S-90909A614 4-40 x 3/8" ASME B18.3 Stainless Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction
• High-strength performance with a 70,000 psi tensile strength for reliable, durable fastening in demanding applications
• Effortless installation and removal with a hex drive design that provides a secure grip for tools
• Enhanced load distribution and stability from the integrated flange and wide, rounded button head profile
• Precise and reliable thread engagement ensured by the Class 3A fit and coarse UNC thread for quick assembly
• Maximum grip and holding power along the entire shank due to the fully threaded design
• Guaranteed quality and safety with compliance to ASME B18.3, RoHS, and REACH standards

Professional Applications & Engineering Value

This 4-40 UNC thread screw is engineered from 316 stainless steel, offering exceptional resistance to chemicals, saltwater, and other corrosive elements, making it ideal for marine, chemical processing, and food industry applications. The combination of a flanged, rounded button head and a hex drive ensures a low-profile, secure fit that resists cam-out and distributes clamping force effectively, preventing surface damage. The coarse thread and Class 3A fit provide superior thread engagement and vibration resistance in materials where fine threads might strip, enhancing assembly speed and long-term reliability in machinery, electronics, and structural assemblies.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with a Class 3A fit for high precision. It is manufactured in accordance with the ASME B18.3 standard and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global industrial use.