S-91247A461 5/8"-18 x 9" 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 that extends service life in harsh industrial environments
- Precise thread engagement with Class 2A thread fit ensuring consistent fastening and vibration resistance
- Optimized strength-to-weight ratio from Grade 5 steel construction with Rockwell C25 hardness
- Enhanced installation efficiency with external hex drive design allowing high torque application
- Versatile partial threading providing both gripping strength and alignment flexibility
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed quality
Professional Applications & Engineering Value
This Grade 5 hex head screw with 5/8"-18 UNF fine threading delivers critical engineering advantages for industrial assembly. The zinc plated steel construction combats corrosion in manufacturing facilities, outdoor equipment, and structural applications where environmental exposure is a concern. The partially threaded design allows the unthreaded shank to bear shear loads while the fine UNF threads provide superior resistance to vibration loosening compared to coarse threads. With external hex drive compatibility, installers can apply substantial torque for secure fastening in heavy machinery, construction projects, and transportation equipment where high tensile strength and reliability are non-negotiable requirements.
Specification Summary & Compliance
Manufactured to Class 2A thread fit tolerances with UNF (Unified National Fine) thread form ensuring precise engagement. This fastener complies with ASME B18.2.1 dimensional standards and SAE J429 Grade 5 mechanical properties. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety, making it suitable for global industrial markets with strict environmental requirements.
