S-90201A663 3/4"-10 x 5 1/2" Extreme-Strength Grade 9 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with Grade 9 rating and 180,000 psi tensile strength for critical structural applications
• Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring reliable installation and vibration resistance
• Enhanced driving efficiency with external hex drive and substantial 1 1/8" head width for high-torque applications
• Precision-engineered partial threading providing optimal clamp force distribution across the 5 1/2" length
• Consistent mechanical properties maintained through Rockwell C38 hardness for dependable performance under stress
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial deployment

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 9 hex head screws deliver exceptional performance in construction, machinery assembly, and structural frameworks where failure is not an option. The 3/4"-10 UNC coarse thread configuration provides superior resistance to vibrational loosening while enabling rapid installation in thick materials. The zinc yellow-chromate plating creates a robust barrier against corrosion, significantly extending service life in outdoor or chemically aggressive environments. With partial threading along the 5 1/2" length, these fasteners optimize clamp force distribution while the external hex drive accommodates high-torque applications without stripping. This combination of high tensile strength and corrosion resistance makes them ideal for critical connections in infrastructure, heavy equipment, and industrial machinery where reliability and durability are paramount.

Specification Summary & Compliance

These hex head screws feature precision 3/4"-10 UNC coarse threads manufactured to Class 2A thread fit tolerances ensuring consistent engagement and reliable performance. The fasteners maintain Grade 9 strength classification with verified 180,000 psi tensile strength and Rockwell C38 hardness. Manufacturing and material composition comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental responsibility and safety standards for industrial applications worldwide.