S-90201A331 3/8"-16 x 3" Extreme-Strength Grade 9 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with Grade 9 classification and 180,000 PSI tensile strength, ensuring reliable performance under high stress.
• Superior corrosion resistance provided by the zinc yellow-chromate plating, extending service life in harsh industrial environments.
• High hardness rating of Rockwell C38 minimizes wear and deformation, maintaining fastener integrity through repeated use.
• Precision thread fit with Class 2A UNC coarse threads ensures easy installation and secure fastening in various materials.
• Optimized for high-torque applications thanks to the external hex drive and hex head design, allowing for efficient installation with standard tools.
• Versatile partial threading provides both gripping power in the threaded section and shear strength in the unthreaded shank.
• Compliance with environmental regulations including RoHS 3 and REACH, making them suitable for global industrial supply chains.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 9 hex head screws deliver exceptional reliability in construction, machinery, and structural assemblies where failure is not an option. The 3/8"-16 UNC coarse thread design provides excellent pull-out resistance in metals and composites, while the partial threading offers superior resistance to vibrational loosening. The zinc yellow-chromate plating creates a protective barrier against corrosion, significantly extending service life in outdoor or chemically aggressive environments. With 180,000 PSI tensile strength and Rockwell C38 hardness, these fasteners maintain clamping force under extreme loads, preventing joint failure in critical applications. The external hex drive design ensures compatibility with standard tools, streamlining installation in confined spaces.

Specification Summary & Compliance

These hex head screws feature 3/8"-16 UNC coarse threads with Class 2A thread fit for precise engagement and consistent performance. The 3-inch length with 1-inch minimum thread length provides optimal fastening capability. Manufactured to meet Grade 9 strength requirements with verified 180,000 PSI tensile strength and Rockwell C38 hardness. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.