S-91781A059 0-80 x 1/2" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments
• Precise thread engagement with Class 2A fit and UNF fine threading for secure fastening and vibration resistance in critical assemblies
• High mechanical strength delivering 80,000 psi tensile strength and Rockwell B80 hardness for demanding industrial applications
• Optimal flush mounting with standard 82° countersink angle and flat head design for smooth surface finishes
• Reliable drive performance through slotted drive style, providing straightforward installation with standard tools
• Full threading coverage across the 1/2" length for maximum grip and load distribution
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards (RoHS 3, REACH)

Professional Applications & Engineering Value

These 0-80 UNF flat head screws deliver exceptional engineering value for precision assemblies requiring reliable fastening solutions. The combination of 18-8 stainless steel material and passivated finish provides superior corrosion resistance, making them ideal for electronics, aerospace components, and medical devices where environmental exposure is a concern. The fine UNF threading with Class 2A fit ensures precise engagement in thin materials and delicate components, preventing stripping while maintaining consistent clamping force. The 82° countersink angle and flat head profile enable seamless surface integration, eliminating protrusions in applications where aerodynamics or aesthetics are critical. These slotted drive screws offer reliable performance in automated assembly systems while maintaining compatibility with manual installation processes.

Specification Summary & Compliance

This flat head screw features precise dimensional control with Class 2A thread fit tolerance and UNF (Unified National Fine) thread form in 0-80 size. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance standards. The product meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) regulations regarding chemical safety. Threading is fully formed along the 1/2" length with standard 82° countersink geometry, ensuring consistent performance across industrial applications.