S-90128A840 1/2"-20 x 1" 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.
• Superior corrosion resistance provided by zinc-plated alloy steel, extending service life in harsh industrial environments.
• Precise Class 3A fine thread fit offers excellent vibration resistance and secure fastening in critical assemblies.
• High hardness rating (Rockwell C37) enhances wear resistance and maintains thread integrity during repeated use.
• 3/8" hex drive design allows for easy installation and high torque application with standard tools.
• Fully threaded construction ensures consistent clamping force along the entire 1" length for uniform load distribution.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global applications.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this 1/2"-20 UNF socket head cap screw delivers exceptional performance where reliability is critical. The zinc-plated alloy steel construction provides superior corrosion protection, making it ideal for machinery, automotive, and heavy equipment subjected to moisture and chemicals. The Class 3A fine thread spacing ensures tight, vibration-resistant connections in precision assemblies, while the fully threaded design maximizes engagement in tapped holes or nuts. With a 170,000 PSI tensile strength and Rockwell C37 hardness, it withstands extreme loads and repetitive stress, reducing maintenance downtime and replacement costs. This fastener is particularly valuable in aerospace, manufacturing, and construction sectors where high-strength socket screws are essential for structural integrity and safety compliance.

Specification Summary & Compliance

This socket head cap screw features a 1/2"-20 UNF fine thread with Class 3A fit for precise tolerance, ensuring consistent thread engagement. It adheres to ASTM A574 manufacturing standards for high-strength alloy steel fasteners. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and international industrial applications.