S-92210A120 4-40 x 1 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh industrial environments
• Superior load-bearing capability from 70,000 psi tensile strength and Rockwell B55 hardness, providing reliable performance under high-stress conditions
• Precision thread engagement with Class 3A thread fit and UNC coarse threading, enabling quick installation and vibration-resistant fastening
• Secure drive system featuring hex drive design for maximum torque transfer and reduced stripping during installation
• Optimal flush mounting with standard 82° countersink angle and flat head profile, creating smooth surface finishes in assembled products
• Full-length threading along the entire 1-1/2" length, providing consistent holding power throughout the fastener engagement
• Regulatory compliance assurance meeting ASME B18.3 standards with RoHS 3 and REACH compliance for global market acceptance

Professional Applications & Engineering Value

This 4-40 UNC flat head screw delivers critical engineering advantages for industrial applications where corrosion resistance and high-strength fastening are paramount. The combination of 18-8 stainless steel material with passivated finish provides exceptional protection against chemical exposure and environmental degradation, making these hex drive screws ideal for machinery, electronic enclosures, and marine equipment. The Class 3A thread fit ensures precise engagement with mating components, while the coarse thread spacing facilitates rapid assembly in production environments. The 82° countersink angle and flat head design create seamless surface transitions, essential for applications requiring aerodynamic profiles or smooth operational surfaces. These industrial flat head screws solve common fastening challenges by combining dimensional accuracy with material durability, reducing maintenance frequency and improving overall system reliability.

Specification Summary & Compliance

This fastener maintains precision Class 3A thread fit according to UNC standards with coarse thread spacing for optimal performance. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and quality assurance. The product meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) compliance for chemical safety, ensuring environmental regulatory adherence for global industrial applications.