S-92865A444 5/8"-18 x 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 provided by zinc plating, extending service life in harsh environments
- Precise thread engagement with Class 2A fit and UNF fine thread for secure, vibration-resistant connections
- High-strength Grade 5 construction with Rockwell C25 hardness for durability under heavy loads
- Full threading design ensures maximum grip length and uniform stress distribution
- External hex drive compatibility allows for standard tooling and efficient installation
- Industry compliance with ASME B18.2.1 and SAE J429 specifications for quality assurance
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers exceptional engineering value for industrial applications requiring robust fastening solutions. The zinc plated steel construction provides critical corrosion protection in manufacturing environments, while the 5/8"-18 UNF fine thread configuration offers superior resistance to vibration loosening in machinery and structural assemblies. The fully threaded design ensures maximum engagement surface area, distributing stress evenly across the entire fastener length. With 120,000 psi tensile strength and Rockwell C25 hardness, these screws maintain integrity under heavy static and dynamic loads, making them ideal for construction equipment, industrial machinery, and automotive applications where failure is not an option.
Specification Summary & Compliance
Manufactured to precise inch system dimensions with Class 2A thread fit tolerance for consistent performance. Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Features right-hand UNF fine threads with 18 TPI spacing and meets RoHS 3 (2015/863/EU) environmental compliance standards. The external hex drive configuration (15/16" head width) ensures compatibility with standard industrial tools.
