S-91802A107 4-40 x 5/16" ASME B18.6.3 Stainless Steel Phillips Oval Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Exceptional tensile strength of 80,000 psi ensures reliable, high-load fastening without failure under stress.
• Rockwell B80 hardness provides excellent durability and resistance to wear, reducing replacement frequency.
• Class 2A thread fit with UNC coarse spacing offers easy installation and secure holding in various materials.
• Fully threaded design maximizes grip and distribution of clamping force along the entire length.
• Phillips drive and oval head profile enable efficient installation with common tools and a flush, professional finish.
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety regulations.

Professional Applications & Engineering Value

These 4-40 UNC oval head Phillips flat head screws are engineered to address critical challenges in industrial assembly, such as vibration loosening and corrosion-induced failure. The passivated 18-8 stainless steel material provides robust protection against rust and chemical exposure, making them ideal for applications in electronics, machinery, and outdoor equipment. The coarse thread spacing and Class 2A thread fit ensure quick, secure fastening in soft metals or plastics, reducing installation time and improving productivity. With a fully threaded design and 82° countersink angle, they deliver consistent clamping force and a smooth surface finish, minimizing protrusion in precision assemblies. These screws are a reliable choice for engineers seeking corrosion-resistant, high-strength fasteners that meet rigorous ASME B18.6.3 standards for performance and safety.

Specification Summary & Compliance

This product features precise Class 2A thread fit and UNC coarse thread spacing, manufactured in accordance with ASME B18.6.3 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. Dimensions include a 5/16" length, 0.212" head diameter, and right-hand threading, supporting consistent performance in industrial fastening applications.