S-91268A181 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
- Exceptional load-bearing capacity with 150,000 psi tensile strength for demanding industrial applications
- Superior durability and wear resistance due to Rockwell C33 hardness and Grade 8 steel construction
- Reliable fastening performance with Class 2A thread fit ensuring precise engagement and vibration resistance
- Easy installation and removal featuring a standard 1/2" external hex head for common tool compatibility
- Full UNC coarse threading provides excellent grip and faster assembly in various materials
- Compliance with major industry standards including ASME B18.2.1 for consistent quality and interchangeability
- Environmentally responsible manufacturing meeting RoHS 3 and REACH regulations for safe usage
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical reliability in heavy-duty industrial applications where failure is not an option. The 5/16"-18 UNC coarse thread design ensures rapid installation and superior holding power in steel frameworks, machinery assembly, and structural components. Manufactured from high-strength steel with Rockwell C33 hardness, it resists shear forces and material fatigue under constant stress. The fully threaded configuration provides consistent clamping force along the entire 1/2" length, while the external hex drive allows for high-torque application with standard tools. Ideal for construction, automotive, and manufacturing sectors requiring ASME B18.2.1 compliant fasteners that maintain integrity in high-vibration environments.
Specification Summary & Compliance
This inch-measurement fastener features 5/16"-18 UNC coarse threads with Class 2A thread fit for standard tolerance applications. Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 8 requirements, it ensures dimensional accuracy and mechanical consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, guaranteeing safe usage across industrial markets.
