S-91306A439 1/2"-13 x 2" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc plating extends service life, ideal for harsh industrial environments.
• Precise Class 3A thread fit provides excellent engagement and vibration resistance, minimizing loosening over time.
• Robust Rockwell C39 hardness offers high durability and wear resistance, maintaining integrity under heavy loads.
• Convenient 5/16" hex drive allows for easy installation and removal with standard tools, saving time on assembly lines.
• Fully threaded UNC coarse spacing enables faster driving and stronger holding power in a variety of materials.
• Compliance with major standards including ASME B18.3 and ASTM F835 ensures consistent quality and interoperability.

Professional Applications & Engineering Value

This zinc-plated alloy steel rounded head screw is engineered to address critical challenges in heavy-duty industrial settings. Its high tensile strength (120,000 psi) and Rockwell C39 hardness make it suitable for applications subject to significant stress and vibration, such as machinery assembly, structural frameworks, and automotive components. The UNC coarse thread with Class 3A fit ensures secure fastening in metals and other tough materials, reducing the need for frequent maintenance. The zinc plating provides a protective barrier against corrosion, extending the fastener's lifespan in outdoor or humid conditions. With a rounded button head and hex drive, it offers a low-profile, aesthetically pleasing finish while allowing for efficient torque application, making it a reliable choice for engineers and procurement specialists seeking durable, high-performance industrial screws.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC thread with coarse spacing and Class 3A thread fit for precise dimensional accuracy. It is fully threaded and right-hand oriented, with a length of 2 inches, head diameter of 0.875 inches, and drive size of 5/16 inches. Manufactured in compliance with ASME B18.3 and ASTM F835 specifications, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and regulatory adherence for global industrial use.