S-91247A450 5/8"-18 x 6" 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 a tensile strength of 120,000 psi, this screw reliably handles high-stress applications without failure.
- Superior Corrosion Resistance – Zinc plating provides a durable protective layer, extending service life in harsh industrial environments.
- Precise Thread Engagement – UNF fine threading and Class 2A fit ensure secure, vibration-resistant connections in critical assemblies.
- High Mechanical Strength – Grade 5 classification and Rockwell C25 hardness guarantee consistent performance under heavy loads.
- Optimized Drive Efficiency – External hex head design allows for high-torque installation with standard tools, reducing assembly time.
- Regulatory Compliance Assurance – Meets ASME B18.2.1 and SAE J429 standards, ensuring interoperability and safety in regulated industries.
- Environmental Responsibility – RoHS 3 and REACH compliance demonstrates commitment to restricted substance-free manufacturing.
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical performance in heavy machinery, structural steel connections, and industrial equipment where vibration resistance and load distribution are paramount. The 5/8"-18 UNF fine threading maintains clamping force under dynamic stresses, while the partial threading design provides optimal shear strength in bolted joints. Zinc plating creates a sacrificial barrier against oxidation in outdoor or high-moisture environments, significantly reducing maintenance cycles. Engineered to ASME B18.2.1 specifications, these screws provide reliable fastening solutions for construction, automotive, and manufacturing applications requiring certified components.
Specification Summary & Compliance
Manufactured to Class 2A thread tolerances with UNF (Unified National Fine) thread form per ASME standards. Complies with ASME B18.2.1 dimensional requirements and SAE J429 Grade 5 mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental directives. Material certification available for traceability.
