S-90939A114 4-40 x 1/2" Stainless Steel Button Head Torx Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with 130,000 psi tensile strength and Rockwell C24 hardness for reliable performance in demanding applications.
• Superior corrosion resistance provided by A286 stainless steel material, ensuring longevity in harsh industrial environments.
• Secure and efficient installation with the Torx T10 drive, offering better torque transfer and reduced risk of cam-out compared to standard drives.
• Precise and reliable thread engagement due to the Class 2A thread fit and fully threaded UNC coarse thread design, ensuring consistent fastening.
• Versatile and space-saving design with a rounded button head profile, ideal for applications where a low-profile, flush finish is required.
• Compliance with major environmental regulations including RoHS 3 and REACH, making them suitable for global supply chains and sensitive applications.
• Broad industrial compatibility with right-hand thread direction and 1/2" length, fitting standard UNC 4-40 requirements for various assemblies.

Professional Applications & Engineering Value

These 4-40 UNC A286 stainless steel Torx button head screws are engineered to address critical challenges in industrial fastening, such as vibration resistance and material fatigue. The A286 stainless steel composition offers excellent high-temperature strength and oxidation resistance, making these screws ideal for aerospace, automotive, and heavy machinery applications where reliability is paramount. The Torx drive style (T10) minimizes tool slippage, enhancing installation efficiency and reducing assembly errors. With a coarse thread and fully threaded design, they provide superior holding power in softer materials or where rapid installation is needed. The rounded head profile ensures a smooth, low-profile finish, preventing snagging and improving safety in compact spaces. By combining high tensile strength and regulatory compliance, these screws deliver long-term value in precision engineering projects.

Specification Summary & Compliance

This product adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy and ease of assembly. Key specifications include a 4-40 thread size, 1/2" length, and T10 Torx drive. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for industrial use without hazardous substances.