S-90409A126 5/16"-18 x 1 3/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws
High-Strength Grade 8 Steel Flanged 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 tensile strength of 150,000 psi provides superior resistance to breaking under extreme loads
- Rockwell C32 hardness ensures excellent wear resistance and long-term durability in demanding applications
- Flange design eliminates the need for separate washers while providing superior load distribution
- Grade 8 steel construction delivers maximum reliability for critical heavy-duty applications
- Coarse UNC threading enables faster installation and better performance in vibration-prone environments
- External hex drive allows for high-torque installation with standard tools and easy removal
- Partial threading provides optimal grip length while maintaining unthreaded shank strength
Professional Applications & Engineering Value
These Grade 8 steel hex head screws are engineered to solve critical fastening challenges in industrial environments where vibration resistance and structural integrity are paramount. The partially threaded design with UNC coarse threading ensures secure fastening in machinery, heavy equipment, and structural applications where loosening under dynamic loads is a concern. The integrated flange provides enhanced bearing surface, distributing clamp load more effectively than standard hex screws. With their external hex drive and Class 2A thread fit, these screws deliver reliable performance in automotive, construction, and manufacturing applications where consistent torque values and repeatable fastening are essential for operational safety and equipment longevity.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (5/16"-18) and compliant with IFI 111/SAE J429 specifications. These screws meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring they are free from hazardous substances. The Grade 8 classification guarantees consistent mechanical properties including the specified 150,000 psi tensile strength and Rockwell C32 hardness throughout production batches.
