S-91268A905 7/8"-9 x 5" 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, this screw withstands extreme mechanical stresses, reducing failure risks in demanding applications.
- Superior Hardness for Longevity - Rockwell C33 hardness ensures excellent wear resistance, maintaining structural integrity under repetitive loads.
- Optimized Thread Engagement - UNC coarse threads and Class 2A fit provide faster assembly and reliable grip in coarse-grained materials.
- High-Strength Material Compliance - Grade 8 steel construction meets rigorous ASME B18.2.1 and SAE J429 standards for consistent performance.
- Partial Threading for Precision Fastening - Allows unthreaded shank sections to bear shear loads directly, enhancing joint stability.
- Environmental Regulation Adherence - RoHS 3 and REACH compliance ensures safe usage in regulated industries without hazardous substances.
- Robust External Hex Drive - 1 5/16" head width enables high-torque installation with standard tools, minimizing stripping risks.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial systems, this Grade 8 hex head screw addresses critical challenges in machinery assembly, structural steel connections, and high-vibration environments. The 7/8"-9 UNC coarse thread design ensures rapid installation in thick materials like steel frames, while the partial threading concentrates clamping force precisely where needed. With 150,000 PSI tensile strength and Rockwell C33 hardness, it resists deformation under dynamic loads, making it ideal for construction equipment, automotive chassis, and industrial machinery requiring corrosion-resistant steel fasteners. The external hex drive accommodates high-torque wrenches, streamlining maintenance in confined spaces.
Specification Summary & Compliance
This screw maintains Class 2A thread fit per UNC standards, ensuring consistent engagement tolerance. Manufacturing adheres to ASME B18.2.1 and SAE J429 specifications for dimensional accuracy. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets global environmental and safety requirements for industrial use.
