Simpson #8 x 2-1/4" Square Drive Self-Drilling Fiber-Cement Screw in Type 410 Stainless Steel by Simpson Strong-Tie is engineered for fastening fiber cement siding through furring strips directly to steel studs - delivering reliable, long-lasting holding strength in residential, agricultural, and commercial construction. The ribbed wafer head and drill point work together to seat flush and bite through metal without pre-drilling, saving time and effort on the job site. With 18 threads per inch and a max grip length of 1.801", this fastener is built to handle demanding steel framing applications where a secure, stable connection is critical.

Key Features

• Type 410 Stainless Steel material - can be hardened through heat treatment, giving it the mechanical strength needed to self-drill through metal substrates without stripping or snapping under torque
• Self-drilling drill point - eliminates the need for pre-drilling pilot holes, speeding up fiber cement installation on steel stud framing and reducing tool changes on the job
• #2 Square drive - provides better bit engagement and reduced cam-out compared to Phillips, so fasteners drive cleanly and consistently even in overhead or awkward positions
• Ribbed wafer head with self-countersinking nibs - the low-profile wafer head seats flush against fiber cement surfaces for a clean, finished appearance, while the nibs pull the head down without surface damage
• 18 TPI thread count - fine threading optimized for steel stud applications, maximizing thread engagement through thin metal framing for a secure, vibration-resistant connection
• 1.801" max grip length - provides the holding depth needed to fasten fiber cement and furring strips securely to steel studs in standard wall assembly configurations
• Threaded to within 5/16" of the top of the head - maximizes thread engagement through the full fastener length, pulling materials tightly together for a firm, gap-free installation

Why This Product

• Designed specifically for fastening fiber cement through furring strips to steel studs - this is not a general-purpose screw, but a purpose-built fastener that matches the mechanical demands of this exact assembly, reducing the risk of fastener failure or pull-through
• Type 410 stainless steel combines hardenability with corrosion resistance - making it suitable for both the penetration demands of steel framing and the weathering exposure typical of exterior fiber cement siding applications
• The square drive head design reduces slippage during driving, which is especially valuable when working at heights or in tight framing cavities where bit control is limited
• Simpson Strong-Tie engineering behind this fastener means it is designed to meet the performance requirements of residential, agricultural, and commercial projects - offering confidence in structural fastening applications where consistency matters

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #8
• Length: 2-1/4 in.
• Material: Type 410 Stainless Steel
• Finish: Type 410 Stainless Steel
• Head Type: Ribbed Wafer Head
• Head Diameter: 0.390 in.
• Drive Type: #2 Square
• TPI: 18
• Point Type: Drill Point
• Max. Grip Length: 1.801 in.
• Country of Origin: Taiwan

Available Pack Options

• F08T225WDC: 100 Pk
• F08T225WDM: 1000 Pk
• F08T225WDB: 2500 Pk

Frequently Asked Questions

What application is this screw specifically designed for?

This screw is designed for fastening fiber cement through furring strips to steel studs. It is suited for residential, agricultural, and commercial construction projects where a secure connection between fiber cement siding and steel framing is required.

Does this screw require pre-drilling?

No. The drill point on this fastener is self-drilling, meaning it can penetrate steel framing without a pilot hole. This helps streamline installation and reduces the number of steps required when attaching fiber cement panels to steel studs.

What driver bit is compatible with this screw?

This screw uses a #2 square drive bit. Simpson recommends using a compatible #2 square drive bit - such as model BIT2S-2-R2 - for proper engagement and consistent driving performance.

Is Type 410 stainless steel the same level of corrosion resistance as Type 316 or Type 305?

No. Type 410 stainless steel can be hardened through heat treatment, which gives it the ability to drill through metal. However, it does not offer the same level of corrosion resistance as Type 316 or Type 305 stainless steel. For applications requiring maximum corrosion resistance - such as coastal or highly chemical environments - a higher-grade stainless may be more appropriate.

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