S-91781A450 5/16"-18 x 5/8" 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 for extended service life in harsh environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable performance under heavy loads
• Precision threading with Class 2A fit and UNC coarse threads ensuring secure fastening and easy installation
• Optimized head design featuring standard 82° countersink angle for flush mounting and reduced surface protrusion
• Full threading capability providing maximum grip length and uniform stress distribution across the entire fastener
• Regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
• Versatile drive compatibility with slotted head design accommodating standard screwdrivers for convenient installation and removal

Professional Applications & Engineering Value

These 18-8 stainless steel flat head screws deliver critical performance advantages in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The combination of passivated finish and 80000 psi tensile strength ensures long-term integrity in applications exposed to moisture, chemicals, and mechanical stress. The UNC coarse threading with Class 2A fit provides excellent engagement in various materials while the 82° countersink angle creates seamless flush mounting for applications requiring smooth surfaces. Ideal for machinery assembly, electrical enclosures, and structural components, these fully threaded slotted screws offer engineers a compliant solution that meets rigorous ASME B18.6.3 standards while addressing common challenges of fastener failure and environmental degradation.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread spacing (5/16"-18), these flat head screws maintain consistent thread diameter of 0.313" and overall length of 5/8". Compliance with ASME B18.6.3 ensures dimensional accuracy and performance reliability. The product fully meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) environmental regulations, confirming adherence to the latest international standards for hazardous substance restrictions and chemical safety.