The head is stamped with the Simpson Strong-Tie identification mark and the fastener length, which makes it easier to verify what was installed after the fact. That sounds small until you are inspecting a connection, sorting leftover hardware, or coming back to a project later and need to know exactly what is in the assembly.
The Simpson Strong-Tie SDS25112MB Strong-Drive Heavy-Duty Connector Screw installs with a low-speed 1/2 inch drill and a 3/8 inch hex driver. It is also compatible with replacement driver bit BITHEXR38-R1. That makes it easy to fit into a standard structural fastening setup without hunting down a specialty drive system.
Who should buy it? Contractors, deck builders, remodelers, framers, and serious DIY users who are installing Simpson Strong-Tie connectors or doing structural wood fastening outdoors. If you need a general light-duty wood screw, this is more screw than you need. If you need a fast, strong, no-nonsense structural connector screw that saves time over predrilled lag-style installs, this is exactly the lane it belongs in.
Faster Structural Fastening
This screw is built to keep connector installs moving. The point starts cleanly, the threads pull well, and the hex head gives you solid engagement when you are driving into framing lumber.
- Type-17 point helps eliminate predrilling in many wood applications
- Serrated threads are designed for easier driving
Made for Connector Hardware
The head style and washer design make sense for metal connector work. You get broad bearing at the hardware face and a drive system that holds up well when you are repeating the same fastening pattern all day.
- 3/8 inch hex head with integrated washer
- Ideal for heavy-duty Simpson Strong-Tie connectors
Exterior-Ready Finish
For exposed wood construction, coating matters. The double-barrier finish helps this structural screw hold up better in outdoor conditions than a basic interior fastener.
- Double-barrier coating for corrosion resistance
- Good fit for decks, exterior framing, and outdoor connector installs
What’s in the Box
- (300) Simpson Strong-Tie SDS25112MB 1/4 inch x 1-1/2 inch heavy-duty connector screws
Replacement driver bit BITHEXR38-R1 is compatible, but not included.
Key Specifications
| Length | 1-1/2 in. |
|---|---|
| Shank Diameter | 0.235 in. |
| Drive Type | 3/8 in. hex |
| Head Type | Hex head with 0.500 in. integrated washer |
| Thread Type | Serrated threads |
| Thread Length | 1 in. |
| Point Type | Type-17 point |
| Packaging Quantity | 300 |
Compatibility
Driver Setup Installs with a 3/8 inch hex driver. Simpson Strong-Tie recommends a low-speed 1/2 inch drill 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.
Built For
Deck Building Exterior Framing Connector Installation General Contracting Remodeling DIY / Hobbyist
Pro Tip
Run these with a low-speed 1/2 inch drill and let the Type-17 point do the starting. If you hammer them in with too much speed, you give up some of the clean drive and control that makes SDS screws worth buying in the first place.
Tool Nut’s Take
Tool Nut’s Take
Simpson Strong-Tie SDS25112MB Strong-Drive Heavy-Duty Connector Screw Gets the Job Done Faster
If you are installing structural connectors in wood and want to skip the pilot-hole routine, this is the kind of fastener that earns its keep pretty quickly.
- Who it’s for: Deck builders, framers, remodelers, and serious DIY users installing exterior hardware or heavy-duty connectors.
- Why it stands out: The Type-17 point, serrated threads, and washer-head hex design make it quicker and more jobsite-friendly than messing around with slower lag-style installs.
- Worth knowing: This is a 300-pack of 1-1/2 inch screws, so it is a solid fit for repeated connector work, not a mixed hardware assortment. The compatible replacement bit is not included.
Common Questions
- What is this screw designed for? It is designed for heavy-duty Simpson Strong-Tie connectors and structural wood fastening applications.
- Does it require predrilling? The Type-17 point is designed for easy driving with no predrilling in typical wood applications.
- What tool should be used to install it? Simpson Strong-Tie recommends a low-speed 1/2 inch drill with a 3/8 inch hex driver.
- Is this an exterior-rated screw? This SDS25112MB version uses a double-barrier coating for added corrosion resistance in exterior applications.
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