S-90201A339 3/8"-16 x 4 1/2" Extreme-Strength Grade 9 Steel Hex Head Screws
Extreme-Strength Grade 9 Steel Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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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 industrial environmental damage
- Optimized torque transmission with external hex drive design ensuring secure installation and removal
- Enhanced durability from Rockwell C38 hardness that maintains structural integrity under repeated use
- Secure fastening performance with Class 2A thread fit providing consistent engagement and vibration resistance
- Versatile partial threading allowing for both clamping force and adjustment flexibility in assembly
- Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial applications
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 9 hex head screws deliver exceptional mechanical properties where failure is not an option. The 3/8"-16 UNC coarse thread configuration provides excellent engagement in various materials while resisting vibration-induced loosening. The zinc yellow-chromate plating creates a protective barrier against corrosive environments, extending service life in manufacturing equipment, structural assemblies, and machinery. With partial threading design, these fasteners offer precise clamping force control while maintaining unthreaded shank strength. The combination of 180,000 psi tensile strength and Rockwell C38 hardness ensures these screws withstand extreme mechanical stresses without deformation, making them ideal for critical connections in construction, automotive, and heavy equipment industries where reliability and safety are paramount.
Specification Summary & Compliance
These hex head screws feature precise Class 2A thread fit per UNC standards with 3/8"-16 coarse thread specification and 4½" length. Manufactured from high-strength steel with zinc yellow-chromate plating finish, they comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The Grade 9 classification ensures consistent mechanical properties including 180,000 psi tensile strength and Rockwell C38 hardness for industrial applications requiring reliable fastening solutions.
