S-91771A857 1/2"-13 x 1 1/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction for long-lasting performance in harsh environments
• Exceptional tensile strength rated at 80,000 psi ensures reliable fastening in demanding industrial applications
• Precision thread fit with Class 2A tolerance provides consistent engagement and vibration resistance
• Optimized countersink design with 82° angle allows for flush mounting and clean aesthetic finishes
• Full threading along the entire 1-1/4" length maximizes grip strength and load distribution
• Industry-standard compliance with ASME B18.6.3 ensures interchangeability and engineering reliability
• Environmental regulation adherence with RoHS 3 and REACH compliance for sustainable manufacturing practices

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these 1/2"-13 UNC flat head Phillips screws deliver exceptional performance where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides superior protection against oxidation and chemical exposure, making them ideal for marine equipment, food processing machinery, and outdoor construction projects. The coarse UNC thread pattern combined with Class 2A thread fit ensures quick installation and secure fastening in various materials, while the 82° countersink angle creates seamless flush mounting in precision assemblies. These fully threaded screws maintain consistent clamping force across the entire fastener length, preventing joint loosening under vibration and dynamic loads common in manufacturing and infrastructure applications.

Specification Summary & Compliance

This flat head Phillips screw features precision 1/2"-13 UNC coarse threads with Class 2A thread fit tolerance for consistent engagement. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance standards. The fastener meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety, ensuring environmental responsibility and workplace safety compliance.