S-91783A112 4-40 x 5/8" ASME B18.6.3 Stainless Steel Round Head Slotted 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 100,000 psi tensile strength and Rockwell B100 hardness for reliable load-bearing applications
• Precision thread engagement with Class 2A UNC coarse threads ensuring consistent fit and vibration resistance
• Full-threaded design provides maximum grip length and uniform stress distribution across the entire fastener
• Standard slotted drive compatibility with rounded head profile for easy installation using common tools
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards (RoHS 3, REACH)
• Optimized dimensional accuracy with 0.211" head diameter and 5/8" length for precise fit in designed applications

Professional Applications & Engineering Value

This 4-40 UNC rounded head slotted screw delivers critical performance advantages for industrial assembly applications where corrosion resistance and mechanical reliability are paramount. The 18-8 stainless steel composition combined with passivated finish provides exceptional protection against oxidation and chemical exposure, making it ideal for machinery, electronic enclosures, and marine components. The coarse thread spacing and Class 2A thread fit ensure rapid installation and secure fastening in materials where fine threads might strip or fail. With full threading along the entire 5/8" length, engineers benefit from maximum engagement depth and uniform clamping force distribution. These industrial screws solve common fastening challenges in vibration-prone environments while maintaining compliance with rigorous ASME B18.6.3 manufacturing standards.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerance per UNC standards with precise dimensional control including 0.211" head diameter and 5/8" length. Manufacturing complies with ASME B18.6.3 specifications for slotted head machine screws. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, ensuring restricted substance adherence. The right-hand coarse thread spacing and fully threaded design meet industrial requirements for reliable mechanical fastening applications.