S-90044A425 1/4"-20 x 2 3/8" ASME B18.3, ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Exceptional hardness rating (Rockwell C37) provides excellent wear resistance and durability for extended service life.
• Precision Class 3A thread fit guarantees secure, vibration-resistant assemblies with minimal play.
• Black-oxide surface treatment on alloy steel offers enhanced corrosion resistance without compromising dimensional integrity.
• Partially threaded design allows for precise clamping force control and easier alignment in assembled components.
• Compliance with ASME B18.3 and ASTM A574 ensures consistent quality and interchangeability in industrial settings.
• Hex socket drive enables high-torque installation and removal in confined spaces, improving maintenance efficiency.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty machinery, automotive, and precision equipment assembly. The coarse UNRC thread and Class 3A fit provide superior resistance to loosening under dynamic loads, while the partially threaded shank concentrates clamping force exactly where needed. With a 170,000 psi tensile strength and Rockwell C37 hardness, it withstands extreme operational stresses that cause standard fasteners to fail. The black-oxide finish adds a protective layer against rust and corrosion in harsh environments, making it ideal for outdoor or high-moisture applications. These features collectively reduce maintenance frequency, enhance structural integrity, and ensure long-term reliability in demanding industrial screw applications.

Specification Summary & Compliance

This socket head cap screw features a 1/4"-20 UNRC coarse thread with Class 3A precision tolerance for consistent threading performance. It is manufactured in accordance with ASME B18.3 dimensional standards and ASTM A574 material specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets international environmental and safety requirements for industrial use.