S-94559A622 5/16"-18 x 1 1/2" Aluminum Oversized-Flange Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance and lightweight strength from 6061 Aluminum, ideal for applications where weight reduction and durability are critical
• Enhanced load distribution and secure fastening with the integrated flange, preventing surface damage and reducing the need for separate washers
• High tensile strength of 40,000 psi ensures reliable performance under significant mechanical stress in demanding industrial environments
• Easy and efficient installation with the hex drive (3/16") and rounded button head, allowing for quick assembly with standard tools
• Wide compatibility and reliable thread engagement due to the 5/16"-18 UNC coarse thread and Class 2A fit, suitable for a variety of materials
• Full threading along the 1-1/2" length provides maximum grip and adjustability in deep or variable thickness applications
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and meets international standards for industrial components

Professional Applications & Engineering Value

This 5/16"-18 UNC Rounded Head Flanged Screw in 6061 Aluminum is engineered to address common industrial challenges such as vibration loosening, weight constraints, and corrosion. The flanged design distributes clamping force evenly, reducing the risk of material fatigue and eliminating the need for additional washers, which streamlines assembly. Its coarse UNC threading and Class 2A thread fit ensure quick, secure fastening in softer materials or where rapid installation is essential, such as in machinery, automotive frames, and electronic enclosures. The hex drive and rounded button head offer a low-profile, tamper-resistant solution that withstands high-torque applications without stripping. Made from 6061 Aluminum, it provides an optimal balance of strength and lightweight properties, making it ideal for aerospace, marine, and structural assemblies where RoHS 3 and REACH compliance is mandatory for environmental and safety standards.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and UNC coarse threading (5/16"-18) per industry norms. It is manufactured from 6061 Aluminum with a tensile strength of 40,000 psi and Rockwell B40 hardness, ensuring reliable performance. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(b)-II for lead in aluminum alloys and REACH (EC 1907/2006) regulations, confirming its suitability for global industrial and commercial use without environmental concerns.