Simpson #8 x 1-1/2" Truss-Head Screw in 305 Stainless Steel is a high-performance 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 for demanding interior and exterior applications where standard steel fasteners would fall short. The oversized truss head, coarse threads, and Type-17 point work together to provide a fast, secure, and split-resistant installation in wood framing, sheathing, and composite substrates.

Key Features

• Type 305 Stainless Steel - provides strong resistance to rust and corrosion, making this screw well-suited for outdoor, high-humidity, and moisture-exposed environments where carbon steel fasteners would degrade
• Truss Head with 0.374" head diameter - the wider, low-profile head spreads the load across a larger surface area, reducing the risk of pull-through when fastening thin or soft materials
• #2 Square Drive - delivers superior bit engagement compared to Phillips drives, reducing cam-out and improving installation speed and control, especially in high-torque applications
• Type-17 Point - the self-starting, auger-style tip cuts cleanly into wood fibers, reducing splitting and allowing faster penetration without requiring a pilot hole in many substrates
• Coarse Threads - aggressive thread pitch bites firmly into wood and wood-composite materials, creating a strong mechanical hold that resists withdrawal forces
• #8 x 1-1/2" Size - a versatile screw length and gauge suited to a broad range of light-duty structural and non-structural fastening tasks in wood construction

Why This Product

• Corrosion resistance where it counts - Type 305 stainless steel construction means this screw holds up in damp, coastal, or chemically exposed environments without rusting or weakening over time, unlike plain-steel alternatives
• Engineered for wood and wood-substrate fastening - the combination of a Type-17 point, coarse threads, and truss head makes this screw specifically optimized for achieving a clean, secure bite in wood framing and composite materials
• Reduced cam-out and faster driving - the #2 square drive interface keeps the bit seated under load, reducing slippage and driver wear during high-volume installation work
• Oversized head for secure material retention - the wider truss head bears down across a broader contact zone, providing a more reliable hold on surface materials and reducing the chance of the fastener sinking through thin substrates

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #8
• Length: 1-1/2 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

• S08C150TSC: 100 Pk
• S08C150TSM: 1000 Pk
• S08150TSBC: 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. The Type-17 point and coarse threads are specifically designed to grip wood and composite substrates effectively. Predrilling is recommended depending on the substrate to prevent splitting.

Do I need to predrill before installing this screw?

Predrilling is recommended depending on the substrate. The Type-17 auger point helps reduce splitting and allows the screw to self-start in many wood applications, but harder or denser materials may benefit from a pilot hole to ensure a clean installation.

What drive bit do I need for this screw?

This screw uses a #2 square drive. Simpson offers a compatible replacement bit under model BIT2S-2. The square drive interface is designed to minimize cam-out during driving, providing better torque transfer and control compared to standard Phillips drive screws.

Why is a truss head used on this screw instead of a flat or pan head?

The truss head features a wider head diameter of 0.374 in. and a low-profile dome shape that distributes clamping load over a larger surface area. This makes it especially effective at preventing pull-through when fastening thinner or softer surface materials to wood or wood-substrate bases.