S-94239A108 5/16"-18 x 1 1/4" SAE J429 High-Strength Grade 8 Steel Serrated-Flange Hex Head Screws
High-Strength Grade 8 Steel Serrated-Flange 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 150,000 psi tensile strength for demanding structural and machinery applications
- Superior corrosion resistance due to zinc-plated steel construction, extending service life in harsh environments
- Reliable, vibration-resistant locking provided by serrations under the flange, preventing loosening in dynamic operations
- Easy installation and high torque transfer with external hex drive and coarse UNC threads for quick assembly
- Consistent fit and interchangeability ensured by Class 2A thread fit, reducing assembly errors and rework
- Enhanced bearing surface and stability from the integrated flange, distributing clamp load effectively
- Full thread engagement along the 1 1/4" length for maximum grip and strength in thick materials
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered for heavy-duty industrial applications where failure is not an option. The zinc-plated steel material provides a durable barrier against rust and corrosion, crucial for outdoor equipment, automotive assemblies, and construction machinery. The UNC coarse thread and Class 2A fit enable rapid installation and reliable performance in high-vibration environments, reducing downtime and maintenance costs. The serrated locking flange eliminates the need for additional lock washers, simplifying inventory and assembly while ensuring joint integrity under dynamic loads. Ideal for securing critical components in agricultural, transportation, and manufacturing equipment, this fastener delivers consistent high-strength performance that meets rigorous engineering standards.
Specification Summary & Compliance
This screw features a 5/16"-18 UNC coarse thread with Class 2A fit for precise dimensional accuracy and easy assembly. Manufactured to meet IFI 111 and SAE J429 Grade 8 specifications, ensuring consistent mechanical properties and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental standards for global industrial use.
