S-91268A904 7/8"-9 x 4 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 applications.
- Superior corrosion resistance and durability from Grade 8 steel construction and Rockwell C33 hardness.
- Easy installation and removal with a standard 1 5/16" external hex head design for common tool compatibility.
- Secure fastening in coarse materials thanks to 7/8"-9 UNC coarse threading and Class 2A thread fit for precise engagement.
- Optimized weight distribution and shear resistance with a partially threaded shank design.
- Compliance with major industry standards including ASME B18.2.1 and SAE J429 for guaranteed quality and interchangeability.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for safe use in regulated industries.
Professional Applications & Engineering Value
This Grade 8 steel hex head screw is engineered to address critical challenges in heavy machinery, structural assembly, and industrial equipment. The 7/8"-9 UNC coarse thread ensures rapid installation and robust holding power in cast iron, thick steel plates, and other coarse-grained materials, reducing assembly time while minimizing strip-out risks. Its 150,000 psi tensile strength and Rockwell C33 hardness provide exceptional resistance to vibration loosening and fatigue, making it ideal for dynamic load environments. The partially threaded design concentrates strength where needed, preventing thread damage in unthreaded sections and enhancing shear performance. As a fully compliant industrial fastener, it delivers reliability in construction, automotive, and manufacturing sectors where failure is not an option.
Specification Summary & Compliance
This fastener features a Class 2A thread fit per UNC standards, ensuring consistent interchangeability and ease of assembly. It is manufactured in compliance with ASME B18.2.1 and SAE J429 specifications, guaranteeing dimensional accuracy and mechanical properties. The product is verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to strict environmental and safety regulations for hazardous substances.
