S-90201A221 5/16"-18 x 1" 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 resistance through zinc yellow-chromate plating that protects against harsh industrial environments
• Optimized thread engagement with Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
• Maximum hardness durability with Rockwell C38 rating providing excellent wear resistance and longevity
• Full-threaded design offering consistent clamping force along the entire 1" length for uniform load distribution
• Industry-standard compliance meeting RoHS 3 and REACH regulations for safe, environmentally responsible manufacturing
• Easy installation and removal with external hex drive design allowing for high-torque application using standard tools

Professional Applications & Engineering Value

These Grade 9 hex head screws deliver critical performance where high-strength fastening is non-negotiable. The zinc yellow-chromate plated steel construction addresses corrosion concerns in manufacturing facilities, outdoor equipment, and structural assemblies exposed to moisture and chemicals. The 5/16"-18 UNC coarse thread configuration provides rapid installation while maintaining Class 2A thread fit precision for consistent clamping force. Engineered for heavy machinery, construction equipment, and industrial frameworks, these fully threaded screws distribute stress evenly across the entire shank, preventing localized failure points. The external hex drive accommodates high torque requirements without stripping, making them ideal for maintenance applications requiring repeated disassembly and reassembly.

Specification Summary & Compliance

Manufactured to precise inch system dimensions with Class 2A thread fit tolerance ensuring proper engagement with standard nuts and threaded holes. These 5/16"-18 UNC coarse thread screws feature right-hand threading and meet industry standards for high-strength fasteners. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and chemical safety in industrial applications.