S-91257A861 3/4"-10 x 7" 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 capability with 150,000 psi tensile strength for demanding industrial applications
- Superior corrosion resistance through zinc yellow-chromate plating that withstands harsh environments
- Optimized torque transmission with external hex drive and 1 1/8" head width for secure installation
- Reliable thread engagement with UNC coarse spacing and Class 2A fit ensuring vibration resistance
- Enhanced durability with Rockwell C33 hardness maintaining structural integrity under stress
- Versatile partial threading allowing both clamping and unthreaded shank functionality
- Industry compliance assurance meeting ASME B18.2.1 specifications for consistent performance
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 zinc yellow-chromate plated finish provides exceptional corrosion protection in challenging environments, while the UNC coarse thread spacing ensures rapid installation and superior resistance to vibration loosening. The partially threaded design offers optimal clamping force distribution, making it ideal for applications requiring both precise alignment and high tensile strength. With 150,000 psi tensile strength and Rockwell C33 hardness, this fastener maintains structural integrity under extreme loads, providing engineers with reliable performance in construction, manufacturing, and heavy equipment applications where failure is not an option.
Specification Summary & Compliance
Manufactured to exacting ASME B18.2.1 specifications with Class 2A thread fit tolerances ensuring precise engagement. The 3/4"-10 UNC coarse thread maintains consistent spacing across the 2" minimum threaded portion, while the 7" overall length provides substantial fastening capacity. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, this Grade 8 hex head screw meets international standards for industrial safety and sustainability requirements.
