S-90201A683 1"-8 x 4" 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 Grade 9 classification and 180,000 PSI tensile strength for reliable performance in high-stress environments.
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh industrial conditions.
- Optimized torque application through the external hex drive and 1 1/2" head width, ensuring secure fastening with standard tools.
- Enhanced durability and wear resistance from Rockwell C38 hardness, maintaining structural integrity under repeated use.
- Efficient installation in coarse materials with 1"-8 UNC coarse threading and Class 2A fit, reducing cross-threading risks.
- Versatile partial threading design allowing for precise clamping force distribution across the 4" length.
- Compliance with environmental and safety standards including RoHS 3 and REACH, ensuring safe usage in regulated industries.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 9 hex head screw addresses critical challenges in construction, machinery assembly, and structural frameworks. The steel material combined with zinc yellow-chromate plating offers robust protection against rust and chemical exposure, ideal for outdoor or corrosive environments. Its 1"-8 UNC coarse thread and partial threading facilitate quick insertion into tough materials like steel beams or castings, minimizing installation time while providing consistent clamping force. The external hex drive and substantial head dimensions ensure high torque transmission without stripping, supporting reliable connections in vibrating equipment or load-bearing structures where failure is not an option.
Specification Summary & Compliance
This fastener adheres to UNC thread standards with Class 2A thread fit for consistent dimensional accuracy and interchangeability. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances. The inch system measurements, including 4" length and 1" thread diameter, are precision-engineered to meet industrial specifications for high-strength steel bolts in demanding applications.
