S-90201A553 5/8"-11 x 6" Extreme-Strength Grade 9 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 180,000 PSI ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from Zinc Yellow-Chromate plating extends service life in harsh environments, minimizing maintenance and replacement costs.
• High hardness rating (Rockwell C38) provides excellent wear resistance and durability, maintaining thread integrity under repeated use.
• Class 2A thread fit with UNC coarse threading offers easy installation and secure fastening, saving time during assembly while preventing cross-threading.
• Partially threaded design allows for precise clamping force distribution, ideal for applications requiring controlled grip range.
• External hex drive and standard hex head enable quick tightening with common tools, improving efficiency in maintenance and construction tasks.
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and meets global sourcing requirements for industrial projects.

Professional Applications & Engineering Value

Engineered for heavy-duty applications, this Grade 9 hex head screw delivers robust performance in construction, machinery assembly, and structural frameworks where high tensile strength is critical. The steel material combined with a Zinc Yellow-Chromate finish effectively combats corrosion, addressing common issues in outdoor or chemically exposed settings. Its 5/8"-11 UNC coarse thread and Class 2A fit provide reliable engagement in coarse-grained materials, reducing installation time while ensuring vibration resistance. The partially threaded configuration allows for optimal load distribution, making it suitable for bolted joints that require unthreaded shank sections to bear shear loads, thereby enhancing overall fastener reliability in demanding industrial environments.

Specification Summary & Compliance

This hex head screw adheres to inch system measurements with precise dimensions: 6" length, 5/8"-11 UNC coarse thread, and Class 2A thread fit for consistent accuracy. It meets Grade 9 strength classification with a tensile strength of 180,000 PSI and Rockwell C38 hardness. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental and safety regulations are fully satisfied for industrial use.