S-97124A139 4-40 x 1/2" ASME B18.6.3 Aluminum Phillips Flat Head Screws

Key Features & Benefits at a Glance

• High-strength aluminum construction provides excellent durability with 50,000 psi tensile strength while maintaining lightweight properties ideal for weight-sensitive applications
• Precise Class 2A thread fit ensures smooth installation and reliable fastening performance in demanding industrial environments
• Standard 82° countersink angle allows for flush mounting with common countersunk holes, creating clean, professional finishes
• Fully threaded design offers maximum grip length and holding power throughout the entire screw length
• Rockwell B55 hardness rating delivers superior resistance to wear and deformation under load conditions
• Phillips drive system provides secure tool engagement and efficient installation with standard driving tools
• Comprehensive regulatory compliance meets ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

These 4-40 UNC flat head Phillips screws manufactured from 2024 aluminum address critical engineering requirements where weight reduction must not compromise mechanical performance. The coarse UNC thread pattern combined with Class 2A thread fit ensures reliable fastening in vibration-prone environments while preventing cross-threading during assembly. The 82° countersink angle and flat head profile create seamless surface finishes in aerospace components, electronic enclosures, and precision machinery where aerodynamic or aesthetic considerations are paramount. With 50,000 psi tensile strength and Rockwell B55 hardness, these screws maintain structural integrity in applications subject to thermal cycling and mechanical stress, making them ideal for industrial assembly scenarios demanding both lightweight properties and dependable fastening performance.

Specification Summary & Compliance

These flat head screws feature precise 4-40 UNC coarse threads with Class 2A thread fit tolerances per ASME standards. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance requirements. The products are fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for hazardous substance restrictions. The 1/2" length and fully threaded configuration ensure consistent performance across industrial applications requiring reliable fastening solutions.