S-92210A112 4-40 x 5/8" ASME B18.3 Stainless Steel Hex Drive 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
• Precise installation and removal enabled by hex drive design with 1/16" drive size for secure tool engagement
• Reliable thread engagement with Class 3A thread fit ensuring consistent performance in critical assemblies
• High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Optimal flush mounting with standard 82° countersink angle and flat head design for smooth surface finishes
• Enhanced assembly efficiency through fully threaded UNC coarse thread design for faster installation
• Industry compliance assurance meeting ASME B18.3 specifications and environmental regulations

Professional Applications & Engineering Value

These 4-40 UNC flat head screws deliver exceptional engineering value across industrial applications where corrosion resistance and mechanical reliability are paramount. The 18-8 stainless steel composition combined with passivated finish provides superior protection against oxidation and chemical exposure, making them ideal for electronics enclosures, precision instruments, and marine equipment. The hex drive design ensures positive torque transmission during installation, while the Class 3A thread fit maintains consistent clamping force in vibration-prone environments. The 82° countersink angle and flat head profile facilitate seamless integration into machined surfaces, eliminating protrusions in sensitive assemblies. These fully threaded coarse thread screws offer rapid installation in time-sensitive manufacturing operations while maintaining the structural integrity required for critical fastening applications.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse thread specifications (4-40 thread size, 5/8" length). Compliant with ASME B18.3 manufacturing standards ensuring dimensional accuracy and performance reliability. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, confirming adherence to international regulatory standards for hazardous substance restrictions.