S-91247A362 1/2"-20 x 3 1/2" 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 a 120,000 psi rating, this screw provides reliable load-bearing capacity for demanding structural and mechanical assemblies.
- Superior Corrosion Resistance: Zinc plating offers a durable protective barrier, extending service life in humid or outdoor industrial environments.
- Precision Fine Threading: The 1/2"-20 UNF fine thread and Class 2A fit ensure tight, secure fastening with reduced risk of loosening under vibration.
- High-Grade Material Integrity: Grade 5 steel with Rockwell C25 hardness delivers excellent wear resistance and durability for repeated use.
- Optimized Partial Threading: Allows for controlled clamping force and easier alignment in applications requiring specific unthreaded shank sections.
- Standard-Compliant Design: Manufactured to ASME B18.2.1 and SAE J429 specifications, ensuring interchangeability and reliability in professional settings.
- Easy Installation & Removal: The external hex drive and 3/4" head width enable quick, firm tool engagement with standard wrenches.
Professional Applications & Engineering Value
This Grade 5 steel hex head screw is engineered to address critical fastening challenges in heavy machinery, construction, and automotive sectors. The 1/2"-20 UNF fine thread provides superior resistance to vibrational loosening, while the zinc plating significantly reduces oxidation in corrosive environments. Its partially threaded design allows precise load distribution, making it ideal for assemblies where shear strength and joint integrity are paramount. With a 3 1/2" length and external hex drive, it ensures easy installation in confined spaces, supporting efficient maintenance and reducing downtime in industrial operations.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances per UNF standards, ensuring precise engagement. It meets ASME B18.2.1 and SAE J429 specifications for dimensional consistency and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material restrictions adherence.
