S-90044A436 1/2"-13 x 9 1/2" ASME B18.3, ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides secure, vibration-resistant connections, enhancing assembly integrity and safety.
• Coarse UNRC threads allow for quick and easy installation, saving time in production and maintenance workflows.
• Rockwell C37 hardness offers excellent wear resistance, maintaining dimensional stability under heavy loads.
• Partially threaded design enables optimal clamping force distribution, ideal for applications requiring precise joint control.
• Hex socket drive facilitates high-torque installation with standard tools, improving efficiency and reducing stripping risks.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, construction equipment, and automotive systems. The coarse UNRC threads and Class 3A fit ensure rapid, secure fastening even in high-vibration environments, reducing loosening and maintenance downtime. The black-oxide surface treatment provides enhanced corrosion resistance, making it suitable for outdoor or chemically exposed applications where durability is paramount. With a tensile strength of 170,000 psi and Rockwell C37 hardness, it withstands extreme mechanical stresses, offering long-term reliability for demanding engineering projects that require consistent performance and safety compliance.

Specification Summary & Compliance

This socket head cap screw adheres to ASME B18.3 specifications with a Class 3A thread fit for precise dimensional accuracy. It features a 1/2"-13 UNRC coarse thread and is manufactured from alloy steel per ASTM A574. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for global industrial use.