S-90201A437 1/2"-13 x 3 1/2" Extreme-Strength Grade 9 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with Grade 9 strength rating and 180,000 psi tensile strength for critical structural applications
• Superior corrosion protection through zinc yellow-chromate plating that withstands harsh industrial environments
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring reliable installation and vibration resistance
• Enhanced driving efficiency via external hex drive and 3/4" head width for high-torque applications
• Precision partial threading providing unthreaded shank section for improved shear strength in joint assemblies
• Exceptional hardness performance with Rockwell C38 rating maintaining fastener integrity under extreme pressure
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial use

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these Grade 9 hex head screws deliver exceptional performance in construction, heavy machinery, and structural steel connections. The zinc yellow-chromate plated steel construction provides superior corrosion resistance in outdoor and high-moisture environments, while the 1/2"-13 UNC coarse threading ensures rapid installation and reliable grip in various materials. The partially threaded design concentrates strength where needed most, preventing thread stripping and maintaining joint integrity under vibration and dynamic loads. With external hex drive compatibility, these fasteners accommodate standard industrial tools for efficient assembly in tight spaces and high-torque scenarios.

Specification Summary & Compliance

This high-strength hex head screw features precision 1/2"-13 UNC coarse threads with Class 2A thread fit for consistent engagement and reliable performance. Manufactured to exacting standards with 3 1/2" length and 3/4" head width dimensions. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The fastener meets Grade 9 strength classification requirements with verified 180,000 psi tensile strength and Rockwell C38 hardness specifications.