S-91257A834 5/8"-18 x 6" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 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
- Maximum Load-Bearing Capacity – Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in high-stress industrial applications.
- Superior Corrosion Protection – Zinc yellow-chromate plating offers enhanced resistance to rust and environmental degradation, extending service life.
- Precision Thread Fit – Class 2A thread tolerance provides smooth assembly and secure fastening with reduced risk of cross-threading.
- Optimized Torque Application – External hex head design allows for high torque transfer using standard tools, improving installation efficiency.
- Durable Material Construction – Steel composition with Rockwell C33 hardness delivers excellent wear resistance and structural integrity.
- Versatile Partial Threading – Combines threaded engagement with an unthreaded shank for improved shear strength in dynamic loads.
- Regulatory Compliance Assurance – Meets ASME B18.2.1, SAE J429, RoHS 3, and REACH standards for safe, quality-assured usage.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this 5/8"-18 UNF Grade 8 hex head screw addresses critical challenges in machinery assembly, structural frameworks, and equipment manufacturing. The fine UNF thread and Class 2A fit ensure vibration resistance and precise alignment, reducing maintenance needs in high-vibration environments. With zinc yellow-chromate plating, the fastener withstands harsh conditions, including exposure to moisture and chemicals, while the partially threaded design enhances clamp load distribution. Ideal for construction, automotive, and aerospace sectors, it provides a reliable, high-strength solution that minimizes downtime and supports long-term operational safety.
Specification Summary & Compliance
This 6" hex head screw adheres to inch system measurements with a 5/8"-18 UNF fine thread and Class 2A thread fit for consistent dimensional accuracy. Manufactured in compliance with ASME B18.2.1 and SAE J429 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable usage across global markets.
