S-92865A438 5/8"-18 x 2 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 load-bearing capacity with 120,000 psi tensile strength for reliable performance in heavy-duty applications
- Superior corrosion resistance through zinc plating, extending service life in demanding environments
- Precise thread engagement with Class 2A fit and UNF fine threading for vibration-resistant connections
- Optimized torque transmission through external hex drive design and substantial 15/16" head width
- Consistent mechanical properties maintained by Rockwell C25 hardness and Grade 5 certification
- Maximum fastening versatility with fully threaded 2½" length for uniform stress distribution
- Industry-standard compatibility ensuring seamless integration with existing UNF threaded components
Professional Applications & Engineering Value
This Grade 5 steel hex head screw delivers critical engineering solutions where high tensile strength and vibration resistance are paramount. The UNF fine threading provides superior thread engagement compared to coarse threads, making it ideal for precision equipment assembly, heavy machinery frames, and structural applications where loosening under dynamic loads is a concern. The zinc plated finish creates a sacrificial barrier against oxidation, significantly extending service life in industrial environments exposed to moisture and chemicals. With full threading along the 2½" length, engineers achieve uniform clamping force distribution across the entire fastened joint, eliminating stress concentration points that can lead to material fatigue and failure.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with 5/8"-18 UNF fine threading configuration. Complies with ASME B18.2.1 dimensional specifications and SAE J429 Grade 5 mechanical requirements, ensuring consistent quality and performance. Meets RoHS 3 (2015/863/EU) environmental compliance standards for restricted substance control. Features right-hand thread direction with external hex drive and fully threaded shank design for standardized industrial applications.
