S-93085A107 4-40 x 5/16" FF-S-92, QQ-P-35, MS24693-C3, NASM24693, SAE AMS2700 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction for extended service life in harsh environments
• Exceptional tensile strength rated at 70,000 psi ensures reliable performance under high-stress applications
• Precision Class 2A thread fit provides consistent engagement and reduces cross-threading risks during installation
• Optimized Phillips drive design with No. 1 size offers secure tool engagement and efficient installation
• 100° countersink angle enables flush mounting for clean, professional finishes in assembled products
• Full threading along the 5/16" length maximizes grip strength and load distribution
• Comprehensive regulatory compliance including RoHS 3 and REACH ensures environmental and safety standards are met

Professional Applications & Engineering Value

These 4-40 UNC flat head screws deliver critical engineering advantages in demanding industrial applications. The passivated 18-8 stainless steel construction provides exceptional resistance to corrosion and chemical exposure, making them ideal for aerospace, electronics, and marine environments where material integrity is paramount. The coarse UNC thread profile combined with Class 2A thread fit ensures rapid installation and reliable fastening in various substrates, reducing assembly time while maintaining vibration resistance. The 100° countersink angle and flat head design allow for seamless surface integration, eliminating protrusions in precision equipment and machinery. With 70,000 psi tensile strength and Rockwell B70 hardness, these screws withstand significant mechanical stress while maintaining their structural integrity through repeated thermal cycles and operational demands.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse threading specifications. Complies with multiple industry standards including Fed. Spec. FF-S-92, QQ-P-35, MS24693-C3, NASM24693, and SAE AMS2700. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance for restricted substance management. Features consistent 5/16" length with fully threaded design and standardized 100° countersink angle for uniform performance across applications.