S-97124A128 4-40 x 1/4" ASME B18.6.3 Aluminum Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional strength-to-weight ratio with 2024 aluminum construction and 50,000 psi tensile strength for reliable performance in demanding applications
• Precise Class 2A thread fit ensures smooth installation and secure fastening with UNC coarse threading for reduced cross-threading risk
• Optimized 82° countersink angle provides flush mounting and clean aesthetic finish in precision assemblies
• Full compliance with ASME B18.6.3 standards guarantees dimensional accuracy and interchangeability across industrial applications
• Rockwell B55 hardness rating delivers excellent wear resistance and durability for extended service life
• Environmental regulation compliance with RoHS 3 and REACH ensures safe usage in regulated industries and global markets
• No. 1 Phillips drive design enables efficient installation with standard tools while maintaining head integrity

Professional Applications & Engineering Value

These 2024 aluminum flat head screws with 4-40 UNC coarse threading provide critical solutions for weight-sensitive applications requiring high strength and corrosion resistance. The fully threaded design and Class 2A thread fit ensure maximum engagement and vibration resistance in electronic enclosures, aerospace components, and precision machinery. The 82° countersink angle allows for flush mounting in tapered recesses, eliminating protrusions while maintaining structural integrity. Manufactured to ASME B18.6.3 specifications, these screws deliver consistent performance in automated assembly environments where dimensional precision and reliability are paramount. The combination of 50,000 psi tensile strength and Rockwell B55 hardness makes them ideal for applications subject to mechanical stress while maintaining lightweight advantages over steel alternatives.

Specification Summary & Compliance

These flat head Phillips screws feature precise Class 2A thread fit per UNC standards with 4-40 thread size and 1/4" length. Manufacturing complies with ASME B18.6.3 dimensional specifications, ensuring interchangeability and reliability. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming restriction of hazardous substances for global industrial applications.