S-94559A151 4-40 x 3/16" Aluminum Oversized-Flange Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Enhanced Durability with 6061 Aluminum construction offering excellent corrosion resistance and a tensile strength of 40,000 psi for reliable performance in demanding environments.
• Superior Fastening Security due to the integrated flange design, which distributes load evenly and eliminates the need for separate washers, speeding up assembly.
• Efficient Installation and Removal with the 1/16" hex drive, providing a secure grip and reducing the risk of tool slippage or head stripping.
• Wide Rounded Button Head Profile delivers a low-profile, aesthetically pleasing finish while minimizing snagging risks in tight spaces.
• Reliable Thread Engagement with a fully threaded 4-40 UNC coarse thread and Class 2A fit, ensuring consistent clamping force and vibration resistance.
• Compliance with Global Standards, being RoHS 3 and REACH compliant, making it suitable for use in regulated industries and international markets.
• Lightweight yet Strong aluminum material with Rockwell B40 hardness, ideal for applications where weight reduction is critical without sacrificing mechanical integrity.

Professional Applications & Engineering Value

This 4-40 UNC Rounded Head Flanged Screw is engineered from 6061 Aluminum to address common industrial challenges such as component weight, corrosion, and assembly efficiency. The wide rounded button head and integrated flange provide a broad bearing surface, preventing surface damage and offering a secure, low-profile fastening solution that is perfect for electronic enclosures, machinery panels, and automotive assemblies. Its coarse UNC threading and Class 2A thread fit ensure quick, reliable installation even in materials prone to stripping, while the hex drive design allows for high-torque application with standard tools. This combination of lightweight aluminum and robust 40,000 psi tensile strength makes it an ideal choice for applications demanding both durability and weight savings, such as in aerospace, robotics, and precision instrumentation, where consistent performance and regulatory compliance are paramount.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent assembly and a UNC coarse thread with 4-40 size. Manufacturing complies with industry norms for 6061 Aluminum fasteners, ensuring reliability in thread diameter (0.112") and length (3/16"). 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 environmentally conscious and global industrial use.