S-90201A527 5/8"-11 x 1 3/4" Extreme-Strength Grade 9 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 180,000 PSI tensile strength for reliable performance in demanding applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
• Optimized thread engagement through Class 2A fit UNC coarse threading, ensuring secure fastening and vibration resistance
• Enhanced durability with Rockwell C38 hardness, maintaining structural integrity under heavy loads
• Full threading design for maximum grip length and uniform stress distribution across the entire fastener
• Industry-standard compliance with RoHS 3 and REACH regulations, meeting global environmental and safety requirements
• External hex drive compatibility with standard tools for efficient installation and maintenance operations

Professional Applications & Engineering Value

This Grade 9 hex head screw delivers critical engineering solutions for heavy-duty industrial applications where failure is not an option. The combination of high-strength steel material and zinc yellow-chromate plating addresses common challenges of structural fatigue and environmental degradation in construction, machinery assembly, and infrastructure projects. The 5/8"-11 UNC coarse thread configuration with Class 2A fit provides superior resistance to loosening under vibration and dynamic loads, while the fully threaded design ensures maximum clamping force distribution. These industrial fasteners are engineered to maintain integrity in critical joints subjected to extreme tension and shear forces, making them ideal for structural steel connections, heavy equipment manufacturing, and transportation infrastructure where reliability and longevity are paramount.

Specification Summary & Compliance

Manufactured to precise inch system dimensions with Class 2A thread fit tolerance per UNC standards. The fastener features 5/8"-11 coarse threading with right-hand direction and measures 1 3/4" in length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring adherence to international industrial safety and substance restriction standards. The Grade 9 classification confirms consistent mechanical properties including specified tensile strength and hardness values.