S-91257A228 7/8"-9 x 8" 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
- Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
- Optimized torque transmission with external hex drive design for secure installation and removal
- Enhanced durability with Rockwell C33 hardness, maintaining structural integrity under heavy loads
- Secure fastening performance with Class 2A thread fit ensuring precise engagement and vibration resistance
- Industry-standard compatibility with UNC coarse threads for easy installation and replacement
- Reduced maintenance requirements through compliant manufacturing meeting RoHS 3 and REACH regulations
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering advantages for industrial applications where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness provides exceptional resistance to shear and tensile forces in heavy machinery, structural steel connections, and high-vibration environments. The zinc yellow-chromate plating creates a protective barrier against corrosion, significantly extending service life in outdoor or chemically aggressive settings. The 7/8"-9 UNC coarse thread design ensures rapid installation and superior holding power in various materials, while the external hex drive accommodates standard tools for efficient maintenance operations. These partially threaded screws offer precise clamping force control, making them ideal for critical joints in construction equipment, transportation systems, and industrial manufacturing where reliability and durability are paramount.
Specification Summary & Compliance
This 8-inch hex head screw features precise Class 2A thread fit with UNC coarse threading (7/8"-9) and partial threading configuration. Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 8 requirements, ensuring dimensional accuracy and mechanical performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety and material restrictions.
