S-90044A428 5/16"-18 x 11/16" 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.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life and maintains integrity in harsh industrial environments.
• Precise Class 3A thread fit provides tight, secure connections with minimal play, enhancing assembly accuracy and vibration resistance.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity and drive features through repeated use.
• Standard hex socket drive with 1/4" size allows for easy installation and high torque application using common tools, improving efficiency.
• Fully threaded design ensures consistent clamping force along the entire length, ideal for applications requiring uniform pressure distribution.
• Compliance with major standards including ASME B18.3 and ASTM A574 guarantees consistent quality and interoperability with other components.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw delivers critical engineering solutions where high strength and durability are paramount. The combination of 170,000 psi tensile strength and Rockwell C37 hardness makes it ideal for heavy machinery, automotive assemblies, and precision equipment that experience dynamic loads and vibrations. The UNRC coarse thread with Class 3A fit ensures quick assembly and reliable fastening in materials where fine threads might strip, while the black-oxide surface treatment provides essential corrosion protection in humid or chemically aggressive environments. Fully threaded for maximum adjustability and grip, this socket head cap screw meets the rigorous demands of industrial maintenance, manufacturing, and construction applications where failure is not an option.

Specification Summary & Compliance

This socket head cap screw features precise inch system measurements with 5/16"-18 UNRC coarse threads and Class 3A thread fit for superior dimensional accuracy. It is manufactured in compliance with ASME B18.3 specifications and ASTM A574 material standards, ensuring consistent performance. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety regulations for hazardous substances.