S-90201A231 5/16"-18 x 2 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 tensile strength of 180,000 PSI for reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance with zinc yellow-chromate plating, extending service life in harsh environments and minimizing maintenance costs.
- High hardness rating of Rockwell C38 ensures excellent wear resistance and durability under repetitive loads.
- Precise Class 2A thread fit with UNC coarse threading for easy installation and secure fastening in various materials.
- Partially threaded design allows for controlled clamping force and reduced risk of thread damage during assembly.
- External hex drive and hex head provide straightforward tool engagement and high torque application for efficient installation.
- Compliance with RoHS 3 and REACH ensures environmental safety and meets global regulatory standards for industrial use.
Professional Applications & Engineering Value
This Grade 9 hex head screw is engineered to address critical challenges in heavy-duty applications, such as construction machinery, automotive assemblies, and structural frameworks. The steel material combined with zinc yellow-chromate plating offers robust protection against corrosion, essential for outdoor or humid conditions. With a 5/16"-18 UNC coarse thread and partial threading, it ensures optimal grip and load distribution, reducing vibration loosening. The external hex drive facilitates quick installation with standard tools, enhancing productivity in industrial settings where time and reliability are paramount.
Specification Summary & Compliance
This fastener adheres to inch system measurements with a Class 2A thread fit for consistent dimensional accuracy. It meets UNC thread standards and is manufactured to deliver high performance with 180,000 PSI tensile strength and Rockwell C38 hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), it ensures safety and environmental responsibility in industrial supply chains.
