S-96640A333 4-40 x 3/16" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Corrosion-resistant performance with Black-Oxide 18-8 Stainless Steel, ideal for humid or demanding industrial environments
• High tensile strength of 80,000 psi ensures reliable load-bearing capacity and joint integrity under stress
• Rockwell B80 hardness provides excellent wear resistance and reduces thread deformation during installation
• Full threading design allows for maximum grip and uniform clamping force across the entire fastener length
• Precise Class 2A thread fit enables smooth assembly and reduces cross-threading risks in high-volume production
• 100° countersink angle with standard flat head ensures flush mounting and clean aesthetic finishes
• Phillips No. 1 drive offers widespread tool compatibility and efficient installation in confined spaces

Professional Applications & Engineering Value

These 4-40 UNC flat head screws in Black-Oxide 18-8 Stainless Steel address critical challenges in precision assembly and machinery. The coarse UNC thread and fully threaded design provide rapid installation and vibration resistance, making them ideal for electronics enclosures, automotive components, and industrial equipment where disassembly is infrequent. The Black-Oxide finish enhances corrosion protection without sacrificing conductivity, while the Phillips drive ensures compatibility with standard tools, reducing downtime. Engineered to maintain clamp load under dynamic conditions, these screws deliver long-term reliability in applications exposed to moisture, temperature variations, and mechanical stress.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit tolerances per UNC standards, ensuring consistent interchangeability. Manufacturing and dimensional compliance meet ASME B18.6.3 specifications for flat head machine screws. The product is verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting use in regulated industries and global supply chains. All dimensions are in the inch system, with thread size 4-40, length 3/16", and right-hand threading for standard applications.