S-90288A550 1/4"-20 x 2" ASME B18.6.3 Tamper-Resistant One-Way-Drive Stainless Steel Round Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B96 hardness for reliable load-bearing performance
• Secure tamper-resistant installation featuring one-way drive style to prevent unauthorized removal in sensitive applications
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring vibration resistance and quick assembly
• Full-length threading provides consistent fastening strength along the entire 2" length for uniform clamping force
• Rounded head design offers smooth surface profile reducing snagging risks while maintaining structural integrity
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 1/4"-20 UNC threaded rounded head screws deliver critical performance advantages in machinery assembly, electrical enclosures, and structural frameworks. The 18-8 stainless steel material combined with passivated surface treatment creates a protective oxide layer that significantly extends service life in corrosive environments including chemical processing, marine applications, and outdoor installations. The coarse thread configuration ensures rapid installation and superior resistance to vibration loosening, while the one-way drive system provides tamper-resistant security for public infrastructure and access-controlled areas. With full threading along the 2" length, these screws maintain consistent clamping force across joined materials, preventing joint failure in high-stress applications.

Specification Summary & Compliance

This rounded head screw features precise Class 2A thread fit tolerances with UNC coarse threading (1/4"-20) and right-hand thread direction. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant regarding substance restrictions, ensuring environmental regulatory adherence for global industrial supply chains.