S-90044A166 1/2"-13 x 3" 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 the black-oxide finish extends service life in demanding industrial environments
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections in critical assemblies
• High hardness rating (Rockwell C37) maintains thread integrity and prevents stripping during repeated installation
• Hex socket drive design allows for high-torque installation in confined spaces with standard 3/8" tools
• Full threading along the 3" length offers maximum adjustment flexibility and clamping force distribution
• Regulatory compliance with RoHS 3 and REACH ensures environmental responsibility and global market acceptance

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw delivers critical performance advantages for heavy-duty industrial applications where reliability is non-negotiable. The combination of 170,000 psi tensile strength and Rockwell C37 hardness provides exceptional resistance to dynamic loads and fatigue, making it ideal for machinery, automotive, and construction equipment subjected to continuous stress. The UNRC coarse thread configuration ensures rapid installation and superior holding power in both metallic and composite materials, while the black-oxide surface treatment creates a protective barrier against corrosion without compromising dimensional accuracy. Engineered to ASTM A574 specifications, these fully threaded cap screws maintain consistent performance in temperature-variable environments where thermal expansion could compromise joint integrity.

Specification Summary & Compliance

This 1/2"-13 x 3" socket head cap screw features Class 3A thread fit with UNRC coarse threads (13 TPI) and right-hand thread direction. Manufacturing complies with ASTM A574 specifications for high-strength alloy steel fasteners. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) requirements for chemical safety, ensuring environmental responsibility and global regulatory acceptance.