S-91286A425 5/8"-11 x 5 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 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 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
- Enhanced durability through Rockwell C33 hardness, maintaining structural integrity under repeated stress
- Secure fastening performance with Class 2A thread fit ensuring proper engagement and vibration resistance
- Optimized installation efficiency through UNC coarse threading and external hex drive for quick assembly
- Reduced material fatigue with partial threading design that concentrates strength where needed most
- Industry-standard compatibility meeting ASME B18.2.1 specifications for reliable interchangeability
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers exceptional performance where failure is not an option. The steel construction combined with 150,000 psi tensile strength provides critical structural integrity for machinery, construction equipment, and automotive assemblies. The zinc-flake coated finish offers superior corrosion protection in challenging environments, while the UNC coarse threading ensures rapid installation and reliable holding power. The external hex drive and 15/16" head width provide excellent torque transmission during assembly, reducing installation time and labor costs. These partially threaded fasteners are specifically designed to concentrate strength in critical shear planes, making them ideal for structural connections, heavy equipment maintenance, and industrial machinery where vibration resistance and long-term reliability are paramount.
Specification Summary & Compliance
This 5/8"-11 hex head screw features Class 2A thread fit precision and UNC coarse threading standards for consistent performance. Manufacturing complies with ASME B18.2.1 specifications SAE J429, ensuring dimensional accuracy and mechanical properties. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant (06/10/2022 224 SVHC), meeting international environmental and safety standards for industrial use.
