Simpson Strong-Tie #10 x 2-1/2" Bugle-Head Wood Screw with T-25 6-Lobe Drive in Type 316 Stainless Steel is engineered for professional wood decking installations where lasting corrosion resistance is essential. Designed to fasten cedar, redwood, and preservative-treated lumber (non-hardwood), this fastener delivers a clean, flush finish while standing up to demanding outdoor and coastal environments where standard fasteners fall short. The combination of marine-grade 316 stainless steel construction, a precision Type-17 point, and coarse threading makes this screw a reliable choice for deck builders and contractors who need performance they can count on through seasons of exposure.

Key Features

• Type 316 Stainless Steel material - provides superior corrosion resistance against moisture, salt air, and the chemicals in preservative-treated woods, making it the right fastener for seaside and harsh outdoor applications
• T-25 6-Lobe drive recess - creates a secure bit-to-fastener engagement that reduces cam-out, extends bit life, and keeps driving efficient even in demanding repetitive installations
• Bugle-head profile engineered for flush countersinking - sits flush with or just below the decking surface without tearing wood fibers, delivering a professional, concealed finish
• Type-17 cutting point - bores into wood fibers on contact for fast, clean starts without the need for pre-drilling in most applications
• Coarse thread pattern - draws decking boards and other materials tightly against framing for a secure, gap-free connection
• 0.340" head diameter - sized to provide adequate bearing surface while sitting cleanly within the decking material
• #10 screw size at 2-1/2" length - optimized for penetration depth that anchors decking firmly to joists without over-penetrating framing members

Why This Product

• Built for coastal and seaside projects - Type 316 stainless steel offers a higher grade of corrosion resistance than standard 304 stainless, making it the preferred choice when salt spray, moisture, and chemical-treated lumber are all factors in the same installation.
• Reduces cam-out and lost time on the job - the 6-lobe T-25 drive locks the bit in place during driving, meaning fewer slips, less bit replacement, and faster completion of large decking areas.
• Delivers a cleaner, more professional appearance - the bugle-head geometry is specifically engineered to countersink flush without surface damage, so finished decks look as good as they perform.
• Compatible with a broad range of wood decking materials - rated for cedar, redwood, and preservative-treated woods (non-hardwood), this fastener covers the most common decking species used in residential and light commercial construction.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length: 2-1/2 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: 82
• Country of Origin: Taiwan

Available Pack Options

• T10250DT1: 1 Lb (82) - includes (1) T25 6-lobe driver bit
• T10250DT5: 5 Lb (410) - includes (1) T25 6-lobe driver bit
• T10250DTB: 2000 Pk - includes (2) T25 6-lobe driver bits

Approved Applications

• Cedar wood decking
• Redwood decking
• Preservative-treated wood decking (non-hardwood)
• General wood fastening in coastal and outdoor environments
• Seaside construction applications requiring superior corrosion resistance

Frequently Asked Questions

What makes Type 316 stainless steel different from standard stainless steel for decking applications?

Type 316 stainless steel contains higher levels of molybdenum than standard 304 stainless, which significantly improves resistance to chlorides, salt spray, and the corrosive chemicals found in preservative-treated lumber. This makes it the preferred fastener material for seaside installations and any project where long-term exposure to harsh elements is expected.

Is pre-drilling required when using this screw?

The Type-17 cutting point is designed to start quickly and drive cleanly into most wood decking materials without pre-drilling. However, pre-drilling is recommended near board ends to help prevent splitting, especially in species like cedar and redwood that can be prone to checking at the edges.

What drive bit does this screw require?

This screw uses a T-25 6-lobe drive bit. The 6-lobe geometry provides a secure bit-to-fastener fit that minimizes cam-out and extends bit life compared to traditional Phillips or square drives.

Can this screw be used with hardwood decking materials?

This Simpson Strong-Tie bugle-head wood screw is rated for cedar, redwood, and preservative-treated woods classified as non-hardwood. It is not specified for use with hardwood decking. For hardwood applications, consult the appropriate product specifications for fasteners rated for that material type.