S-91257A941 7/8"-14 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 applications
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
- Precision fine threading (7/8"-14 UNF) ensures secure fastening and vibration resistance in critical assemblies
- Enhanced durability through Grade 8 steel construction and Rockwell C33 hardness for long-term reliability
- Optimized torque transmission via external hex drive design for efficient installation and removal
- Reduced assembly weight through partial threading while maintaining full structural integrity
- Industry compliance assurance meeting ASME B18.2.1 and SAE J429 standards for quality and interoperability
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The 7/8"-14 UNF fine thread configuration provides superior resistance to vibrational loosening in dynamic applications, while the zinc yellow-chromate plating offers enhanced protection against corrosion in demanding environments. The external hex drive enables high-torque installation without stripping, and the partially threaded design concentrates strength where needed most. With 150,000 psi tensile strength and Rockwell C33 hardness, this fastener maintains integrity under extreme loads, making it ideal for construction, manufacturing, and heavy equipment applications requiring reliable, high-strength fastening solutions.
Specification Summary & Compliance
This 5" length hex head screw features precision Class 2A thread fit with 7/8"-14 UNF fine threading and 2" minimum thread length. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and performance reliability. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict regulatory adherence.
