S-91251A590 3/8"-16 x 1 3/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi provides superior resistance to mechanical stress and prevents failure in high-load applications
• Precision Class 3A thread fit ensures smooth installation and reliable engagement with mating components, reducing assembly time and improving joint integrity
• Black-oxide surface treatment on alloy steel offers enhanced corrosion resistance and minimal galling during tightening in demanding environments
• Rockwell C37 hardness rating delivers excellent wear resistance and maintains fastener integrity under repeated use and vibration
• Fully threaded design with UNRC coarse threads allows for maximum grip length and faster installation across various material thicknesses
• Hex socket drive (5/16") enables high-torque application with standard tools, minimizing cam-out and ensuring secure fastening in confined spaces
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and meets international standards for industrial components

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this socket head cap screw addresses critical challenges in machinery assembly, automotive systems, and construction equipment. The black-oxide alloy steel construction combats corrosion while the Class 3A thread fit eliminates play and vibration-induced loosening. With its fully threaded UNRC coarse thread profile, it provides superior clamping force in thick materials and soft substrates, reducing the need for precise hole threading. The hex drive socket head design allows for high torque transmission without stripping, making it ideal for maintenance operations and OEM production lines where reliability and 170,000 psi tensile strength are non-negotiable.

Specification Summary & Compliance

This fastener maintains Class 3A thread tolerances per UNRC standards with coarse 3/8"-16 thread sizing. Manufacturing adheres to ASTM A574 specifications for socket head cap screws, ensuring dimensional consistency and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for global industrial supply chains and environmentally conscious operations.