S-90211A294 3/8"-16 x 1 1/4" 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 - Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in high-stress industrial environments
- Superior Corrosion Protection - Zinc yellow-chromate plating provides enhanced resistance to rust and environmental degradation
- Precision Thread Engagement - Class 3A fit and UNC coarse threads deliver secure fastening with reduced risk of cross-threading
- Left-Hand Thread Security - Reverse threading direction prevents loosening in applications with counter-clockwise rotational forces
- Optimal Torque Transmission - External hex drive and 9/16" head width allow for high-torque installation with standard tools
- Full Thread Coverage - Completely threaded 1 1/4" length ensures maximum grip strength across the entire fastener
- Industry Compliance Assurance - SAE J429 specification compliance guarantees consistent quality and performance standards
Professional Applications & Engineering Value
Engineered for demanding industrial applications where reverse rotational forces and high tensile requirements are critical, these Grade 8 hex head screws provide exceptional reliability in machinery, equipment manufacturing, and heavy-duty assemblies. The left-hand UNC coarse threading with Class 3A fit ensures secure fastening in applications prone to vibration-induced loosening, while the zinc yellow-chromate plating offers superior corrosion resistance in harsh operating environments. The external hex drive design facilitates easy installation and removal with standard tools, making these fully threaded fasteners ideal for maintenance-intensive applications requiring frequent disassembly.
Specification Summary & Compliance
This 3/8"-16 UNC left hand hex head screw features precision Class 3A thread fit with coarse thread spacing, manufactured to exact dimensional tolerances. The fastener meets SAE J429 specifications for Grade 8 requirements, including 150,000 psi tensile strength and Rockwell C33 hardness. The zinc yellow-chromate plating provides corrosion protection while maintaining compliance with industry standards for heavy-duty mechanical applications.
