S-91781A079 2-56 x 3/8" 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 delivering 80,000 psi tensile strength and Rockwell B80 hardness for reliable performance under stress
• Precision thread engagement with Class 2A fit and UNC coarse threads ensuring secure fastening and vibration resistance
• Optimal flush mounting featuring standard 82° countersink angle for seamless surface integration in precision assemblies
• Full-threaded design providing maximum grip length and load distribution across the entire fastener
• Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and performance reliability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

This 2-56 UNC Flat Head Slotted Screw delivers critical engineering solutions where corrosion resistance and flush surface requirements are paramount. The 18-8 stainless steel material combined with passivated finish provides exceptional protection against oxidation and chemical exposure, making it ideal for marine, food processing, and electronic enclosure applications. The standard 82° countersink angle ensures perfect flush mounting in precision machinery, while the Class 2A thread fit and UNC coarse threading facilitate quick assembly and maintain secure fastening in high-vibration environments. These flat head fasteners are engineered to solve common industrial challenges including space constraints, surface damage prevention, and long-term reliability in demanding operating conditions.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerance per UNC standards with 3/8" length and fully threaded configuration. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety, ensuring suitability for global industrial applications and environmental standards.