S-91286A421 5/8"-11 x 5" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc-flake coating, extending service life in harsh industrial environments
- Optimized torque transmission through external hex drive design for secure installation and removal
- Enhanced thread engagement with UNC coarse threading that resists vibration loosening and simplifies alignment
- Precision thread fit meeting Class 2A standards for consistent performance and easy assembly
- Reduced weight without compromising strength through partial threading design while maintaining full structural integrity
- Industry-standard compliance ensuring compatibility with existing equipment and specifications
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers exceptional performance where reliability is critical. The zinc-flake coated steel construction provides superior protection against corrosion in demanding environments, from manufacturing facilities to outdoor equipment. The UNC coarse threading ensures rapid installation and maintains secure fastening even under intense vibration, while the external hex drive allows for high torque application without stripping. With partial threading optimizing weight distribution and the 5-inch length accommodating thick material assemblies, this fastener solves critical challenges in structural connections, machinery assembly, and heavy equipment maintenance where high-strength fastening solutions are essential for operational safety and longevity.
Specification Summary & Compliance
This 5/8"-11 hex head screw features precision Class 2A thread fit with UNC coarse threading standards. Manufactured to meet ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring verified material safety and environmental responsibility.
