S-90585A120 2-56 x 3/8" ASME B18.3, ASTM F879 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precise Class 3A thread fit ensures secure fastening with minimal vibration loosening in critical assemblies
• Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced installation efficiency through hex drive design providing superior torque transmission and slip resistance
• Full threading coverage along the 3/8" length enables consistent clamping force across the entire engagement area
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global quality and safety requirements

Professional Applications & Engineering Value

These 2-56 UNC flat head screws deliver critical engineering solutions where corrosion resistance and structural integrity are paramount. The 316 Stainless Steel composition with passivated finish provides exceptional protection against chemical exposure and atmospheric corrosion, making them ideal for marine, chemical processing, and food equipment applications. The Class 3A thread fit with coarse UNC threading ensures rapid assembly while maintaining vibration resistance in high-stress environments. The combination of 70,000 psi tensile strength and hex drive design addresses common installation challenges, providing reliable fastening in confined spaces where torque application is critical. These fully threaded screws with standard 82° countersink angle offer consistent performance in precision machinery, electronic enclosures, and structural assemblies requiring flush surface profiles.

Specification Summary & Compliance

Manufactured to precise dimensional tolerances including Class 3A thread fit and head diameter tolerance of -0.029" to 0". Thread specifications conform to UNC coarse thread standards with 2-56 size designation. Complies with ASME B18.3 manufacturing specifications where applicable. Meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) standards for chemical safety. The 316 Stainless Steel material and passivated finish ensure consistent performance across the 3/8" length with full threading coverage.