S-91257A927 7/8"-9 x 6 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 provided by zinc yellow-chromate plating, extending service life in demanding environments
- Optimized thread engagement through coarse UNC threading and Class 2A fit for secure fastening and vibration resistance
- Enhanced durability with Rockwell C33 hardness, maintaining structural integrity under heavy mechanical loads
- Secure installation and removal enabled by the external hex drive design for efficient torque application
- Partial threading design allows for precise clamping force distribution across connected components
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429 standards plus RoHS 3 and REACH environmental directives
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance in heavy machinery, structural steel connections, and industrial equipment where high tensile strength and corrosion resistance are paramount. The zinc yellow-chromate plating provides superior protection against environmental degradation, while the coarse UNC threading ensures rapid assembly and reliable performance in vibration-prone applications. The partially threaded design concentrates clamping force precisely where needed, preventing joint loosening in dynamic load conditions. Engineered to ASME B18.2.1 and SAE J429 specifications, these steel fasteners offer predictable performance characteristics that enable precise engineering calculations and reliable system integration across construction, manufacturing, and heavy equipment sectors.
Specification Summary & Compliance
This 7/8"-9 UNC hex head screw features Class 2A thread fit tolerances ensuring proper engagement and interchangeability. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 standards, the fastener delivers consistent mechanical properties including 150,000 psi tensile strength and Rockwell C33 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest restrictions on hazardous substances for industrial applications worldwide.
