S-93085A109 4-40 x 7/16" FF-S-92, QQ-P-35, MS24693-C5, NASM24693, SAE AMS2700 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior Corrosion Resistance: Passivated 18-8 Stainless Steel construction ensures excellent durability in harsh environments, reducing replacement frequency and maintenance costs.
• High Tensile Strength & Hardness: With a tensile strength of 70,000 psi and Rockwell B70 hardness, this screw provides reliable, long-lasting fastening under high-stress conditions.
• Effortless Installation & Secure Fit: The Phillips No. 1 drive and Class 2A thread fit enable quick, precise assembly with reduced risk of stripping and consistent clamping force.
• Optimized for Flush Mounting: The standard flat head with a 100° countersink angle allows for a smooth, unobtrusive finish in countersunk applications.
• Full Thread Engagement: Fully threaded coarse UNC design ensures maximum grip and load distribution along the entire length, enhancing joint integrity.
• Broad Regulatory Compliance: Meets multiple industrial standards including Fed. Spec. FF-S-92, MS24693-C5, and RoHS 3, ensuring quality and safety for regulated projects.
• Versatile Coarse Threading: 4-40 UNC coarse threads provide faster installation and better performance in materials where fine threads may be less effective.

Professional Applications & Engineering Value

This 4-40 UNC flat head screw is engineered to address common industrial challenges such as vibration loosening and environmental degradation. Constructed from passivated 18-8 stainless steel, it offers exceptional resistance to corrosion and oxidation, making it ideal for applications in electronics, aerospace, and marine equipment where moisture and chemicals are prevalent. The Phillips drive and coarse thread spacing facilitate rapid assembly without compromising on holding power, while the 100° countersink angle ensures a seamless fit in pre-drilled holes, preventing protrusion and improving aerodynamic or aesthetic profiles. Fully threaded for uniform stress distribution, these screws are a reliable choice for securing panels, chassis, and components that demand both high tensile strength and compliance with stringent specifications like Fed. Spec. FF-S-92 and NASM24693.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 2A thread fit for consistent assembly tolerance and UNC coarse threading per inch system requirements. It conforms to key manufacturing and material specifications such as Fed. Spec. FF-S-92, QQ-P-35, MS24693-C5, NASM24693, and SAE AMS2700. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global supply chains.