S-92620A578 5/16"-18 x 1/2" 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 Resistance – Zinc yellow-chromate plating provides excellent protection against rust and environmental degradation.
- High Durability & Hardness – Rockwell C33 hardness rating offers exceptional wear resistance and long service life.
- Easy Installation & Removal – External hex drive and coarse UNC threads allow for quick assembly and disassembly with standard tools.
- Precise Thread Fit – Class 2A thread tolerance ensures consistent, secure fastening without cross-threading risks.
- Full Thread Engagement – Fully threaded design maximizes grip strength and distribution across the entire fastener length.
- Regulatory Compliance – Meets ASME B18.2.1, RoHS 3, and REACH standards for safe, industry-approved use.
Professional Applications & Engineering Value
Engineered for demanding environments, these Grade 8 hex head screws deliver unmatched reliability in heavy machinery, construction, and automotive assemblies. The steel construction combined with zinc yellow-chromate plating effectively combats corrosion, extending component life in humid or outdoor settings. Coarse UNC threads and Class 2A fit provide rapid installation and vibration resistance, reducing maintenance downtime. Ideal for structural frames, engine components, and equipment requiring 150,000 psi tensile strength, these fasteners ensure joint integrity under extreme loads while adhering to ASME B18.2.1 specifications for consistent quality.
Specification Summary & Compliance
This 5/16"-18 UNC hex head screw features a Class 2A thread fit with coarse spacing, 1/2" length, and full threading. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 standards, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe, restricted-substance-free usage in global industrial supply chains.
