S-91257A724 1/2"-13 x 3" 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 protects against harsh industrial environments
- Optimized torque transmission with external hex drive design ensuring secure installation and removal
- Enhanced durability from Rockwell C33 hardness that maintains structural integrity under repeated stress
- Reliable thread engagement with Class 2A thread fit providing consistent fastening performance
- Versatile partial threading allowing for both clamping and alignment functions in assembly applications
- Industry-standard compliance meeting ASME B18.2.1 specifications for guaranteed interchangeability
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions for heavy-duty industrial applications where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures these steel fasteners maintain structural integrity in high-vibration environments, construction equipment, and machinery assemblies. The zinc yellow-chromate plating provides superior corrosion protection, extending service life in demanding conditions. With 1/2"-13 UNC coarse threads and partial threading, these screws offer optimal clamping force distribution while allowing for precise alignment in structural connections. The external hex drive design ensures maximum torque application during installation, making them ideal for applications requiring high preload forces in automotive, manufacturing, and infrastructure projects.
Specification Summary & Compliance
These hex head screws feature precision Class 2A thread fit with 1/2"-13 UNC coarse threads and right-hand thread direction. Manufactured to exact ASME B18.2.1 specifications and SAE J429 Grade 8 requirements, ensuring dimensional accuracy and performance reliability. The fasteners are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety standards for industrial use.
