S-91247A823 5/8"-11 x 8 1/2" 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 that extends service life in harsh industrial environments
- Optimized thread engagement with coarse UNC threading and Class 2A fit for faster assembly and secure fastening
- Enhanced durability from Rockwell C25 hardness that maintains structural integrity under repeated stress
- Efficient installation and removal with external hex drive design providing maximum torque transfer
- Versatile partial threading allowing for both clamping and alignment functions in structural applications
- Industry-standard compliance ensuring consistent quality and performance across industrial projects
Professional Applications & Engineering Value
These Grade 5 hex head screws deliver critical engineering solutions for heavy-duty industrial applications where failure is not an option. The zinc plated steel construction provides essential corrosion protection in manufacturing facilities, construction sites, and machinery assembly. The coarse UNC threading (5/8"-11) ensures rapid installation and superior resistance to vibration loosening, while the partial threading design offers precise clamping control in structural steel connections, equipment mounting, and framework assembly. The external hex drive accommodates high-torque applications, making these industrial screws ideal for critical joints requiring both strength and reliability in demanding environments.
Specification Summary & Compliance
This 8 1/2" heavy-duty fastener features precise Class 2A thread fit tolerances and 5/8"-11 UNC coarse threading manufactured to exacting standards. The screw complies with ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming the absence of restricted substances for global industrial use.
