S-94414A110 4-40 x 1/2" ASME B18.3, ASTM F835 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior torque transmission and reduced cam-out with Torx Plus IP10 drive for reliable fastening in high-stress applications
• Enhanced corrosion resistance and durability provided by the black-oxide finish on alloy steel, extending service life in demanding environments
• Exceptional mechanical strength with 140,000 psi tensile strength and Rockwell C39 hardness to withstand heavy loads and prevent stripping
• Precise and secure thread engagement due to Class 3A thread fit and UNC coarse threading, ensuring vibration resistance and consistent performance
• Flush mounting and streamlined appearance with the standard 82° flat head profile, ideal for applications where a smooth surface is critical
• Full threading along the 1/2" length for maximum grip and adjustability across the entire fastener
• Compliance with major industrial standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and regulatory adherence

Professional Applications & Engineering Value

These 4-40 UNC flat head screws are engineered to address common industrial challenges such as fastener failure under high vibration and corrosive conditions. The black-oxide alloy steel construction offers a robust barrier against rust and wear, while the Torx Plus drive system minimizes tool slippage, enhancing assembly efficiency and reducing downtime. With a coarse thread spacing and Class 3A thread fit, these screws provide quick installation and reliable holding power in materials like metal and hardened plastics. Ideal for industrial machinery, electronics enclosures, and automotive components, they deliver consistent performance where precision and durability are paramount. The fully threaded design ensures uniform stress distribution, making them a trusted choice for critical engineering applications.

Specification Summary & Compliance

This product adheres to ASME B18.3 specifications, ensuring dimensional accuracy and interchangeability. The UNC thread with Class 3A fit provides tight tolerances for secure fastening, while the 82° countersink angle aligns with standard flat head profiles. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting environmentally responsible manufacturing practices.