S-91247A444 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 load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
- Precise thread engagement with Class 2A fit and UNF fine threads ensuring vibration-resistant connections
- Optimized torque transmission through external hex drive design for efficient installation with standard tools
- Controlled thread engagement with partial threading for strategic stress distribution along the shank
- Consistent mechanical properties meeting Grade 5 standards with Rockwell C25 hardness for dependable performance
- Regulatory compliance assurance with RoHS 3 and REACH standards for global manufacturing applications
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 5 hex head screws deliver exceptional reliability where vibration resistance and structural integrity are paramount. The 5/8"-18 UNF fine thread configuration provides superior clamping force in materials requiring precise thread engagement, while the zinc plating offers essential corrosion protection for extended service life in challenging environments. The partial threading design ensures optimal stress distribution, making these external hex drive fasteners ideal for machinery assembly, structural steel connections, and equipment manufacturing where high tensile strength and consistent performance are non-negotiable requirements.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 Grade 5 specifications with Class 2A thread fit tolerance ensuring precise dimensional accuracy. These 4" length hex head screws feature Rockwell C25 hardness and 120,000 psi tensile strength for guaranteed mechanical performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety standards are met for global industrial applications.
