S-91236A804 5/8"-11 x 2 1/2" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws
Low-Strength 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
- Enhanced corrosion resistance with zinc plating for extended service life in harsh industrial environments
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and stress
- Class 2A thread fit provides smooth assembly and consistent engagement for efficient installation
- Coarse UNC threading offers superior resistance to vibration loosening and faster installation times
- External hex drive design allows for high-torque application with standard tools, reducing installation time
- Rockwell B69 hardness delivers excellent durability and wear resistance for long-term use
- Partial threading provides unthreaded shank for precise clamping and shear strength in structural applications
Professional Applications & Engineering Value
These heavy-duty hex head screws are engineered to solve critical fastening challenges in demanding industrial settings. The steel construction with zinc plating combats corrosion in environments exposed to moisture and chemicals, while the 5/8"-11 UNC coarse thread design prevents vibration-induced loosening in machinery, construction, and transportation equipment. With 60,000 psi tensile strength and Rockwell B69 hardness, they maintain structural integrity under extreme loads, making them ideal for structural steel connections, heavy equipment assembly, and infrastructure projects where reliability is paramount. The external hex drive and Class 2A thread fit ensure quick, secure installation with standard tools, reducing labor costs and downtime.
Specification Summary & Compliance
This 5/8"-11 UNC hex head screw features precise Class 2A thread fit per ASME standards, with dimensions including 2 1/2" length, 15/16" head width, and 27/64" head height in inch system measurements. Manufactured to meet ASME B18.2.1 and ASTM A307 specifications, it ensures consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and regulatory adherence for global industrial applications.
