Simpson #8 x 1" Truss-Head Screw in 305 Stainless Steel is a precision-engineered fastener from Simpson designed for securing a wide range of materials to wood and wood-substrate surfaces. Built from Type 305 stainless steel, this screw delivers reliable corrosion resistance in demanding environments where standard steel fasteners would degrade. The oversized truss head, Type-17 point, and coarse thread profile work together to produce strong, flush-seated connections in wood framing, trim, and substrate applications - making it a trusted choice for both professional contractors and skilled DIYers.

Key Features

• Type 305 Stainless Steel construction - provides superior corrosion resistance compared to standard steel, making this screw well-suited for outdoor, high-humidity, and moisture-exposed applications where longevity matters
• Truss head with 0.374 in. head diameter - the wide, low-profile head distributes clamping force over a larger surface area, reducing the risk of material pull-through and delivering a clean, finished appearance
• #2 square drive - reduces cam-out during installation compared to Phillips drive, giving you better torque transfer and more control when driving the screw by hand or with a power tool
• Type-17 point - the self-drilling tip cuts into wood fibers cleanly, reducing splitting and making installation faster, especially in hardwood or dense wood-substrate materials
• Coarse thread pattern - aggressive threading bites into wood quickly and holds firmly, creating a strong, vibration-resistant connection in structural and finish applications
• #8 screw diameter, 1" length - a compact size ideal for attaching thin materials, trim, or wood-substrate panels where a longer or larger fastener would protrude or over-penetrate

Why This Product

• Built for moisture-exposed and outdoor wood connections - the Type 305 stainless steel composition resists rust and oxidation in wet, coastal, or chemically active environments where carbon steel fasteners fail prematurely
• Truss head geometry solves the pull-through problem - the enlarged 0.374 in. head diameter spreads load across a broader contact zone, making this screw the right choice when securing softer or thinner wood-substrate materials that could otherwise strip or pull through
• Type-17 self-drilling point eliminates pre-drilling in most wood applications - the cutting tip bores through wood fiber on contact, speeding up installation and reducing the need for a separate drill bit step, though predrilling is recommended depending on the specific substrate
• Square drive reduces installer fatigue and bit slippage - the #2 square drive recess provides a positive engagement between bit and screw, meaning fewer stripped heads and more consistent results across high-volume fastening tasks

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #8
• Length: 1 in.
• Head Diameter: 0.374 in.
• Head Type: Truss Head
• Drive Type: #2 Square
• Thread Type: Coarse Threads
• Point Type: Type-17 Point
• Material: Type 305 Stainless Steel
• Country of Origin: Taiwan

Available Pack Options

• S08C100TSC: 100 Pk
• S08C100TSM: 1000 Pk
• S08100TSBC: 2000 Pk

Frequently Asked Questions

What materials can this truss-head screw be used with?

This screw is ideal for securing all materials to wood or wood-substrate materials. It works well in applications where a low-profile, wide-bearing-surface head is needed to prevent pull-through. Predrilling is recommended depending on the specific substrate being used.

Why choose a Type-17 point over a standard sharp point?

The Type-17 point features a cutting tip that slices through wood fibers rather than simply pushing them apart. This reduces the likelihood of splitting the material during installation and allows the screw to start and drive more cleanly, especially in dense or dry wood.

What is the advantage of a #2 square drive on this screw?

A #2 square drive creates a tighter, more secure fit between the bit and the screw head compared to a Phillips drive. This means less cam-out - where the bit slips out of the recess under torque - resulting in fewer damaged screw heads and a faster, more efficient installation process. The replacement bit model for this drive is the BIT2S-2.

Is 305 stainless steel appropriate for outdoor or pressure-treated lumber applications?

Type 305 stainless steel offers strong corrosion resistance, making it a solid choice for outdoor environments and applications exposed to moisture. It is well-suited for use with wood-substrate materials in settings where rust resistance is a priority, such as decking, exterior trim, and similar applications subject to weathering.