S-92210A115 4-40 x 1" 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 for long-lasting performance in harsh environments
• Superior thread engagement with Class 3A fit and UNC coarse threads ensuring reliable, vibration-resistant connections
• High-strength durability delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding industrial applications
• Optimized flush mounting with standard flat head profile and 82° countersink angle for seamless surface integration
• Secure installation control through hex drive design providing positive torque transmission during assembly
• Full thread coverage along the 1" length for maximum grip and load distribution across connected materials
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental directives including RoHS 3 and REACH

Professional Applications & Engineering Value

These 4-40 UNC flat head screws deliver critical engineering advantages where corrosion resistance and precise flush mounting are paramount. The 18-8 stainless steel composition with passivated finish provides exceptional protection against chemical exposure and atmospheric corrosion, making them ideal for marine, food processing, and outdoor equipment applications. The Class 3A thread fit with coarse UNC threading ensures rapid assembly while maintaining vibration resistance in dynamic load conditions. The combination of 70,000 psi tensile strength and fully threaded design distributes clamping forces evenly, preventing material deformation in thin-section assemblies. These characteristics make these flat head screws particularly valuable in aerospace components, electronic enclosures, and precision machinery where reliability and regulatory compliance are non-negotiable.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 specifications with Class 3A thread fit tolerance for precision engagement. Features UNC coarse threads (4-40) with right-hand direction and standard 82° flat head profile. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. Mechanical properties include Rockwell B55 hardness and 70,000 psi tensile strength for consistent performance in industrial fastening applications.