S-91211A199 1/2"-13 x 5" 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
- Exceptional strength and durability with Grade 8 classification, supporting up to 150,000 psi tensile strength for demanding industrial applications.
- Reliable vibration resistance through the nylon patch thread locker, maintaining secure fastening in temperatures from -55°F to 250°F.
- Superior corrosion protection with zinc yellow-chromate plating on steel, extending service life in harsh environments.
- Easy installation and removal using the external hex drive and 3/4" head width, compatible with standard tools for efficient maintenance.
- Optimized load distribution due to the 1/2"-13 UNC coarse thread spacing and Class 2A thread fit, reducing the risk of stripping.
- Versatile partial threading design allows for precise clamping force control in assemblies requiring unthreaded shank sections.
- High hardness rating of Rockwell C33 ensures resistance to wear and deformation under heavy loads.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial use, this Grade 8 hex head screw combines zinc yellow-chromate plated steel with a nylon patch locking mechanism to address common challenges like vibration-induced loosening and corrosion in machinery, construction, and automotive assemblies. The 1/2"-13 UNC coarse thread and partial threading provide enhanced grip and stress distribution, ideal for applications where joint integrity is critical. By meeting ASME B18.2.1 and SAE J429 standards, it ensures consistency and reliability, reducing downtime and maintenance costs in high-stress environments.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances for precise engagement, with UNC coarse thread spacing and a right-hand thread direction. It complies with ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and performance. The zinc yellow-chromate plating offers RoHS and REACH compliance for environmental safety, while the Grade 8 strength classification guarantees durability in accordance with industrial norms.
