S-90201A657 3/4"-10 x 4 1/2" 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 applications, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments.
• High hardness rating (Rockwell C38) provides excellent wear resistance and durability under heavy loads.
• Coarse UNC threading allows for quicker installation and better performance in materials prone to stripping or vibration.
• Partial threading design offers optimal grip and clamping force where full threading isn't required.
• External hex drive with large 1 1/8" head width enables easy installation and high torque application with standard tools.
• Compliance with RoHS 3 and REACH ensures environmental safety and meets international regulatory standards for industrial use.

Professional Applications & Engineering Value

This Grade 9 hex head screw delivers critical engineering solutions for heavy-duty applications where failure is not an option. The combination of high-strength steel material and zinc yellow-chromate plating addresses common industrial challenges including structural fatigue, corrosion in outdoor or chemical environments, and vibration-induced loosening. The 3/4"-10 UNC coarse thread provides superior holding power in steel frameworks, construction equipment, and machinery assemblies, while the partial threading ensures maximum clamping force in bolted joints. These industrial hex bolts are engineered to maintain integrity under extreme pressure, making them ideal for critical infrastructure, heavy machinery, and structural applications where reliability and longevity are paramount.

Specification Summary & Compliance

This heavy-duty fastener features Class 2A thread fit tolerance for reliable assembly compatibility, UNC coarse thread standard with right-hand direction, and partial threading extending to a minimum of 1 3/4". Manufactured to meet Grade 9 strength requirements with verified 180,000 psi tensile strength and Rockwell C38 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.