Simpson Strong-Tie #10 x 3" Bugle-Head Wood Screw in Type 316 Stainless Steel with T-25 6-Lobe Drive is engineered for demanding outdoor fastening applications where corrosion resistance is non-negotiable. Built from Type 316 stainless steel, this screw withstands saltwater exposure, chemical contact, and the corrosive compounds found in preservative-treated lumber, making it the right choice for coastal decks, dockside structures, and seaside installations. The bugle-head profile and coarse-thread shank work together to pull decking boards flush and tight against framing, delivering a clean, professional finish on cedar, redwood, and treated wood decking projects.

Key Features

• Type 316 Stainless Steel Material - provides superior corrosion resistance in saltwater, coastal, and chemically aggressive environments where standard steel fasteners would fail prematurely
• T-25 6-Lobe Drive Recess - creates a secure bit-to-screw connection that dramatically reduces cam-outs during installation, extending bit life and reducing installer fatigue on large decking projects
• Bugle-Head Profile with 0.340" Head Diameter - engineered for flush countersinking so the head seats neatly below the wood surface without tearing fibers, producing a concealed, professional-grade finish
• Coarse Thread Pattern - draws decking boards and other materials tightly down to the framing member with each turn, ensuring a secure, gap-free connection
• Type-17 Point - self-starting tip bores into wood fiber quickly for fast, efficient starts without the need for a pilot hole in most applications, saving time on the job
• 3" Length, #10 Gauge - sized to provide adequate penetration depth into the framing below the decking surface for a strong, lasting hold
• Approximately 68 screws per pound - predictable weight-to-count ratio makes it easy to estimate quantities needed for your project

Why This Product

• Built for saltwater and coastal environments - Type 316 stainless steel offers a higher level of corrosion resistance than Type 304 or standard zinc-plated screws, making this fastener specifically suited for seaside and marine-adjacent decking applications where rust and corrosion are constant concerns.
• Compatible with chemically treated lumber - modern preservative-treated woods contain compounds that accelerate corrosion in ordinary fasteners; the 316 stainless steel construction resists those chemicals, maintaining holding strength and appearance over time.
• Reduces installation errors and rework - the 6-lobe drive recess keeps the bit firmly seated through the full drive cycle, eliminating the slipping and stripping that can damage the screw head or the surrounding wood surface and require costly correction.
• Clean, finished look without extra steps - the bugle-head geometry countersinks flush with the wood face automatically as the screw seats, removing the need for a separate countersinking step and delivering a polished result on cedar, redwood, or treated decking right away.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length: 3 in.
• Head Diameter: 0.340 in.
• Head Type: Bugle Head
• Drive Type: T25 6-Lobe
• Thread Type: Coarse Threads
• Point Type: Type-17 Point
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Approx. Count Per Lb: 68
• Country of Origin: Taiwan

Available Pack Options

• T10300DT1: 1 Lb (68) - includes (1) T25 6-lobe driver bit
• T10300DT5: 5 Lb (340) - includes (1) T25 6-lobe driver bit
• T10300DTB: 1500 Pk - includes (2) T25 6-lobe driver bits

Approved Applications

• Wood decking installation, including cedar and redwood planking
• Preservative-treated lumber fastening (non-hardwood)
• Seaside and coastal deck construction where saltwater exposure is present
• Outdoor structures where long-term corrosion resistance is required
• Flush-finish countersink applications requiring a concealed fastener head

Frequently Asked Questions

What makes Type 316 stainless steel different from standard stainless steel for outdoor use?

Type 316 stainless steel contains a higher concentration of molybdenum compared to Type 304, which significantly improves its resistance to chlorides - the corrosive compounds found in saltwater and in many preservative-treated lumber formulations. This makes Type 316 the preferred choice for seaside applications and any project using chemically treated wood where ordinary fasteners would corrode and lose holding power over time.

Is predrilling required when using these screws near the ends of boards?

Predrilling is recommended near board ends to prevent splitting. The Type-17 self-starting point handles most mid-board installations without a pilot hole, but drilling a clearance hole near the ends of cedar, redwood, or treated boards reduces the risk of splitting and helps achieve a cleaner, professional result.

What driver bit does the T-25 6-lobe drive require?

The T-25 6-lobe drive recess is designed to be used with a T-25 Torx-compatible driver bit. The 6-lobe geometry creates a tight, cam-out-resistant engagement between the bit and the screw head, which reduces slipping, protects the screw recess, and extends the working life of the driver bit compared to traditional square or Phillips drives.

Can these screws be used with hardwood decking materials?

These bugle-head wood screws are approved for fastening all types of wood decking including cedar, redwood, and preservative-treated woods that are non-hardwood. For hardwood decking applications, a different fastener designed specifically for hardwood may be required. Predrilling is also more critical with denser wood species to avoid splitting and to ensure proper seating of the bugle head.

Note: Product dimensions may differ from picture.