S-90117A638 3/8"-16 x 3 1/2" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from the Black-Oxide finish on Alloy Steel, extending service life and maintaining integrity in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening in machinery and equipment.
• Hex socket drive design allows for high torque application and easy installation in confined spaces, improving assembly efficiency and reducing labor time.
• Coarse UNC threading enables quick engagement and disassembly, ideal for maintenance and repetitive use without compromising holding power.
• Compliance with ASME B18.3 standards guarantees consistent quality and interchangeability, ensuring compatibility with existing industrial systems.
• RoHS 3 and REACH compliance meets environmental regulations, making it suitable for global supply chains and eco-conscious manufacturing processes.

Professional Applications & Engineering Value

This Socket Head Cap Screw is engineered to address critical challenges in heavy-duty industrial settings, where vibration, high loads, and corrosive conditions are common. The Black-Oxide Alloy Steel construction combines high tensile strength and Rockwell C37 hardness to resist wear and deformation, while the UNC coarse thread and Class 3A fit ensure secure fastening in dynamic applications like machinery assembly, automotive systems, and construction equipment. Its partially threaded design provides optimal grip and alignment, reducing stress concentration points. By meeting ASME B18.3 specifications, it delivers reliable performance in precision engineering projects, minimizing downtime and maintenance costs for B2B clients.

Specification Summary & Compliance

This screw features a 3/8"-16 UNC thread with Class 3A precision fit, ensuring tight tolerances for secure assembly. It adheres to ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally regulated industries. Dimensions include a 3 1/2" length and 5/16" hex drive, designed for consistent performance in inch-based systems.