S-91251A740 1/2"-13 x 8" 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 industrial applications, reducing the risk of fastener failure.
• Black-oxide finish on alloy steel provides enhanced corrosion resistance, extending service life in demanding environments.
• Class 3A thread fit with UNRC coarse threads offers superior precision and ease of assembly, minimizing cross-threading and improving installation efficiency.
• Partially threaded design and 3/8" hex drive allow for secure clamping in specific zones and straightforward installation with standard tools.
• Rockwell C37 hardness delivers excellent wear resistance, maintaining integrity under repeated loads and vibrations.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees adherence to rigorous quality and environmental standards, ensuring safety and regulatory acceptance.
• 8-inch length with 1-1/2" minimum thread engagement provides versatility for thick assemblies and robust connections in heavy-duty machinery.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in industrial settings, such as vibration loosening and corrosion-induced degradation. The alloy steel construction combined with a black-oxide surface treatment resists rust and wear, making it ideal for applications in automotive, construction, and machinery where exposure to harsh conditions is common. Its UNRC coarse threads and Class 3A fit ensure precise alignment and strong holding power, reducing assembly errors and maintenance downtime. By incorporating a partially threaded rod and hex drive, it facilitates easy installation in confined spaces, enhancing productivity in heavy-duty industrial use while meeting stringent ASTM A574 specifications for reliability.

Specification Summary & Compliance

This socket head cap screw features a 1/2"-13 thread size with Class 3A thread fit and UNRC coarse threads, ensuring high precision and dimensional accuracy per inch system standards. It meets ASTM A574 for material and manufacturing consistency, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety requirements without hazardous substances.