S-91802A572 1/4"-20 x 4" ASME B18.6.3 Stainless Steel Phillips Oval Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Superior mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable performance under load
• Optimized installation efficiency featuring Phillips No. 3 drive and standard oval head profile for secure, flush mounting
• Enhanced thread engagement with UNC coarse threading and Class 2A fit ensuring consistent fastening in various materials
• Reduced material stress through partially threaded design that minimizes cracking in brittle substrates
• Wide compatibility with 82° countersink angle matching standard chamfered holes for seamless integration
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and international environmental standards

Professional Applications & Engineering Value

This passivated 18-8 stainless steel oval head screw delivers critical performance advantages for industrial applications where corrosion resistance and structural integrity are paramount. The partially threaded design concentrates engagement strength while reducing stress concentrations in assembled components. With its UNC coarse thread configuration and Class 2A fit, this flat head screw provides reliable fastening in metal fabrication, machinery assembly, and outdoor equipment where vibration resistance is essential. The oval head profile with 82° countersink angle creates a finished appearance while the Phillips No. 3 drive ensures efficient installation in high-volume production environments. Engineered to withstand demanding conditions, these screws maintain their mechanical properties in chemical processing, marine applications, and food processing equipment where stainless steel screws must resist both corrosion and mechanical stress.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse threading (1/4"-20) ensuring consistent performance across applications. This 4-inch partially threaded screw complies with ASME B18.6.3 mechanical and dimensional specifications. The product meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) regulations regarding chemical safety, making it suitable for global industrial supply chains and environmentally conscious manufacturing operations.