S-92949A897 2-56 x 7/8" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh environments
• High torque transmission capability through the hex drive design, preventing stripping during installation
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precise thread engagement with Class 3A thread fit ensuring secure fastening and vibration resistance
• Quick installation in coarse materials thanks to UNC coarse threading and fully threaded design
• Low-profile rounded head design providing smooth surface finish while maintaining structural integrity
• Full regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for quality assurance

Professional Applications & Engineering Value

This 18-8 stainless steel rounded head screw delivers critical performance advantages in demanding industrial applications where corrosion resistance and mechanical reliability are paramount. The combination of 2-56 UNC coarse threading and Class 3A thread fit ensures rapid installation in various materials while maintaining precise tolerances for vibration-prone environments. The hex drive design provides superior torque transmission compared to standard drive types, reducing installation time and preventing fastener damage. The passivated finish significantly enhances the natural corrosion resistance of stainless steel, making these industrial fasteners ideal for electronics enclosures, machinery assemblies, and outdoor equipment where environmental exposure is a concern. With full compliance to ASME B18.3 standards, engineers can specify these screws with confidence for critical applications requiring documented performance characteristics.

Specification Summary & Compliance

This fastener features precision 2-56 UNC coarse threading with Class 3A thread fit for superior engagement and vibration resistance. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance. The screw meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global markets and environmentally conscious applications.