S-91864A030 5-40 x 7/16" 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 in demanding applications.
• Superior corrosion resistance from the black-oxide finish prolongs service life in harsh industrial environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit provides tight, secure fastening with reduced risk of loosening, enhancing assembly integrity and safety.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated installations and removals.
• Hex socket drive design allows for high torque application and easy installation in confined spaces, improving assembly efficiency.
• Fully threaded coarse UNC design ensures quick engagement and strong holding power across the entire length, speeding up installation times.
• Compliance with major standards including ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global supply chain integration.

Professional Applications & Engineering Value

Engineered for high-performance industrial applications, this black-oxide alloy steel socket head cap screw addresses critical engineering challenges in machinery assembly, automotive components, and heavy equipment. The combination of 170,000 psi tensile strength and Rockwell C37 hardness ensures durability against dynamic loads and vibration, while the black-oxide surface treatment provides essential corrosion protection in humid or chemically aggressive environments. The 5-40 UNC coarse thread with Class 3A fit delivers precise, reliable fastening in metal-to-metal applications, reducing assembly time and improving joint integrity. Ideal for high-torque hex drive installations, these screws maintain dimensional stability and performance consistency across demanding operational cycles.

Specification Summary & Compliance

This socket head cap screw features precision 5-40 UNC coarse threads with Class 3A thread fit for exacting dimensional accuracy. Manufactured in compliance with ASTM A574 specification for alloy steel socket head cap screws, it ensures consistent mechanical properties and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting international environmental and safety standards for industrial fastener applications.