S-91790A110 4-40 x 1/2" ASME B18.6.3 Stainless Steel Slotted Oval Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• Exceptional mechanical strength with a tensile strength of 80,000 psi and Rockwell B80 hardness for secure, vibration-resistant fastening in demanding applications.
• Precise and reliable threading with Class 2A fit and UNC coarse thread spacing, enabling quick assembly and reduced risk of cross-threading.
• Optimized oval head design provides a flush, finished appearance when installed, ideal for applications where a smooth surface is critical.
• Broad industry compliance meeting ASME B18.6.3 specifications, ensuring dimensional accuracy and interchangeability with other standard components.
• Environmental and safety assurance through RoHS 3 and REACH compliance, making them suitable for regulated industries and global supply chains.
• Versatile drive compatibility with a standard slotted drive, allowing for easy installation using common hand tools.

Professional Applications & Engineering Value

These 4-40 UNC oval head slotted screws are engineered to address common industrial challenges such as component loosening under vibration and exposure to corrosive elements. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to rust and chemical degradation, making them ideal for industrial machinery, electronic enclosures, and automotive assemblies. The coarse thread spacing and Class 2A thread fit ensure rapid installation and high clamping force, reducing assembly time and improving production efficiency. Their oval head profile sits flush with the surface, preventing snagging and enhancing safety in moving parts. These features make them a reliable choice for engineers seeking durable, compliant flat head screws that maintain integrity in rigorous operating conditions.

Specification Summary & Compliance

This product adheres to precise dimensional standards with a Class 2A thread fit and UNC coarse thread specification, ensuring consistent performance and interchangeability. Manufacturing and quality are governed by ASME B18.6.3, confirming reliability in mechanical fastening applications. Additionally, these screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting their use in environmentally conscious and globally regulated markets.