Key Features
Built for Salt Air Type 316 stainless steel gives this screw the corrosion resistance you want for coastal builds, piers, boardwalks, and other wet-service wood connections where standard fasteners do not last. Fast Starts, Less Prep The SawTooth point is made for fast starts and helps eliminate predrilling in most applications, so you can move through heavy timber fastening with less setup. Heavy Timber Holding This Simpson Strong-Tie structural wood screw uses a 0.275 inch shank, a large washer head, and a deep T50 6-lobe recess for secure drive engagement in demanding wood-to-wood structural connections.
Overview
The Simpson Strong-Tie SDWS271000SS-R30 Strong-Drive SDWS TIMBER SS Screw is a 10 inch structural wood screw built for heavy-duty wood-to-wood fastening in coastal and severe corrosion environments. This is a structural wood screw designed for wood-to-wood fastening in marine and exterior timber applications. Model Number: SDWS271000SS-R30. If you are building or repairing piers, boardwalks, wharves, ledgers, or other exposed timber assemblies, this fastener is built for that kind of work.
What matters here is not just the length. The 0.275 inch shank diameter puts this screw into true structural territory, making it a practical alternative to spikes, lag bolts, and lag screws where you want strong holding power without the extra labor that usually comes with traditional large fasteners. Simpson Strong-Tie also calls out that no predrilling and no counterboring are required for most applications, which can save real time when you are driving a lot of fasteners into dense framing or large timber members.
The business end is set up to work, not just look good on paper. The SawTooth point is designed for fast starts, which helps the screw bite quickly and get moving without wandering. That is especially useful when you are working on weathered lumber, treated wood, or awkward exterior assemblies where you do not want to fight the fastener just to get it started. The thread design and heavy shank make this screw a better fit for structural fastening than a standard wood screw.
Drive performance is another big part of why this fastener makes sense on the job. The deep T50 6-lobe recess gives you a more secure bit fit than shallow drive recesses that cam out under load. When you are sinking a long 10 inch timber screw, that matters. Better engagement means more control, less stripping, and less wasted time swapping damaged bits or backing out half-driven screws. Simpson Strong-Tie lists the replacement driver bit as BIT50T-2-R1.
The head design is built around installation quality. This model uses a washer head with nibs that can drive flush to the wood surface while reducing splintering. That gives you broad bearing at the surface, which is important in wood-to-wood structural connections, and it helps the finished installation sit cleaner than you would expect from a fastener this substantial. The listed head diameter is 0.650 inch, so you are getting meaningful surface contact at the connection point.
Material choice is the whole reason this specific version exists. This screw is made from Type 316 stainless steel, which is intended for coastal and severe corrosion conditions. That makes it a smart choice anywhere salt air, moisture, or marine exposure would quickly chew through lesser fasteners. Simpson Strong-Tie specifically identifies applications such as piers, boardwalks, wharves, and ledgers, which tells you exactly where this product belongs.
For the buyer, the takeaway is simple. If you need a long stainless timber screw for structural wood fastening where corrosion resistance is non-negotiable, this is the right kind of fastener. It is aimed at contractors, marine builders, deck builders, and serious property owners working on exposed exterior timber structures. If your project is inland and dry, there may be lower-cost options. If your project lives near the ocean or in harsh wet conditions, this is the version you want to be looking at.
Made for Coastal Timber Work
This screw is built for the kind of exposed timber work that destroys ordinary fasteners. Marine structures and coastal builds need corrosion resistance and structural capacity at the same time.
- Type 316 stainless steel for coastal or severe corrosion environments
- Typical applications include piers, boardwalks, wharves, and ledgers
Drives Faster in Heavy Wood
Long structural screws can be a chore if the point will not bite and the drive recess will not hold. This one is set up to start fast and stay engaged while you put real torque on it.
- SawTooth point design for fast starts and no predrilling in most applications
- Deep T50 6-lobe recess helps maintain bit engagement under load
Clean, Flush Structural Install
The large head is there for holding power, but the design also helps the fastener finish cleanly at the surface. That matters when the connection is exposed and people are walking over or around it.
- Large flat washer-style head with nibs can drive flush to the wood surface
- Designed to reduce splintering during installation
Built Like a Structural Fastener
This is not a general-purpose deck screw. The dimensions, head size, and drive design are all aimed at structural wood connections where holding strength and installation reliability matter.
- 0.275 inch shank diameter for heavy-duty structural applications
- 10 inch overall length with 3 inch thread length
What’s in the Box
- (30) Simpson Strong-Tie SDWS271000SS-R30 timber screws
Key Specifications
| Material | Type 316 stainless steel |
|---|---|
| Length | 10 in. |
| Shank Diameter | 0.275 in. |
| Head Diameter | 0.650 in. |
| Drive Type | T50 6-lobe |
| Head Type | Washer head |
| Thread Length | 3 in. |
| Point Type | SawTooth point |
| Threads Per Inch | 5 |
| Pack Quantity | 30 |
Compatibility
Driver Interface Uses a T50 6-lobe drive recess. Replacement Bit Replacement driver bit: BIT50T-2-R1. Application Fit Designed for structural wood-to-wood and engineered-wood connections in coastal or severe corrosion environments.
Built For
Marine Construction Coastal Deck Work Pier Repairs Boardwalk Construction Wharf Framing Ledger Fastening Structural Wood-to-Wood Connections Exterior Timber Projects
Pro Tip
When you are placing screws close to the end of a ledger, pay attention to Simpson Strong-Tie spacing guidance. For screws installed between 2 inches and 4 inches from the end, the published ledger note calls for predrilling with a 3/16 inch drill bit.
Tool Nut’s Take
Tool Nut’s Take
Simpson Strong-Tie SDWS271000SS-R30 Strong-Drive SDWS TIMBER SS Screw for real coastal work
This is the kind of structural screw you buy when the job is exposed, the lumber is heavy, and you do not want to redo the work because the fasteners gave up first.
- Who it’s for: Contractors and serious builders working on piers, boardwalks, ledgers, rail assemblies, and other exterior timber connections in wet or salt-heavy environments.
- Why it stands out: Type 316 stainless steel, a heavy 0.275 inch shank, a fast-start SawTooth point, and a deep T50 drive make it a practical replacement for slower, more labor-intensive large fasteners.
- Worth knowing: This pack gives you 30 screws, and it is purpose-built for structural wood fastening. If you do not need marine-grade corrosion resistance, you may be paying for performance your project does not require.
Common Questions
- What is this screw made for? It is designed for structural wood-to-wood and engineered-wood connections, especially in coastal or severe corrosion environments.
- Does it require predrilling? Simpson Strong-Tie states that no predrilling is required for most applications thanks to the SawTooth point design.
- What drive does it use? It uses a deep T50 6-lobe drive recess.
- What can it replace? Simpson Strong-Tie positions it as an alternative to spikes, lag bolts, and lag screws.
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