S-90585A135 8-32 x 1 1/8" 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 environments and extended service life
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under high stress
• Precision fit and easy assembly with Class 3A thread fit and UNC coarse threads, ensuring secure fastening and reduced installation time
• Optimized flush mounting featuring a standard flat head with 82° countersink angle for a smooth, seamless surface finish
• Enhanced drive stability provided by the 3/32" hex drive, minimizing cam-out and allowing for high-torque installation
• Full thread engagement along the 1-1/8" length for maximum grip and load distribution across the entire fastener
• Regulatory compliance assurance meeting ASME B18.3 specifications, RoHS 3, and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

These 8-32 UNC flat head screws are engineered to address critical challenges in industrial and marine settings where corrosion resistance and structural integrity are paramount. The 316 Stainless Steel material, combined with a passivated finish, provides excellent protection against chlorides and acidic conditions, reducing maintenance costs and failure risks. The coarse UNC threads and Class 3A fit ensure quick, secure fastening in metals and plastics, while the flat head design with an 82° countersink allows for flush installation in machinery, enclosures, and structural assemblies. Ideal for heavy-duty fastening in chemical processing, offshore equipment, and food-grade machinery, these screws deliver long-term reliability and compliance with stringent industry standards.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including a Class 3A thread fit per UNC standards and head diameter tolerance of -0.048" to 0". Manufacturing and quality are governed by ASME B18.3 specifications (ASTM F879), ensuring consistency and performance. The screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming they are free of restricted substances and safe for various industrial applications.