S-90044A531 3/8"-16 x 3 1/4" 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 under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Precision Class 3A thread fit guarantees superior engagement and vibration resistance, minimizing loosening and maintaining assembly integrity.
• Black-oxide surface treatment on alloy steel provides enhanced corrosion resistance, extending service life in harsh industrial environments.
• High Rockwell C37 hardness offers excellent wear resistance, preserving thread form and drive integrity through repeated use.
• Fully threaded design allows for consistent clamping force along the entire length, ideal for adjustable or deep-set applications.
• 5/16" hex drive socket head enables high-torque installation with standard tools, facilitating efficient assembly and disassembly.
• Compliance with ASME B18.3 and ASTM A574 ensures dimensional accuracy and material consistency, meeting rigorous industry standards for reliability.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in heavy-duty machinery, automotive assemblies, and precision equipment. The 3/8"-16 coarse thread with Class 3A fit provides secure fastening in high-vibration environments, preventing joint failure and reducing maintenance needs. The alloy steel construction combined with black-oxide coating resists rust and wear, making it suitable for outdoor or corrosive settings. Its fully threaded body ensures uniform load distribution, while the socket head design allows for compact installations in confined spaces. Ideal for industrial fasteners requiring high tensile strength and durability, this screw delivers long-term performance in applications from manufacturing fixtures to structural frameworks.

Specification Summary & Compliance

This socket head cap screw adheres to ASME B18.3 dimensional standards and ASTM A574 material specifications, ensuring precise Class 3A thread fit for consistent performance. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting environmentally safe and regulated industrial use. The inch-based measurements, including 3/8"-16 coarse thread and 3 1/4" length, provide reliable interoperability with standard components.