S-94559A154 4-40 x 1/4" Aluminum Oversized-Flange Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 6061 aluminum construction, ideal for harsh industrial environments
• High tensile strength of 40,000 PSI ensures reliable performance under mechanical stress
• Rockwell B40 hardness provides excellent durability and resistance to wear
• Flanged button head design distributes load evenly and prevents surface damage during installation
• 1/16" hex drive allows for secure, slip-resistant tightening with standard tools
• Class 2A thread fit guarantees precise, easy assembly and interchangeability
• Fully threaded UNC coarse pattern enables faster installation and stronger holding power

Professional Applications & Engineering Value

This 4-40 UNC coarse thread screw is engineered from 6061 aluminum to address common challenges in industrial assembly, such as weight reduction without sacrificing strength. The flanged rounded button head eliminates the need for separate washers, reducing part count and assembly time, while the hex drive ensures torque integrity in high-vibration applications. With a fully threaded design and Class 2A fit, it provides consistent clamping force in machinery, electronics, and automotive components, making it a versatile solution for precision fastening where lightweight durability is critical.

Specification Summary & Compliance

This screw adheres to UNC thread standards with Class 2A thread fit for precise dimensional accuracy. It is manufactured to meet RoHS 3 (2015/863/EU) compliance under exemption 6(b)-II for lead in aluminum alloys and REACH (EC 1907/2006) standards, ensuring environmental and safety regulations are upheld for industrial use.