S-97124A131 4-40 x 5/16" ASME B18.6.3 Aluminum Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional strength-to-weight ratio from 2024 aluminum construction, providing reliable performance while reducing component weight
• Superior corrosion resistance for extended service life in demanding industrial environments
• Precision Class 2A thread fit ensures smooth installation and secure fastening in mating components
• Optimized Phillips No. 1 drive design delivers efficient torque transfer and reduced cam-out during installation
• 82° countersink angle with standard flat head profile enables flush mounting for clean, professional finishes
• Full threading along the 5/16" length provides maximum engagement strength throughout the fastener
• 50,000 psi tensile strength with Rockwell B55 hardness guarantees structural integrity under mechanical stress

Professional Applications & Engineering Value

These 4-40 UNC flat head screws deliver exceptional engineering value across multiple industrial sectors. The 2024 aluminum construction combines lightweight properties with impressive 50,000 psi tensile strength, making these fasteners ideal for aerospace components, electronics enclosures, and precision machinery where weight reduction is critical without compromising structural integrity. The coarse UNC thread pattern with Class 2A fit ensures rapid installation and reliable performance in vibration-prone applications. The standard 82° countersink angle allows for seamless flush mounting in panels and assemblies, while the Phillips drive system provides familiar, efficient installation for maintenance and production teams. These fully threaded screws maintain consistent holding power across the entire 5/16" length, solving common challenges of strip-out and loosening in dynamic industrial environments.

Specification Summary & Compliance

These precision-engineered fasteners feature 4-40 UNC coarse threads with Class 2A tolerance for consistent fit and performance. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The screws are fully compliant with RoHS 3 (2015/863/EU) environmental standards and REACH (EC 1907/2006) regulations, ensuring safe use in regulated industries. The combination of Rockwell B55 hardness and 50,000 psi tensile strength meets rigorous industrial requirements for durability and load-bearing capacity.