S-90201A109 1/4"-20 x 1/2" 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 high-stress applications
• Superior corrosion protection through zinc yellow-chromate plating that extends service life in harsh environments
• Optimized installation efficiency with external hex drive design providing secure tool engagement and torque transmission
• Precise thread compatibility featuring UNC coarse threads with Class 2A fit for consistent engagement and vibration resistance
• Maximum fastening coverage through full threading along the entire 1/2" length for enhanced grip and distribution
• Rigorous quality assurance with Grade 9 certification and Rockwell C38 hardness ensuring dimensional stability under load
• Environmental compliance meeting RoHS 3 and REACH regulations for safe use across regulated industries

Professional Applications & Engineering Value

These Grade 9 hex head screws deliver critical performance advantages for heavy-duty industrial applications where failure is not an option. The combination of high-strength steel construction and zinc yellow-chromate plating addresses two primary engineering concerns: structural integrity under extreme loads and long-term corrosion resistance in demanding environments. The UNC coarse thread pattern with Class 2A fit ensures rapid installation while maintaining precise tolerances, reducing assembly time without compromising joint security. Particularly valuable in machinery assembly, structural frameworks, and equipment manufacturing, these fully threaded fasteners provide uniform stress distribution across the entire engagement length, preventing localized stress concentrations that can lead to premature failure.

Specification Summary & Compliance

Manufactured to inch system standards with precise 1/4"-20 UNC coarse threads maintaining Class 2A thread fit tolerances for consistent performance. The fastener meets Grade 9 strength classification requirements with verified Rockwell C38 hardness and 180,000 PSI tensile strength. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and regulatory acceptance across international markets. The external hex drive configuration with 7/16" head width provides standardized tool compatibility for industrial applications.