S-90201A550 5/8"-11 x 5" 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 reliable performance in high-stress applications
• Superior corrosion resistance through Zinc Yellow-Chromate plating, extending service life in harsh industrial environments
• Optimized fastening control with partial threading design that prevents over-tightening and improves joint stability
• Precision thread engagement with Class 2A UNC coarse threads ensuring consistent installation and vibration resistance
• Enhanced installation efficiency through external hex drive design that accommodates standard wrenches for quick assembly
• Rigorous material integrity with Rockwell C38 hardness providing excellent wear resistance and durability
• Compliance with environmental regulations including RoHS 3 and REACH for safe use across global industrial sectors

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these Grade 9 hex head screws deliver critical performance where structural integrity is paramount. The steel construction combined with Zinc Yellow-Chromate plating provides exceptional protection against corrosion in outdoor, chemical, and high-moisture environments. The 5/8"-11 UNC coarse thread configuration ensures rapid installation and superior holding power in structural steel connections, heavy machinery assembly, and construction frameworks. With partial threading, these fasteners eliminate thread interference in clearance holes while maintaining maximum grip length. The external hex drive design allows for high-torque installation using standard tools, making them ideal for maintenance operations and production lines where reliability and speed are essential.

Specification Summary & Compliance

Manufactured to precise inch system dimensions with Class 2A thread fit tolerance for consistent performance. Complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features UNC coarse threads with right-hand direction and meets Grade 9 mechanical properties including 180,000 psi tensile strength and Rockwell C38 hardness specifications.