S-91794A539 1/4"-20 x 5/8" ASME B18.6.3 Stainless Steel Fillister Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh environments
• High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Excellent thread engagement through fully threaded UNC coarse thread design, ensuring secure fastening in various materials
• Optimized head design with high, narrow fillister profile providing enhanced clearance and professional appearance
• Precision manufacturing with Class 2A thread fit for consistent installation and reduced risk of cross-threading
• Regulatory compliance meeting ASME B18.6.3 standards and environmental regulations including RoHS 3 and REACH
• Versatile slotted drive allowing compatibility with standard screwdrivers for easy installation and maintenance

Professional Applications & Engineering Value

This 18-8 stainless steel fillister head slotted screw delivers exceptional engineering value in demanding industrial applications where corrosion resistance and mechanical reliability are critical. The combination of passivated finish and stainless steel material provides superior protection against rust and chemical exposure, making it ideal for machinery, electronic enclosures, and outdoor equipment. The high, narrow fillister head profile offers improved clearance in confined spaces while maintaining a professional appearance. With fully threaded UNC coarse threads and Class 2A thread fit, these screws ensure secure fastening in metal, plastic, and composite materials, reducing installation time and preventing loosening under vibration. The 70,000 psi tensile strength and Rockwell B55 hardness provide dependable performance in high-stress applications, from manufacturing equipment to automotive assemblies.

Specification Summary & Compliance

This fastener features precision 1/4"-20 UNC coarse threads with Class 2A thread fit for consistent installation performance. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and quality assurance. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and safety standards for industrial and commercial applications worldwide.