S-91251A966 5/8"-11 x 13" 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.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in critical machinery and equipment.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability, extending service life in harsh industrial environments.
• Coarse UNC threads enable faster installation and easier alignment, saving time and labor costs in assembly and maintenance operations.
• Partially threaded design allows for precise clamping force control, ideal for applications requiring specific grip lengths without thread interference.
• Rockwell C37 hardness ensures high wear resistance and maintains structural integrity under repetitive loads and extreme conditions.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees adherence to international quality and environmental standards, ensuring safety and regulatory acceptance.

Professional Applications & Engineering Value

This 5/8"-11 UNC Socket Head Cap Screw is engineered to address common industrial challenges such as vibration loosening, corrosion, and high tensile demands. The black-oxide alloy steel construction provides a robust barrier against moisture and chemicals, making it suitable for heavy machinery, automotive assemblies, and construction equipment. Its coarse thread design facilitates quick installation in coarse-grained materials, while the Class 3A thread fit ensures minimal backlash and secure fastening in precision engineering applications. With a partially threaded rod profile, it offers flexibility in joint design, preventing over-tightening and distributing stress evenly. Ideal for use in industrial socket screw setups, this fastener delivers long-term reliability, reducing maintenance downtime and enhancing operational efficiency in sectors like manufacturing, aerospace, and infrastructure.

Specification Summary & Compliance

This product features precise Class 3A thread fit per UNC standards, with a thread size of 5/8"-11 and a minimum thread length of 1 3/4". It adheres to ASTM A574 specifications for high-strength socket head cap screws, ensuring consistent quality and performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms environmental safety and regulatory alignment for global industrial use.