S-91268A223 1 1/4"-7 x 5 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 reliable performance in high-stress industrial environments
- Superior corrosion resistance and durability through Grade 8 steel construction with Rockwell C33 hardness rating
- Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring secure fastening and vibration resistance
- Enhanced installation efficiency through external hex drive design providing maximum torque application capability
- Versatile partial threading allowing for both clamping and alignment functions in complex assemblies
- Proven reliability meeting ASME B18.2.1 and SAE J429 standards for consistent quality and performance
- Environmental compliance with RoHS 3 and REACH regulations for safe use across global markets
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment where high tensile strength and vibration resistance are paramount. The 1 1/4"-7 UNC coarse thread configuration provides superior holding power in steel-to-steel applications, while the partial threading design allows for precise clamping force distribution. Manufactured from high-strength steel with Rockwell C33 hardness, these fasteners withstand extreme mechanical stresses without compromising integrity. The external hex drive facilitates efficient installation in confined spaces, making them ideal for construction, mining equipment, and heavy vehicle assembly where reliability cannot be compromised.
Specification Summary & Compliance
This 5 1/2 inch hex head screw features 1 1/4"-7 UNC coarse threads with Class 2A thread fit tolerance for precision engagement. The fastener meets ASME B18.2.1 dimensional specifications and SAE J429 Grade 8 mechanical requirements, ensuring consistent performance across industrial applications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, these screws are suitable for global distribution and use in regulated industries.
