S-91268A345 1 1/4"-12 x 10" 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 wear resistance due to Rockwell C33 hardness, ensuring long service life under high-stress conditions
- Precise thread engagement with Class 2A fit and UNF fine threads for reliable, vibration-resistant connections
- Optimized torque transmission through the external hex drive and large 1 7/8" head for easy installation with standard tools
- Versatile partial threading with 3" minimum thread length providing both gripping strength and clearance where needed
- Full regulatory compliance meeting ASME B18.2.1, SAE J429, RoHS 3 and REACH standards for global industrial use
- Heavy-duty construction from Grade 8 steel, specifically engineered for critical structural applications
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers engineering solutions for heavy machinery, structural steel connections, and industrial equipment where failure is not an option. The 1 1/4"-12 UNF fine thread configuration provides superior resistance to vibrational loosening compared to coarse threads, while the partially threaded design allows for both clamping force and clearance in complex assemblies. Manufactured from high-strength steel with Rockwell C33 hardness, this fastener maintains integrity under extreme loads and repetitive stress cycles. The external hex drive and substantial head size ensure reliable torque application during installation, reducing the risk of stripping and ensuring proper preload in critical joints.
Specification Summary & Compliance
This 10" length hex head screw features Class 2A thread fit per UNF standards with 1 1/4"-12 fine threading and 3" minimum thread length. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, it delivers consistent dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
