S-90939A111 4-40 x 3/16" Stainless Steel Button Head Torx Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – Withstands up to 130,000 psi for reliable performance in demanding applications.
• Superior Corrosion & High-Temperature Resistance – A286 Stainless Steel construction ensures durability in harsh environments.
• Secure Torx T10 Drive – Reduces cam-out and provides precise torque application for consistent fastening.
• Fully Threaded Design – Maximizes holding power and load distribution along the entire 3/16" length.
• Precision Class 2A Thread Fit – Ensures smooth assembly and reliable engagement with UNC coarse threads.
• Compact Rounded Button Head – Offers a low-profile, flush finish while maintaining easy access for driving.
• Compliant with RoHS 3 & REACH – Meets strict environmental and safety standards for industrial use.

Professional Applications & Engineering Value

Engineered for high-performance industrial applications, these 4-40 UNC A286 Stainless Steel Torx button head screws address critical challenges in aerospace, automotive, and electronics assembly. The A286 material grade provides excellent resistance to oxidation and creep at elevated temperatures, preventing fastener failure in thermally demanding environments. The fully threaded coarse UNC design ensures rapid installation and robust vibration resistance, while the Torx T10 drive minimizes tool slippage and damage during high-torque operations. Ideal for securing components where space is limited and reliability is non-negotiable, these screws deliver consistent corrosion protection and long-term mechanical integrity.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 2A tolerance for precise fit and easy assembly. Manufactured from A286 Stainless Steel with a hardness of Rockwell C24, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental safety and regulatory adherence for global industrial use.