S-90211A340 1/2"-13 x 2 1/2" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws
Left-Hand Threaded High-Strength 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 Grade 8 strength rating and 150,000 psi tensile strength for critical applications
- Superior corrosion resistance through zinc yellow-chromate plating that protects against harsh industrial environments
- Precise thread engagement with Class 3A thread fit ensuring reliable fastening in high-vibration settings
- Exceptional durability from Rockwell C33 hardness that maintains performance under repeated stress
- Reverse-threading security with left-hand UNC coarse threads for specialized machinery and safety-critical assemblies
- Full-threaded design providing consistent clamping force along the entire 2½" length
- Standard compliance assurance meeting SAE J429 specifications for guaranteed quality and interoperability
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these Grade 8 hex head screws deliver exceptional performance where reverse-threading requirements and high tensile strength are critical. The left-hand UNC coarse thread configuration provides secure fastening in rotating machinery where standard right-hand threads might loosen, while the zinc yellow-chromate plated finish offers superior corrosion protection in challenging environments. The external hex drive design allows for high-torque installation, making these steel fasteners ideal for heavy equipment, automotive systems, and structural assemblies requiring Class 3A thread fit precision. Their fully threaded construction ensures maximum engagement in thick materials, providing reliable, vibration-resistant connections that maintain integrity under extreme loads.
Specification Summary & Compliance
This 1/2"-13 x 2½" left hand hex head screw features UNC coarse thread spacing with Class 3A thread fit tolerance for precise engagement. Manufactured from high-strength steel with Rockwell C33 hardness and 150,000 psi tensile strength, the fastener complies with SAE J429 specifications for Grade 8 requirements. The zinc yellow-chromate plating provides corrosion resistance while meeting industry standards for heavy-duty applications.
