S-91286A803 1/2"-13 x 1 1/8" 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 provided by zinc-flake coating, extending service life in harsh industrial environments
- Optimized installation efficiency through external hex drive design and coarse UNC threading for faster assembly
- Consistent mechanical properties with Rockwell C33 hardness ensuring dimensional stability under heavy loads
- Precise thread engagement with Class 2A fit tolerance for secure fastening without galling or cross-threading
- Full-threaded design offering maximum grip length and uniform stress distribution across the entire fastener
- Regulatory compliance assurance meeting ASME B18.2.1 and SAE J429 specifications for quality and safety
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers exceptional performance in construction machinery, structural steel connections, and high-vibration equipment. The zinc-flake coated steel construction provides superior corrosion protection, significantly outperforming standard zinc plating in aggressive environments. The coarse UNC threading with Class 2A fit ensures rapid installation while maintaining precise tolerance control, reducing assembly time and labor costs. With fully threaded design and 150,000 psi tensile strength, this fastener distributes clamping forces evenly, preventing joint failure in critical applications where vibration resistance and long-term reliability are paramount.
Specification Summary & Compliance
This 1/2"-13 x 1-1/8" hex head screw features precision UNC coarse thread spacing with Class 2A tolerance for consistent fit and performance. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict chemical substance control.
