S-91247A804 5/8"-11 x 2 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 PSI ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in critical applications.
• Zinc plating provides superior corrosion resistance, extending service life and maintaining integrity in harsh or outdoor environments.
• Grade 5 steel construction with Rockwell C25 hardness offers excellent durability and wear resistance, ideal for repetitive or heavy-duty use.
• Coarse UNC thread with Class 2A fit allows for faster installation and easier alignment, saving time and labor in assembly processes.
• External hex drive and hex head design enable secure tightening with standard tools, preventing stripping and ensuring consistent torque application.
• Partially threaded shank provides enhanced grip and clamping force where needed, improving joint stability in structural applications.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability, meeting industry specifications for safety and performance.

Professional Applications & Engineering Value

Engineered for demanding industrial and construction applications, this Grade 5 hex head screw addresses common challenges like vibration loosening and material fatigue. The zinc plated steel finish combats rust in exposed settings, while the coarse UNC thread and Class 2A thread fit ensure quick, secure fastening even in misaligned or dirty holes. Its partially threaded design concentrates clamping force effectively, making it ideal for machinery, structural frames, and heavy equipment where high tensile strength and durability are paramount. By integrating external hex drive compatibility, it simplifies maintenance and reduces tooling complexity, delivering long-term reliability in right-hand thread assemblies.

Specification Summary & Compliance

This screw features a 5/8"-11 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy, adhering to ASME B18.2.1 and SAE J429 manufacturing standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global supply chain integration.