S-94559A162 4-40 x 1/2" 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
• Enhanced durability with 40,000 psi tensile strength and Rockwell B40 hardness for reliable performance
• Quick and secure installation via hex drive design, preventing cam-out and reducing assembly time
• Stable fastening with integrated flange that distributes load evenly, minimizing surface damage
• Wide compatibility with Class 2A coarse UNC threads, ensuring easy engagement in various materials
• Full threading for maximum grip along the entire 1/2" length, providing consistent holding power
• Compliance with global standards including RoHS 3 and REACH, meeting strict environmental and safety regulations

Professional Applications & Engineering Value

This 4-40 UNC aluminum rounded head screw is engineered to address common industrial challenges such as vibration loosening and material incompatibility. The 6061 aluminum offers excellent strength-to-weight ratio, reducing overall system weight while resisting corrosion in applications like electronics enclosures, machinery panels, and automotive assemblies. The flanged hex drive design eliminates the need for separate washers, speeding up installation in tight spaces and providing a broader bearing surface to prevent pull-through. With coarse threads and Class 2A fit, it ensures reliable fastening in softer materials or where frequent disassembly is required, making it a versatile choice for maintenance-heavy environments.

Specification Summary & Compliance

This screw adheres to UNC thread standards with a Class 2A tolerance for consistent fit and performance. It features a 1/2" length, fully threaded design, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances as per exemption guidelines for aluminum machining alloys.