S-90201A440 1/2"-13 x 4" Extreme-Strength Grade 9 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 180,000 PSI tensile strength and Grade 9 classification for demanding industrial applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
• Optimized thread engagement through UNC coarse threading and Class 2A fit ensures reliable fastening in various materials
• Enhanced installation efficiency with external hex drive and 3/4" head width for secure tool engagement and torque application
• Partial threading design allows for precise clamping force control and reduced thread damage in assembly operations
• Consistent performance reliability backed by Rockwell C38 hardness rating for maintained mechanical properties under stress
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for environmentally responsible manufacturing

Professional Applications & Engineering Value

This Grade 9 hex head screw delivers critical engineering solutions for heavy-duty industrial applications where failure is not an option. The combination of high-strength steel material and zinc yellow-chromate plating addresses common challenges in construction, machinery assembly, and structural frameworks exposed to corrosive elements. The 1/2"-13 UNC coarse thread configuration provides superior pull-out resistance in metal-to-metal connections, while the partial threading design prevents thread stripping in critical joint sections. With external hex drive compatibility, maintenance teams can achieve precise torque values during installation and servicing operations, reducing assembly time and improving workplace safety in demanding industrial environments.

Specification Summary & Compliance

This inch system fastener maintains Class 2A thread fit tolerances according to UNC standards, ensuring consistent threading performance across applications. The manufacturing process adheres to strict quality controls for dimensional accuracy, including 1/2" thread diameter, 1 1/4" minimum thread length, and 4" overall length. Regulatory compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, confirming environmental responsibility and chemical safety standards for industrial usage across global markets.