S-90201A539 5/8"-11 x 3" Extreme-Strength Grade 9 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 180,000 PSI ensures reliable performance under extreme loads, reducing the risk of fastener failure in critical applications.
• Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments, minimizing maintenance and replacement costs.
• High hardness rating (Rockwell C38) provides excellent wear resistance and durability, maintaining thread integrity through repeated use.
• Coarse UNC threading offers faster installation and better performance in materials where fine threads might strip or fail.
• Partial threading design allows for precise clamping force distribution, ideal for applications requiring specific unthreaded shank sections.
• External hex drive with standard head dimensions enables easy installation with common tools while providing secure torque transfer.
• Full regulatory compliance with RoHS 3 and REACH standards ensures environmental responsibility and global market acceptance.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this Grade 9 hex head screw delivers exceptional performance where standard fasteners fail. The combination of 180,000 PSI tensile strength and Rockwell C38 hardness makes it ideal for heavy machinery, structural steel connections, and high-vibration environments. The zinc yellow-chromate plating provides superior corrosion protection in outdoor applications or chemically aggressive settings, while the 5/8"-11 UNC coarse thread ensures rapid installation and reliable grip in various materials. The partially threaded design allows for precise joint compression and prevents thread damage in clearance holes, making it perfect for construction equipment, industrial manufacturing, and transportation applications where high-strength bolts are critical for safety and performance.

Specification Summary & Compliance

This 3" length hex head screw features Class 2A thread fit for standard clearance applications with 5/8"-11 UNC coarse threading and external hex drive. Manufactured to Grade 9 specifications with Rockwell C38 hardness and 180,000 PSI tensile strength. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets.