S-91268A119 1 1/8"-7 x 4" 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 critical structural applications
- Superior wear resistance thanks to Rockwell C33 hardness and Grade 8 steel construction
- Optimized thread engagement with Class 2A UNC coarse threads for faster assembly and reduced cross-threading risk
- Enhanced installation efficiency through external hex drive design and 1 11/16" head width for secure tool engagement
- Reliable partial threading providing unthreaded shank section for improved shear strength in demanding applications
- Long-term corrosion resistance with compliant steel material meeting RoHS 3 and REACH environmental standards
- Industry-proven compatibility manufactured to ASME B18.2.1 specifications for consistent performance across industrial equipment
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance in construction machinery, structural steel connections, and high-vibration equipment. The 1-1/8"-7 UNC coarse thread configuration ensures rapid installation while maintaining Class 2A thread fit precision for consistent clamping force. The partially threaded design provides an unthreaded bearing surface that significantly enhances shear strength, making these steel fasteners ideal for pivot points and structural joints subject to dynamic loads. With 150,000 psi tensile strength and Rockwell C33 hardness, they withstand extreme mechanical stress while the external hex drive accommodates standard industrial tools for efficient maintenance and assembly operations.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 specifications with SAE J429 Grade 8 certification, these screws feature Class 2A thread fit tolerances for precise engagement. The 1-1/8"-7 UNC coarse thread pattern ensures compatibility with standard components while the 4" length with 2-1/2" minimum thread length provides versatile fastening solutions. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe use across various industrial sectors.
