S-91211A210 5/8"-11 x 2 1/2" 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 with nylon patch technology maintains secure fastening in temperatures from -55° to 250°F
- Exceptional load-bearing capacity with 150,000 psi tensile strength for heavy-duty applications
- Superior corrosion protection through zinc yellow-chromate plating for extended service life
- Reliable thread engagement with Class 2A thread fit ensuring precise installation
- Optimized for high-stress environments featuring Rockwell C33 hardness and Grade 8 strength classification
- Easy installation and removal with standard external hex drive and coarse UNC threading
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed performance
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these Grade 8 hex head screws deliver critical vibration resistance through their nylon patch thread locking technology, preventing loosening in machinery subjected to constant motion and thermal cycling. The zinc yellow-chromate plated steel construction provides superior corrosion protection in harsh operating conditions, while the 150,000 psi tensile strength and Rockwell C33 hardness ensure structural integrity under extreme loads. The partially threaded design with coarse UNC threading offers optimal clamping force distribution, making these 5/8"-11 hex screws ideal for heavy equipment, structural assemblies, and automotive applications where reliability cannot be compromised.
Specification Summary & Compliance
This 5/8"-11 UNC hex head screw features Class 2A thread fit tolerance for precise engagement and coarse thread spacing for rapid installation. Manufactured to meet ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and performance reliability. The fastener complies with industry standards for Grade 8 strength classification with verified 150,000 psi tensile strength and Rockwell C33 hardness. The nylon patch thread locker maintains effectiveness across the specified temperature range of -55° to 250°F, providing consistent locking performance in varied operating environments.
