S-90128A720 1/2"-13 x 2" 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 from zinc plating protects against rust and environmental degradation, extending service life in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances and better engagement, minimizing backlash and improving assembly accuracy.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated installations and removals.
• Hex socket drive design allows for high torque application and secure installation in confined spaces where wrench clearance is limited.
• Coarse UNC threading enables faster installation and reduced cross-threading risk compared to fine thread alternatives.
• Full threading along the 2" length provides maximum grip and adjustment flexibility throughout the entire fastener engagement area.

Professional Applications & Engineering Value

These zinc-plated alloy steel socket head cap screws deliver critical performance advantages for industrial applications where vibration resistance, corrosion protection, and high clamping forces are essential. The combination of 170,000 PSI tensile strength and Rockwell C37 hardness makes these UNC coarse thread fasteners ideal for heavy machinery, automotive assemblies, and structural frameworks where joint integrity cannot be compromised. The hex drive socket design accommodates high torque requirements while the Class 3A thread fit ensures precise alignment in critical bolted connections. The zinc plating provides sacrificial protection against galvanic corrosion, making these fully threaded screws suitable for outdoor equipment and marine applications where environmental exposure is a concern.

Specification Summary & Compliance

This socket head cap screw features precise 1/2"-13 UNC coarse threading with Class 3A fit for superior dimensional accuracy. Manufacturing complies with ASTM A574 specification for alloy steel socket head cap screws. The product meets RoHS 3 (2015/863/EU) compliance for restricted hazardous substances and REACH (EC 1907/2006) regulations for chemical safety. With a 2" length, 3/4" head diameter, and 3/8" hex drive, these industrial fasteners maintain consistent quality across production batches for reliable performance in critical applications.