S-91251A958 1 1/2"-6 x 5" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme loads, reducing the risk of fastener failure in critical applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
• High hardness rating (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use and high-torque installations.
• Coarse UNRC thread with Class 2A fit allows for faster assembly and reduced cross-threading risks, improving installation efficiency.
• Partially threaded design offers optimal grip and clamping force where needed, enhancing joint stability in structural applications.
• Standard hex socket drive enables high torque application with common tools, ensuring secure fastening in confined spaces.
• Full compliance with ASTM A574 guarantees consistent quality and dimensional accuracy, meeting rigorous industrial standards.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these black-oxide alloy steel socket head cap screws deliver exceptional performance where standard fasteners fail. The combination of 170,000 psi tensile strength and Rockwell C37 hardness makes them ideal for heavy machinery, construction equipment, and automotive assemblies subjected to vibration and shock loads. The coarse UNRC threads provide superior engagement in soft materials and prevent loosening under dynamic stress, while the partially threaded shank concentrates clamping force precisely where needed. These socket head cap screws solve critical engineering challenges by offering reliable fastening solutions that withstand extreme conditions while maintaining dimensional stability throughout their service life.

Specification Summary & Compliance

This 1 1/2"-6 socket head cap screw features Class 2A thread fit tolerance for consistent assembly performance and UNRC coarse thread spacing per industry standards. Manufactured to ASTM A574 specifications for high-strength alloy steel fasteners, it ensures dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting international environmental and safety standards for industrial applications.