S-90920A544 1/4"-20 x 1 1/4" ASME B18.6.3 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Enhanced torque transmission through T27 Torx drive design, reducing cam-out and tool slippage during installation
• High tensile strength rating of 60,000 psi ensures reliable performance under substantial mechanical loads
• Optimized flush mounting with standard 82° countersink angle for seamless surface integration
• Precision thread engagement with Class 2A UNC coarse threads providing excellent assembly efficiency
• Full threading design delivers maximum grip length and uniform stress distribution along the entire fastener
• Regulatory compliance assurance meeting both industry standards and environmental regulations

Professional Applications & Engineering Value

These zinc-plated steel flat head screws with T27 Torx drive are engineered to address critical industrial fastening challenges where vibration resistance, corrosion protection, and reliable installation are paramount. The 1/4-20 UNC coarse threading combined with Class 2A thread fit ensures quick assembly while maintaining precise tolerances in machinery, equipment manufacturing, and structural applications. The 82° countersink angle provides optimal flush mounting in predrilled surfaces, eliminating protrusions that could interfere with moving components. The zinc plating offers essential protection against oxidation in environments with moderate exposure to moisture and chemicals, while the fully threaded design maximizes holding power across the entire 1 1/4" length, making these flat head screws ideal for demanding applications requiring both aesthetic cleanliness and mechanical reliability.

Specification Summary & Compliance

These fasteners feature Class 2A thread fit with UNC coarse thread spacing and right-hand threading, manufactured to ASME B18.6.3 specifications for dimensional accuracy and performance consistency. The products are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they meet current industry standards for restricted substances while maintaining the specified 60,000 psi tensile strength rating.