S-91794A108 4-40 x 3/8" ASME B18.6.3 Stainless Steel Fillister Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish for long-lasting performance in harsh environments.
• High tensile strength of 70,000 psi ensures reliable fastening under significant mechanical stress.
• Rockwell B55 hardness provides excellent durability and resistance to wear during installation and use.
• Fully threaded design offers consistent grip and holding power along the entire 3/8" length.
• Coarse UNC thread with Class 2A fit allows for quick assembly and secure fastening in various materials.
• Slotted fillister head enables easy installation with standard screwdrivers and a low-profile, rounded design.
• Compliance with ASME B18.6.3 ensures consistent quality and interchangeability in industrial applications.

Professional Applications & Engineering Value

This 4-40 UNC slotted fillister head screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and assembly efficiency. The 18-8 Stainless Steel material, combined with a passivated finish, provides exceptional resistance to rust and chemical exposure, making it ideal for use in machinery, electronics, and outdoor equipment. The coarse thread and Class 2A fit ensure quick, reliable fastening in metals and plastics, reducing installation time while maintaining secure connections. Its fully threaded design and high rounded head profile offer enhanced clamping force and a sleek appearance, suitable for precision assemblies where space and aesthetics are critical.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 2A dimensional accuracy for consistent fit and performance. It is manufactured in compliance with ASME B18.6.3 standards and is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory adherence for global industrial use.