Simpson #10 x 2-1/2" Square Drive Self-Drilling Bugle-Head Screw in 410 Stainless Steel is a high-performance fastener engineered for attaching wood, plywood, and OSB panels to steel studs with speed and precision. The self-drilling point eliminates the need for pre-drilling, saving time on the job site, while the bugle head profile sinks flush with the work surface for a clean, professional finish. Built from Type 410 stainless steel with an additional corrosion-protective coating, this screw is well-suited for demanding interior and exterior framing applications where moisture resistance and long-term holding power matter most.

Key Features

• Type 410 stainless steel construction with corrosion-protective coating - delivers reliable rust resistance in moisture-prone environments and extends the working life of the fastener in both indoor and outdoor framing applications.
• Self-drilling drill point - bores through wood and into steel studs without a pilot hole, speeding up installation and reducing the number of tools needed on site.
• Bugle head profile - countersinks flush with the work surface as it drives, preventing surface tearing on wood panels and OSB for a smooth, professional result.
• #2 square drive - provides excellent bit engagement and reduces cam-out compared to phillips drive, giving the installer more control and consistent torque transfer.
• Tapping screw threads at 16 TPI - thread into steel studs with a secure mechanical grip that resists pull-out and movement over time.
• 2-1/2" length with a 0.340" head diameter - sized for solid penetration through sheathing panels and into steel framing members, maximizing structural connection strength.

Why This Product

• The self-drilling point and tapping threads work together to eliminate pre-drilling steps, making this screw a practical choice when fastening OSB or plywood sheathing to light-gauge steel stud framing on time-sensitive projects.
• The combination of Type 410 stainless steel and an added corrosion-resistant coating means this fastener holds up in conditions where standard carbon steel screws would corrode prematurely - such as damp framing cavities or coastal construction environments.
• The #2 square drive is compatible with standard square-drive bits commonly found on job sites, reducing specialty tooling requirements while providing more positive engagement and less slipping during high-volume driving.
• The bugle head geometry distributes clamping force across the panel face, reducing the risk of surface puncture or blowout on softer wood composites like OSB, which is critical when maintaining panel shear capacity.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length: 2-1/2 in.
• Head Diameter: 0.340 in.
• Drive Type: #2 Square
• Head Type: Bugle Head
• Thread Type: Tapping Threads
• TPI: 16
• Point Type: Drill Point
• Material: Type 410 Stainless Steel
• Country of Origin: Taiwan

Available Pack Options

• F10T250BDC: 100 Pk
• F10T250BDM: 1000 Pk
• F10T250BDB: 2000 k

Frequently Asked Questions

What materials can this screw fasten together?

This screw is designed for fastening wood, plywood, and OSB panels to steel studs. The self-drilling point and tapping threads allow it to cut through wood-based sheathing and thread directly into light-gauge steel framing without a pilot hole.

What drive bit does this screw require?

This screw uses a #2 square drive. Simpson recommends replacement bit BIT2S-2-R2 for use with these screws, ensuring a secure fit and reducing cam-out during installation.

Why is Type 410 stainless steel used for this fastener?

Type 410 stainless steel provides a strong, corrosion-resistant base material suited for framing applications where moisture exposure is a concern. The additional corrosion-protective coating on these screws further enhances their resistance to rust and degradation over time.

Will the bugle head leave a raised surface after installation?

No. The bugle head profile is specifically designed to drive flush with the work surface, eliminating any raised protrusion. This is especially important when fastening OSB or plywood panels where a flush surface is required for subsequent finishing or cladding layers.

Note: Product dimensions and/or thread length may differ from picture. Please see item description for specifications.