S-91257A775 9/16"-12 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 through zinc yellow-chromate plating that withstands harsh industrial environments
- Optimized torque transmission with external hex drive design for secure installation and removal
- Enhanced durability with Rockwell C33 hardness that maintains structural integrity under repeated stress
- Reliable thread engagement with Class 2A thread fit ensuring precise mating with nuts and threaded components
- Versatile partial threading allowing unthreaded shank sections for improved shear strength in structural applications
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed quality and interchangeability
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The 9/16"-12 UNC coarse thread configuration provides excellent vibration resistance in dynamic applications while the zinc yellow-chromate plating offers superior protection against corrosion in outdoor or chemically aggressive environments. The partially threaded design ensures maximum clamping force distribution, making these high-strength bolts ideal for applications requiring both tensile strength and shear resistance. With 150,000 psi tensile strength and Rockwell C33 hardness, these fasteners maintain integrity in critical load-bearing applications across construction, manufacturing, and heavy equipment sectors.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 9/16"-12 UNC coarse threading according to ASME B18.2.1 specifications. These Grade 8 hex head screws comply with SAE J429 standards for mechanical properties and meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. The 5" length with minimum 1 3/8" thread length ensures proper engagement in various material thicknesses while maintaining dimensional accuracy throughout the fastener.
