S-91268A335 1 1/4"-12 x 7" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Maximum load-bearing capability with 150,000 psi tensile strength for critical structural applications
- Superior wear resistance due to Rockwell C33 hardness, extending service life in demanding environments
- Precise thread engagement with Class 2A fit and UNF fine threads for vibration-resistant connections
- Optimized torque transmission through the external hex drive and large 1 7/8" head width
- Reduced material stress concentration through partial threading design below the 3" minimum thread length
- Full regulatory compliance meeting ASME B18.2.1 and SAE J429 standards for quality assurance
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for global supply chain integration
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value for heavy machinery, structural steel connections, and industrial equipment assembly. The 1 1/4"-12 UNF fine thread configuration provides superior resistance to vibrational loosening compared to coarse threads, while the partial threading design minimizes stress concentration points along the shank. The external hex drive with substantial head dimensions ensures reliable torque application during installation, preventing tool slippage in high-torque scenarios. Manufactured from high-strength steel with controlled hardness, this fastener maintains integrity under extreme static and dynamic loads, making it ideal for construction, mining equipment, and transportation applications where failure is not an option.
Specification Summary & Compliance
This 7" length hex head screw features 1 1/4"-12 UNF fine threads with Class 2A thread fit tolerance, ensuring precise engagement with mating components. The fastener conforms to ASME B18.2.1 dimensional specifications and SAE J429 Grade 8 mechanical properties, guaranteeing consistent performance across applications. Manufacturing compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming the absence of restricted substances for international market acceptance.
