S-91257A743 1/2"-13 x 10" 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
- Maximum load-bearing capacity with 150,000 psi tensile strength for critical structural applications
- Superior corrosion resistance through zinc yellow-chromate plating in harsh industrial environments
- Enhanced durability with Rockwell C33 hardness to withstand repeated stress and vibration
- Reliable thread engagement with Class 2A fit and coarse UNC threading for faster assembly
- Optimized torque transmission through external hex drive design and 3/4" head width
- Partial threading design provides unthreaded shank for precise clamping in structural connections
- Regulatory compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance in construction, machinery assembly, and structural steel connections. The 1/2"-13 UNC coarse thread configuration ensures rapid installation while maintaining secure fastening in high-vibration environments. The zinc yellow-chromate plating provides critical corrosion protection, extending service life in exposed conditions. With partial threading and 10" length, these fasteners offer precise load distribution across the unthreaded shank, preventing joint loosening under dynamic loads. The external hex drive and substantial head dimensions facilitate high-torque installation using standard industrial tools, making them ideal for maintenance, repair, and OEM applications requiring Grade 8 strength classification.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with 1/2"-13 UNC coarse thread specifications. Complies with ASME B18.2.1 and SAE J429 Grade 8 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements for environmental and safety regulations. Features Rockwell C33 hardness and 150,000 psi tensile strength as specified for Grade 8 fasteners.
