S-91771A855 1/2"-13 x 3/4" 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, ensuring long-term reliability in harsh industrial environments
• Exceptional load-bearing capacity with 80,000 psi tensile strength and Rockwell B80 hardness for demanding applications
• Precision thread engagement through Class 2A thread fit and UNC coarse threading, providing secure fastening and vibration resistance
• Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced installation efficiency with Phillips #4 drive system, allowing for quick assembly with standard tools
• Full-thread coverage along the 3/4" length maximizes grip strength and distribution across connected materials
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

These 1/2"-13 UNC flat head screws deliver critical performance advantages for industrial assembly challenges. The passivated 18-8 stainless steel construction provides exceptional corrosion resistance, making them ideal for applications exposed to moisture, chemicals, or outdoor elements. The combination of 80,000 psi tensile strength and Rockwell B80 hardness ensures reliable performance under heavy loads and vibration, while the fully threaded design with coarse UNC threading offers superior pull-out resistance in various materials. The 82° countersink angle and flat head profile create flush surfaces critical for machinery, equipment manufacturing, and structural applications where protrusions are unacceptable. These Phillips #4 drive screws streamline installation processes while maintaining the precision required for industrial-grade fastening solutions.

Specification Summary & Compliance

This flat head 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, ensuring dimensional accuracy and performance reliability. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations, confirming environmental responsibility and safety standards. With right-hand threading and fully threaded design across the 3/4" length, these screws deliver standardized performance for industrial applications requiring dependable fastening solutions.