S-91257A814 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
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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
- Maximum load-bearing capacity with 150,000 psi tensile strength, ideal for high-stress industrial applications
- Superior corrosion resistance from zinc yellow-chromate plating, extending service life in harsh environments
- Reliable mechanical performance ensured by Grade 8 steel construction and Rockwell C33 hardness
- Easy installation and removal with external hex drive design and standard 5/8"-11 UNC coarse threading
- Precise thread engagement through Class 2A thread fit, reducing cross-threading risks
- Optimized weight distribution with partial threading, providing enhanced stability in structural connections
- Comprehensive regulatory compliance meeting ASME B18.2.1, SAE J429, RoHS 3 and REACH standards
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value in demanding industrial environments where failure is not an option. The combination of high-strength steel and zinc yellow-chromate plating addresses critical challenges in construction, heavy machinery, and structural applications by providing both exceptional tensile strength and corrosion resistance. The 5/8"-11 UNC coarse thread configuration ensures rapid installation in thick materials while maintaining secure fastening. Particularly valuable in partially threaded applications, this fastener provides optimal clamp force distribution where full threading isn't required, preventing joint loosening under vibration and dynamic loads. The external hex drive design accommodates standard tools for efficient assembly in confined spaces.
Specification Summary & Compliance
This hex head screw maintains Class 2A thread fit tolerance for consistent engagement and meets UNC coarse thread standards with 5/8"-11 threading. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance requirements. The fastener is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, ensuring environmental responsibility and regulatory adherence for global industrial applications.
