S-91251A855 3/4"-10 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 high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance provided by the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
• Precise Class 3A thread fit guarantees tight, secure fastening with minimal play, enhancing assembly integrity and vibration resistance.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use and disassembly.
• 5/8" hex drive design allows for high-torque installation with standard tools, speeding up assembly while preventing stripping.
• Partially threaded shank provides optimal grip length control, ideal for applications requiring precise clamping force distribution.
• Full regulatory compliance with ASTM A574, RoHS 3, and REACH standards ensures material consistency and environmental safety for global supply chains.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this socket head cap screw delivers critical performance where standard fasteners fail. The black-oxide alloy steel construction combined with Class 3A UNRC coarse threads provides superior resistance to vibrational loosening in machinery, construction equipment, and automotive assemblies. Its 170,000 psi tensile strength and Rockwell C37 hardness make it ideal for high-stress joints requiring repeated maintenance access. The 5/8" hex drive accommodates high torque values without cam-out, while the partially threaded design concentrates clamping force precisely where needed. These features solve common engineering challenges like joint relaxation, corrosion-induced seizure, and installation efficiency in confined spaces.

Specification Summary & Compliance

This socket head cap screw maintains Class 3A thread fit per UNRC standards with 3/4"-10 coarse threading and minimum 2" thread length. Manufacturing conforms to ASTM A574 specifications for alloy steel socket head cap screws. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring hazardous substance restrictions are met for international industrial use.