S-90920A550 1/4"-20 x 2" ASME B18.6.3 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
• Enhanced torque transmission and reduced cam-out with T27 Torx drive design for secure fastening applications
• Precision Class 3A thread fit ensuring reliable engagement and vibration resistance in critical assemblies
• Maximum holding power through full UNC coarse threading along the entire 2" length for superior grip
• Flush seating capability with 82° countersink angle and standard flat head profile for clean, aerodynamic surfaces
• High mechanical strength with 60,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
• Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

Engineered for demanding industrial fastening applications, these zinc-plated steel flat head screws deliver exceptional performance where vibration resistance and corrosion protection are critical. The combination of Class 3A UNC coarse threads and T27 Torx drive provides superior torque transmission while minimizing stripping in high-stress environments. The 82° countersink angle ensures flush mounting in machinery, automotive assemblies, and structural components where surface profile integrity matters. With full threading along the 2" length, these screws maintain consistent clamping force across the entire engagement area, preventing loosening under dynamic loads. The 60,000 psi tensile strength makes them ideal for heavy-duty applications requiring reliable, long-term fastening solutions in manufacturing, construction, and equipment maintenance.

Specification Summary & Compliance

This 1/4"-20 x 2" flat head screw features precision Class 3A thread fit with UNC coarse thread spacing and right-hand threading. Manufactured to ASME B18.6.3 specifications with Rockwell B70 hardness and 60,000 psi tensile strength. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe industrial use worldwide.