S-91268A807 5/8"-11 x 1 1/4" 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 reliable performance in high-stress applications
- Superior wear resistance due to Rockwell C33 hardness, ensuring extended service life in demanding environments
- Quick installation and removal with external hex drive design that provides secure tool engagement
- Optimal thread engagement through UNC coarse threading that resists vibration loosening and cross-threading
- Precise mechanical fit with Class 2A thread tolerance for consistent assembly quality
- Full-length thread coverage enables versatile positioning and maximum grip length
- Regulatory compliance assurance meeting industry standards for safety and environmental requirements
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions for heavy-duty industrial applications where failure is not an option. The steel construction combined with 150,000 psi tensile strength provides exceptional resistance to shear and tensile forces in machinery, structural assemblies, and equipment frames. The UNC coarse threading offers superior performance in materials where fine threads might strip or fail, while the external hex drive ensures maximum torque transmission without cam-out. These fully threaded fasteners maintain consistent clamping force across the entire 1 1/4" length, making them ideal for applications requiring uniform stress distribution and vibration resistance in construction, automotive, and manufacturing sectors.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 5/8"-11 UNC coarse threading and right-hand thread direction. Complies with ASME B18.2.1 and SAE J429 Grade 8 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial applications.
