S-91251A622 3/8"-16 x 3/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide coating, ideal for harsh industrial environments
• Superior tensile strength of 170,000 psi for reliable performance under high-stress conditions
• Precise Class 3A thread fit ensures tight, secure fastening with minimal backlash
• Robust Rockwell C37 hardness provides excellent wear and deformation resistance
• 5/16" hex drive design allows for high-torque installation with standard tools
• Fully threaded UNC coarse thread enables quick assembly and strong holding power
• Compliance with ASTM A574 guarantees consistent quality and material integrity

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw delivers exceptional engineering value in demanding applications where vibration resistance, corrosion protection, and high clamp load retention are critical. The UNC coarse thread combined with Class 3A precision ensures rapid installation and reliable performance in heavy machinery, automotive assemblies, and industrial equipment. The fully threaded design provides maximum engagement in tapped holes, while the socket head profile with 5/16" hex drive accommodates confined spaces and high-torque requirements. Engineered to withstand extreme conditions without compromising structural integrity, these screws solve common industrial challenges including fastener loosening, material fatigue, and environmental degradation.

Specification Summary & Compliance

This socket head cap screw features 3/8"-16 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. Manufactured to ASTM A574 specifications with Rockwell C37 hardness and 170,000 psi tensile strength. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.