S-91268A225 1 1/4"-7 x 6 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 thanks to Grade 8 steel construction and Rockwell C33 hardness
- Reliable fastening performance with Class 2A thread fit ensuring precise engagement and vibration resistance
- Easy installation and removal with external hex drive and 1 7/8" head width for standard tool compatibility
- Optimized for heavy-duty applications featuring coarse UNC threading for faster assembly in tough materials
- Versatile partial threading design allowing both secure clamping and adjustment flexibility
- Full regulatory compliance meeting ASME B18.2.1, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value in demanding industrial environments where failure is not an option. The 1 1/4"-7 UNC coarse thread configuration provides superior pull-out resistance in structural steel, heavy machinery, and construction applications, while the partially threaded design ensures optimal clamp load distribution. Manufactured from high-grade steel with Rockwell C33 hardness, this fastener withstands extreme vibration, shock loads, and environmental stressors that compromise inferior fasteners. The external hex drive and substantial 1 7/8" head width enable high-torque installation without stripping, making it ideal for maintenance operations and assembly lines where reliability and speed are critical.
Specification Summary & Compliance
This heavy-duty hex head screw features precise Class 2A thread fit tolerances with 1 1/4"-7 UNC coarse thread spacing and 3" minimum thread length. Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 8 standards, it ensures consistent performance across industrial applications. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material transparency for global supply chains.
