S-91268A325 1 1/4"-12 x 5" 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 environments
- Superior wear resistance due to Rockwell C33 hardness, ensuring extended service life under demanding conditions
- Precise thread engagement with Class 2A fit and UNF fine threading for secure fastening and vibration resistance
- Optimized torque transmission through the 1 7/8" external hex head design, enabling efficient installation with standard tools
- Reduced material stress concentration with partial threading along the 5" length, minimizing risk of shear failure
- Full regulatory compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability and quality
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for sustainable procurement
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where failure is not an option. The 1 1/4"-12 UNF fine threading provides superior resistance to vibrational loosening compared to coarse threads, while the partially threaded design concentrates strength where needed most. Manufactured from high-grade steel with Rockwell C33 hardness, this fastener maintains integrity under extreme loads and repetitive stress cycles. The external hex drive and substantial 1 7/8" head width ensure maximum torque application without stripping, making it ideal for construction, mining, and transportation applications requiring 150,000 psi tensile strength.
Specification Summary & Compliance
This 5" length hex head screw features Class 2A thread fit tolerances per UNF standards with 2 3/4" minimum thread length. Manufacturing complies with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, making it suitable for global industrial supply chains.
