S-91247A596 5/16"-18 x 3 1/4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 120,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
- Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and vibration resistance
- Enhanced durability with Rockwell C25 hardness, maintaining structural integrity under repeated stress
- Versatile partial threading design providing both gripping power and clearance where needed
- Secure external hex drive allowing high torque application with standard tools
- Full regulatory compliance meeting ASME, SAE, RoHS 3 and REACH standards for quality assurance
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering solutions for heavy-duty industrial applications where reliability is paramount. The steel construction with zinc plating provides essential corrosion protection in manufacturing environments, while the UNC coarse threading ensures rapid installation and superior resistance to vibration loosening. The partially threaded design offers precise clamping force control, making it ideal for machinery assembly, structural frameworks, and equipment manufacturing where both strength and precise positioning are required. With its external hex drive and 3 1/4" length, this fastener accommodates standard tools and thick material sections commonly encountered in construction and industrial machinery applications.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with 5/16"-18 UNC coarse threading and right-hand thread direction. Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance. Meets environmental standards including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. Features a minimum thread length of 7/8" and is rated for Grade 5 strength classification with verified mechanical properties.
