S-91205A728 5/8"-11 x 1 1/2" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking 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 demanding applications.
• Nylon Patch thread locker provides vibration-resistant locking without disassembly issues, maintaining secure fastening from -70° to 250°F.
• Class 3A thread fit offers superior precision and tighter tolerances for improved assembly accuracy and reduced backlash in critical connections.
• Black-oxide coating on alloy steel enhances corrosion resistance and durability, extending service life in harsh industrial environments.
• 1/2" hex drive design allows for high-torque installation with standard tools, facilitating efficient assembly and maintenance operations.
• Coarse UNC threads enable quicker installation and better performance in materials prone to stripping or where rapid assembly is required.
• Full threading along the 1-1/2" length provides consistent grip and adjustability, ensuring uniform load distribution across the entire fastener.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in heavy-duty industrial settings, where vibration, high stress, and environmental factors compromise fastener integrity. The Class 3A UNC coarse threads deliver precise engagement, minimizing the risk of cross-threading and ensuring reliable connections in machinery, automotive assemblies, and structural frameworks. The Nylon Patch thread locker effectively counters loosening under dynamic loads, making it ideal for applications subject to constant motion or thermal cycling. Combined with a Rockwell C37 hardness and robust alloy steel construction, this screw provides long-term durability in demanding environments such as manufacturing equipment, construction projects, and aerospace components, where failure is not an option.

Specification Summary & Compliance

This socket head cap screw features a 5/8"-11 UNC coarse thread with Class 3A fit for high precision, ensuring tight tolerances and reliable performance. It is manufactured in compliance with ASME B18.3 and ASTM A574 specifications, guaranteeing consistent quality and dimensional accuracy. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory standards, confirming its safety and environmental compliance for global industrial use.