S-91771A856 1/2"-13 x 1" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance through passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for demanding industrial applications
• Precision thread engagement with Class 2A thread fit and UNC coarse threads providing secure fastening and vibration resistance
• Optimized flush mounting featuring standard 82° countersink angle for seamless surface integration and improved aesthetics
• Enhanced drive efficiency with Phillips No. 4 drive design enabling controlled torque application and reduced cam-out risk
• Full-threaded reliability ensuring maximum grip length and uniform stress distribution across the entire fastener
• 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 applications where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against chemical exposure and environmental degradation, while the fully threaded design ensures maximum load distribution across the entire fastener length. The standard 82° countersink angle facilitates perfect flush mounting in machinery, electronic enclosures, and structural components, eliminating protrusions that could interfere with moving parts or compromise safety. With coarse UNC threading and Class 2A thread fit, these screws offer rapid installation and reliable performance in vibration-prone environments, making them ideal for automotive, marine, and industrial equipment applications requiring durable, maintenance-free fastening solutions.

Specification Summary & Compliance

Manufactured to exacting inch system dimensions with Class 2A thread fit tolerance for precision assembly. Thread specifications conform to 1/2"-13 UNC coarse thread standards with fully threaded design. Compliance includes ASME B18.6.3 mechanical specifications, RoHS 3 (2015/863/EU) environmental directive, and REACH (EC 1907/2006) chemical regulation compliance. The flat head profile maintains standard 82° countersink angle for consistent flush mounting performance across applications.