S-91247A437 5/8"-18 x 2 1/4" 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 load-bearing capability with 120,000 PSI tensile strength for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating, extending service life in industrial environments
- Precise thread engagement with Class 2A fit and UNF fine threads ensuring vibration-resistant connections
- Optimized torque transmission via external hex drive design for easy installation with standard tools
- Controlled thread engagement through partial threading design for improved stress distribution
- Consistent hardness performance with Rockwell C25 rating maintaining structural integrity under load
- Regulatory compliance assurance meeting ASME B18.2.1 standards and environmental regulations
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 5/8"-18 UNF fine thread configuration provides superior clamping force distribution, while the zinc plated steel construction offers essential corrosion protection in demanding environments. The external hex drive design ensures reliable torque application during installation, and the partial threading optimizes stress distribution across fastened components. These hex head screws are engineered to prevent loosening under dynamic loads, making them ideal for machinery assembly, structural frameworks, and equipment manufacturing where 120,000 PSI tensile strength and consistent performance are non-negotiable requirements.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 specifications meeting SAE J429 requirements, this fastener features Class 2A thread fit tolerances for precise engagement. The 5/8"-18 UNF fine thread configuration ensures optimal performance in applications requiring fine adjustment capabilities. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, this Grade 5 hex head screw maintains Rockwell C25 hardness and 120,000 PSI tensile strength throughout its service life, providing reliable fastening solutions for industrial applications.
