S-90201A685 1"-8 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 the most demanding heavy-duty applications, preventing fastener failure under extreme loads.
• Superior corrosion resistance from the zinc yellow-chromate plating protects the screw in harsh industrial environments, significantly extending its service life.
• High hardness rating of Rockwell C38 provides excellent wear resistance and durability, maintaining thread integrity through repeated use and high-torque installation.
• Coarse 1"-8 UNC thread with a Class 2A fit allows for faster installation and easier alignment, reducing assembly time and labor costs.
• Partially threaded design offers a strong, unthreaded shank for enhanced shear strength, making it ideal for applications requiring precise clamping.
• External hex drive and hex head design enables high-torque installation with standard tools, ensuring a secure and tight fit.
• Full compliance with RoHS 3 and REACH regulations guarantees the product is safe for use in regulated industries and global markets.

Professional Applications & Engineering Value

This Grade 9 hex head screw is engineered to solve critical challenges in heavy-duty industrial applications, such as structural steel framing, heavy machinery assembly, and construction equipment. The combination of high-strength steel and a Rockwell C38 hardness rating ensures it can withstand severe vibrational forces and dynamic loads without stripping or shearing. The zinc yellow-chromate plating provides a robust barrier against rust and corrosion, which is essential for outdoor or chemically exposed environments. The 1"-8 UNC coarse thread and Class 2A thread fit offer excellent grip and quick assembly, reducing downtime in production lines. Its partially threaded design concentrates strength where it's needed most, providing superior clamping force for critical joints. This makes it an indispensable industrial fastener for engineers seeking reliability, compliance, and long-term performance.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and a 1"-8 UNC coarse thread profile. It is manufactured from high-grade steel to meet the rigorous requirements of Grade 9 strength classification. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in environmentally conscious and regulated industrial markets.