S-90128A054 2-56 x 5/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications.
• Superior corrosion resistance with zinc-plated alloy steel construction for extended service life in harsh environments.
• Precise Class 3A thread fit guarantees secure fastening and vibration resistance in critical assemblies.
• High hardness rating of Rockwell C37 provides excellent wear resistance and durability under repeated use.
• Standard hex drive compatibility allows for easy installation with common tools while preventing cam-out.
• Coarse UNC threading enables quick assembly and disassembly in various materials.
• Full compliance with industry standards including ASTM A574, RoHS 3, and REACH for quality assurance.

Professional Applications & Engineering Value

These zinc-plated alloy steel socket head cap screws deliver outstanding engineering value in demanding applications where failure is not an option. The combination of 170,000 psi tensile strength and Rockwell C37 hardness makes them ideal for machinery, automotive, and aerospace components subjected to extreme loads and vibrations. The 2-56 UNC coarse thread configuration provides excellent grip in various materials while the zinc plating offers superior protection against corrosion in industrial environments. The Class 3A thread fit ensures precise engagement and eliminates loosening concerns in precision equipment. These socket head fasteners are engineered to solve common industrial challenges including vibration-induced failures, corrosion degradation, and assembly efficiency requirements.

Specification Summary & Compliance

This socket head cap screw features a 2-56 UNC thread with Class 3A fit for precision threading applications. Manufactured to ASTM A574 specifications with inch system measurement, the fastener ensures dimensional accuracy and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety standards for industrial use. The right-hand thread direction and coarse thread spacing provide optimal performance in standard industrial applications requiring reliable fastening solutions.