S-91247A479 3/4"-16 x 3" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 120,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
- Precise thread engagement with Class 2A fit and UNF fine threading for vibration-resistant connections
- Optimized torque transmission through external hex drive and 1 1/8" head width for easy installation
- Enhanced durability with Rockwell C25 hardness maintaining structural integrity under stress
- Versatile partial threading allowing unthreaded shank sections for shear load distribution
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering solutions for heavy-duty industrial applications where fastener failure is not an option. The 3/4"-16 UNF fine threading provides superior resistance to vibrational loosening compared to coarse threads, while the zinc plated steel construction offers essential protection against corrosion in manufacturing environments. The partially threaded design with 1 3/4" minimum thread length allows for precise clamp load control, making these external hex drive fasteners ideal for machinery assembly, structural steel connections, and equipment maintenance where 120,000 psi tensile strength ensures joint integrity under extreme operational stresses.
Specification Summary & Compliance
Manufactured to exacting inch system dimensions with Class 2A thread fit tolerance ensuring consistent mating with standard nuts. Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, confirming absence of restricted substances. The Grade 5 classification guarantees consistent 120,000 psi tensile strength and Rockwell C25 hardness across production batches for reliable performance in critical applications.
