S-96640A337 4-40 x 7/16" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide coated 18-8 Stainless Steel, ideal for harsh industrial environments
• High tensile strength of 80,000 psi ensures reliable, long-lasting fastening under demanding loads
• Precise Class 2A thread fit provides smooth installation and consistent engagement in coarse UNC threads
• Fully threaded design maximizes grip and holding power across the entire 7/16" length
• Standard 100° countersink angle allows for a flush, professional finish in countersunk applications
• Phillips drive (No. 1 size) offers familiar, efficient installation with standard tools
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards

Professional Applications & Engineering Value

These 4-40 UNC flat head screws are engineered to address critical challenges in precision assemblies where corrosion resistance and mechanical integrity are paramount. The Black-Oxide 18-8 Stainless Steel construction provides an added layer of protection against oxidation and chemical exposure, making them suitable for electronics, automotive, and marine applications. The combination of 80,000 psi tensile strength and Rockwell B80 hardness ensures that these Phillips machine screws maintain clamp load and resist stripping, even in high-vibration environments. The fully threaded coarse UNC design with a Class 2A fit allows for quick, reliable fastening in a variety of materials, reducing installation time and improving assembly line efficiency.

Specification Summary & Compliance

These screws feature a 4-40 UNC coarse thread with Class 2A thread fit for standard dimensional accuracy, and a 100° countersink angle on a flat head profile. Manufactured to meet ASME B18.6.3 specifications, they are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring they are free of hazardous substances and safe for industrial use.