S-91771A295 12-24 x 7/8" 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, ideal for harsh environments and long-term outdoor applications.
• Exceptional mechanical strength offering 80,000 PSI tensile strength and Rockwell B80 hardness for reliable performance under high-stress conditions.
• Precision thread engagement with Class 2A fit and UNC coarse threads ensuring easy installation and secure fastening in various materials.
• Optimized flush mounting featuring a standard 82° countersink angle and flat head design for a smooth, professional finish in countersunk holes.
• Enhanced drive efficiency with Phillips No. 3 drive style providing good torque transfer and reducing the risk of cam-out during installation.
• Full threading along the 7/8" length maximizes grip and holding power across the entire fastener engagement area.
• Regulatory compliance assurance meeting ASME B18.6.3 specifications, RoHS 3, and REACH, ensuring safety and environmental standards are met.

Professional Applications & Engineering Value

These 12-24 UNC flat head screws are engineered to address common industrial challenges such as vibration loosening and corrosive degradation. The passivated 18-8 stainless steel material provides excellent resistance to rust and chemical exposure, making them suitable for marine equipment, food processing machinery, and outdoor structural assemblies. The coarse UNC thread and Class 2A thread fit ensure quick installation and reliable holding power in soft metals and plastics, reducing assembly time and maintenance needs. The 82° countersink angle and flat head profile allow for seamless integration into tapered holes, preventing protrusion and improving aerodynamic or aesthetic surfaces. With a high tensile strength of 80,000 PSI, these screws maintain integrity in dynamic load applications, offering engineers a dependable solution for critical fastening tasks.

Specification Summary & Compliance

This product adheres to Class 2A thread fit tolerances per UNC standards, ensuring dimensional accuracy and interchangeability. Manufacturing complies with ASME B18.6.3 specifications for consistent quality and performance. Environmental and safety regulations are met, including RoHS 3 (2015/863/EU) compliance for restricted hazardous substances and REACH (EC 1907/2006) compliance for chemical safety, confirming suitability for global industrial markets.