S-90019A440 1/2"-13 x 1" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Thread-Locking Hex Head Screws
High-Strength Grade 8 Steel Thread-Locking 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
- Vibration-resistant locking: Permanent nylon patch thread locker prevents loosening under extreme vibration and shock loads
- Exceptional strength rating: Grade 8 classification with 150,000 psi tensile strength handles the most demanding heavy-duty applications
- Superior corrosion protection: Zinc yellow-chromate plating provides excellent rust resistance in harsh industrial environments
- Reliable thread engagement: Class 2A thread fit ensures consistent, precise installation with standard nuts and threaded components
- Wide temperature tolerance: Maintains locking performance across extreme temperatures from -55° to 250°F
- Optimized drive efficiency: External hex head design allows for high torque application with standard wrench tools
- Full thread coverage: Completely threaded shank provides maximum grip length and load distribution
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical performance where vibration resistance and structural integrity are paramount. The nylon patch thread locker embedded in the 1/2"-13 UNC coarse threads creates a permanent mechanical bond that eliminates the need for separate locking washers or chemical adhesives. Manufactured from zinc yellow-chromate plated steel, it withstands corrosive environments while maintaining the 150,000 psi tensile strength required for heavy machinery, structural steel connections, and high-vibration equipment. The external hex drive and Class 2A thread fit ensure quick installation and reliable performance in automotive, construction, and industrial manufacturing applications where failure is not an option.
Specification Summary & Compliance
This high-strength fastener features 1/2"-13 UNC coarse threads with Class 2A thread fit tolerance for precise engagement. The fully threaded design provides consistent performance along the entire 1" length. Manufactured to meet ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The Rockwell C33 hardness rating confirms the material's durability, while the zinc yellow-chromate plating offers environmental protection compliant with industrial corrosion resistance standards.
