S-90128A741 1/2"-13 x 6" 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 applications, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc plating extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides secure, vibration-resistant connections for improved assembly integrity.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
• Coarse UNC threads enable faster installation and reduced cross-threading risks in demanding conditions.
• Partially threaded design allows for controlled clamping force and precise positioning in assemblies.
• 3/8" hex drive compatibility ensures easy installation with standard tools, speeding up assembly processes.

Professional Applications & Engineering Value

This zinc-plated alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty industrial settings. The 1/2"-13 UNC coarse thread configuration provides superior grip and load distribution in materials prone to vibration loosening, while the Class 3A thread fit ensures precise engagement for consistent clamping force. The socket head design with 3/8" hex drive allows for high-torque installation in confined spaces, making it ideal for machinery, automotive, and construction applications where access is limited. The zinc plating delivers essential corrosion protection in environments exposed to moisture and chemicals, significantly extending service life and reducing replacement frequency. With a minimum thread length of 1-1/2", this fastener maintains secure connections even in dynamic loading conditions, providing engineers with a reliable solution for critical assemblies.

Specification Summary & Compliance

This socket head cap screw features 1/2"-13 UNC coarse threads with Class 3A thread fit for precision engagement, manufactured to ASTM A574 specifications for consistent quality. The 6" length with partial threading provides versatile fastening options. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures environmental responsibility and safe use in regulated industries.