S-91251A707 1/2"-13 x 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI ensures reliable performance under extreme loads, reducing the risk of fastener failure in critical applications.
• Superior corrosion resistance from the black-oxide finish extends service life in harsh environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit provides excellent engagement and vibration resistance, enhancing assembly integrity and safety.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use and high-stress conditions.
• Coarse UNC threads enable faster installation and are less prone to clogging in dirty or debris-filled industrial settings.
• 3/8" hex drive design allows for high torque application with standard tools, ensuring secure fastening and ease of maintenance.
• Full compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting global industry standards.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address common industrial challenges such as vibration loosening, corrosion, and high-stress fatigue. The 1/2"-13 UNC coarse thread with Class 3A fit ensures tight, reliable fastening in heavy machinery, automotive assemblies, and structural applications where precision and durability are paramount. The alloy steel construction combined with the protective black-oxide surface treatment provides outstanding resistance to rust and wear, making it ideal for outdoor, marine, or chemically exposed environments. Its fully threaded design and 3/8" hex drive facilitate quick installation and removal, reducing downtime in maintenance and production cycles while delivering consistent performance under demanding operational conditions.

Specification Summary & Compliance

This socket head cap screw features a 1/2"-13 UNC coarse thread with Class 3A precision fit, ensuring tight tolerances and reliable thread engagement. It is manufactured in accordance with ASTM A574 specifications, guaranteeing material consistency and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for use in various industrial and international markets.