S-91247A359 1/2"-20 x 2 3/4" 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 tensile strength with 120,000 psi rating for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating that protects against environmental degradation
- Precise thread engagement with Class 2A fit and UNF fine threads ensuring secure fastening
- Optimized torque transmission via external hex drive design for easy installation and removal
- Enhanced durability from Rockwell C25 hardness that maintains integrity under heavy loads
- Versatile partial threading allowing both clamping and alignment functions in assemblies
- Industry compliance meeting ASME B18.2.1 and SAE J429 specifications for quality assurance
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering solutions for heavy-duty industrial applications where vibration resistance and structural integrity are paramount. The zinc plated steel construction provides essential corrosion protection in harsh environments, while the 1/2"-20 UNF fine threading offers superior resistance to loosening under dynamic loads. The partially threaded design allows for precise clamping force distribution, making it ideal for machinery assemblies, structural frameworks, and equipment manufacturing. With external hex drive compatibility, installation and maintenance are streamlined using standard tools, reducing assembly time and labor costs in industrial settings.
Specification Summary & Compliance
This fastener maintains Class 2A thread fit tolerance according to UNF standards, ensuring precise mating with corresponding nuts. Manufacturing complies with ASME B18.2.1 and SAE J429 Grade 5 specifications for dimensional accuracy and mechanical properties. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental regulations for hazardous substances. Thread spacing follows fine thread specifications with right-hand orientation, providing optimal performance in inch-system applications requiring high clamping forces and vibration resistance.
