S-92949A320 2-56 x 7/16" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh environments
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term fastening
• Precise thread engagement with Class 3A fit and UNC coarse threads, ensuring secure installation and vibration resistance
• Easy installation and removal using standard 0.050" hex drive tools, reducing assembly time and tooling costs
• Full threading along the 7/16" length provides maximum grip and load distribution across the entire fastener
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring regulatory acceptance and material safety
• Rounded button head design offers a low-profile, finished appearance while minimizing snagging risks

Professional Applications & Engineering Value

These 2-56 UNC rounded head screws are engineered to address critical industrial fastening challenges where corrosion resistance, high tensile strength, and precise thread fit are paramount. The 18-8 stainless steel material, enhanced by a passivated finish, provides excellent protection against oxidation and chemical exposure, making them suitable for electronics enclosures, machinery, and outdoor equipment. The Class 3A thread fit and coarse UNC threading ensure tight tolerances and reliable performance in high-vibration applications, reducing the risk of loosening over time. With a hex drive design, installation is streamlined using common tools, improving assembly efficiency in automated or manual production lines. These screws deliver consistent engineering value in sectors requiring durable, compliant, and easy-to-install industrial fasteners.

Specification Summary & Compliance

This screw meets precise dimensional standards with Class 3A thread fit per UNC specifications, ensuring high accuracy and interchangeability. Manufacturing and material quality adhere to ASME B18.3, while environmental and safety compliance is confirmed with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. The product is fully threaded, with a length of 7/16", and is designed for right-hand threading applications, supporting reliable performance in regulated industrial settings.