S-91286A444 5/8"-18 x 3" 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
- Precise thread engagement with Class 2A UNF fine threads ensuring secure fastening and vibration resistance
- Optimized torque transmission through external hex drive design for efficient installation and removal
- Enhanced durability from Rockwell C33 hardness, maintaining structural integrity under repeated stress
- Versatile partial threading allowing both clamping and alignment functions in complex assemblies
- Regulatory compliance assurance meeting ASME B18.2.1 and SAE J429 specifications for quality consistency
Professional Applications & Engineering Value
Engineered for heavy-duty industrial and automotive applications, these Grade 8 hex head screws address critical challenges in high-vibration environments. The 5/8"-18 UNF fine threading provides superior resistance to loosening under dynamic loads, while the partial threading design allows for precise clamping force distribution. The zinc-flake coated steel construction delivers exceptional corrosion protection in demanding conditions, from manufacturing equipment to vehicle chassis assemblies. With external hex drive compatibility, these fasteners enable efficient installation using standard tools, reducing assembly time while maintaining the 150,000 psi tensile strength required for structural integrity in critical connections.
Specification Summary & Compliance
This 3" length hex head screw features precise Class 2A thread fit with UNF fine threading (5/8"-18) and right-hand thread direction. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring strict material compliance standards.
