S-91790A120 4-40 x 1" ASME B18.6.3 Stainless Steel Slotted Oval Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 Stainless Steel and passivated finish, ideal for harsh environments and long-term reliability.
• High tensile strength of 80,000 psi ensures secure, durable fastening under significant mechanical stress.
• Rockwell B80 hardness provides excellent wear resistance and maintains thread integrity during installation and use.
• Class 2A thread fit with coarse UNC threading allows for easier, faster assembly while maintaining secure hold.
• Fully threaded design offers maximum grip and consistent clamping force along the entire 1" length.
• Oval head with slotted drive provides a finished appearance and simple installation with standard tools.
• Compliance with ASME B18.6.3 guarantees precise dimensional accuracy and interchangeability in professional applications.

Professional Applications & Engineering Value

These 4-40 UNC Oval Head Slotted Screws are engineered to address common industrial challenges such as corrosion and vibration loosening. Made from 18-8 Stainless Steel with a passivated finish, they resist rust and chemical exposure, making them ideal for machinery, electronics, and outdoor equipment. The coarse UNC threads and Class 2A fit ensure quick, reliable installation in various materials, reducing assembly time while providing strong, vibration-resistant connections. Fully threaded along the 1" length, they deliver uniform stress distribution, preventing joint failure in high-stress applications.

Specification Summary & Compliance

These screws feature a 4-40 UNC thread size with Class 2A thread fit and coarse thread spacing, ensuring precise dimensional tolerances per ASME B18.6.3. They are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming they are free from hazardous substances and suitable for global industrial use.