Simpson Strong-Tie #10 x 3" Bugle-Head Wood Screw with T-25 6-Lobe Drive in Type 305 Stainless Steel is engineered for professional wood decking installations where long-term corrosion resistance and a clean, concealed finish are required. Designed for use with cedar, redwood, and preservative-treated lumber (non-hardwood), this fastener delivers the holding power and flush-countersinking performance that contractors and experienced DIYers depend on for exterior deck projects exposed to moisture and harsh outdoor conditions.

Key Features

• Type 305 Stainless Steel material - provides superior corrosion resistance, making this screw a reliable choice for outdoor decking, wet environments, and installations with preservative-treated or naturally acidic woods like cedar and redwood
• T-25 6-Lobe drive recess - delivers a secure bit engagement that dramatically reduces cam-out, protecting both the screw head and the driver bit for longer bit life and more consistent, fatigue-free driving
• Bugle-head profile engineered for flush countersinking - seats smoothly at the surface of the decking board without tearing the wood fibers, yielding a professional, concealed finish that enhances the appearance of the finished deck
• Type-17 cutting point - bores into wood fibers quickly for fast, clean starts without pre-drilling in most field conditions, reducing installation time on large decking projects
• Coarse thread pattern - draws decking boards tightly down to the framing for a snug, stable connection that minimizes board movement and reduces the chance of squeaking or warping over time
• #10 screw diameter with 0.340" head diameter - sized to provide strong holding power in standard decking lumber without over-stressing the wood or leaving an oversized countersink impression
• 3" length - gives adequate thread penetration into the joist or substructure for a secure, long-lasting mechanical connection through typical decking board thicknesses

Why This Product

• If you are fastening cedar, redwood, or pressure-treated decking, Type 305 Stainless Steel is the right material choice - it resists the chemical reaction and accelerated corrosion that can occur when standard steel fasteners contact tannic or preservative-treated woods, helping your deck last for years without rust streaking or fastener failure
• The 6-lobe T-25 drive is a direct answer to one of the most common frustrations in deck installation - cam-out. A more secure bit engagement means fewer stripped heads, less wasted time, and a noticeably cleaner finished surface
• The bugle-head geometry solves the problem of surface tearing and raised fastener heads by guiding the screw to sit perfectly flush, producing a smooth, attractive deck surface without additional finishing work
• The Type-17 point and coarse threads work together to simplify installation - the cutting tip starts fast and the aggressive threads pull boards tight to framing without requiring a pilot hole in most applications, keeping the job moving efficiently

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length: 3 in.
• Head Type: Bugle Head
• Head Diameter: 0.340 in.
• Drive Type: T25 6-Lobe
• Thread Type: Coarse Threads
• Point Type: Type-17 Point
• Material: Type 305 Stainless Steel
• Finish: Type 305 Stainless Steel
• Approx. Count Per Lb: 68
• Country of Origin: Taiwan

Available Pack Options

• S10300DT1: 1 Lb (68) - includes (1) T25 6-lobe driver bit
• S10300DT5: 5 Lb (340) - includes (1) T25 6-lobe driver bit
• S10300DTB: 1500 Pk - includes (2) T25 6-lobe driver bits

Frequently Asked Questions

What types of wood is this screw compatible with?

This screw is designed for fastening all types of wood decking, including cedar, redwood, and preservative-treated woods. It is not recommended for hardwood decking applications.

Why is Type 305 Stainless Steel the right finish for outdoor deck screws?

Type 305 Stainless Steel offers superior corrosion resistance compared to standard steel or zinc-plated fasteners. This is especially important when fastening naturally acidic woods like cedar and redwood, or preservative-treated lumber, where chemical reactions can cause ordinary screws to corrode and stain the wood surface prematurely.

What driver bit do I need for this screw?

This screw uses a T-25 6-lobe drive, also referred to as a 6-lobe or star-drive recess. The 6-lobe geometry provides a more secure fit between the bit and the screw head, reducing cam-out and extending bit life compared to Phillips or square drive systems.

Do I need to pre-drill before installing this screw?

The Type-17 cutting point is designed for fast starts and is intended to reduce or eliminate the need for pre-drilling in most wood decking applications. However, pre-drilling is recommended near board ends to help prevent splitting of the wood.

Note: Product dimensions may differ from picture.