S-91286A473 3/4"-10 x 4 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 protection through zinc-flake coating, extending service life in harsh industrial environments
- Enhanced durability with Rockwell C33 hardness to resist wear and deformation under heavy loads
- Secure fastening with Class 2A thread fit ensuring precise engagement and vibration resistance
- Optimized installation efficiency featuring coarse UNC threads and external hex drive for quick assembly
- Reduced material stress through partial threading design that minimizes weight while maintaining strength
- Industry compliance assurance meeting ASME B18.2.1 and SAE J429 standards for quality and reliability
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance in demanding industrial settings where failure is not an option. The zinc-flake coated steel construction provides exceptional corrosion resistance, solving the common problem of fastener degradation in exposed or chemically aggressive environments. The 3/4"-10 UNC coarse thread configuration ensures rapid installation while maintaining superior clamping force, making them ideal for structural steel connections, heavy machinery assembly, and construction applications. With partial threading, these fasteners concentrate strength where needed most, preventing thread damage during installation while reducing overall weight. The external hex drive design accommodates standard tools for straightforward maintenance and disassembly, providing long-term serviceability in industrial maintenance and repair operations.
Specification Summary & Compliance
This heavy-duty hex head screw features precise Class 2A thread fit with 3/4"-10 UNC coarse thread specification and 4 1/2" length. Manufactured to ASME B18.2.1 and SAE J429 standards, ensuring dimensional accuracy and performance reliability. 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 strict material restrictions.
