S-90409A138 3/8"-16 x 2 1/2" 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 strength for demanding applications with Grade 8 classification and 150,000 psi tensile strength, ensuring reliable performance under high stress.
- Superior durability and wear resistance provided by Rockwell C32 hardness, extending the service life of the fastener in harsh industrial environments.
- Secure and stable fastening with the integrated flange design, which acts as a built-in washer to distribute load and prevent loosening.
- Easy installation and removal thanks to the external hex drive and coarse UNC thread, allowing for quick assembly with standard tools.
- Precise thread engagement ensured by the Class 2A thread fit, reducing the risk of cross-threading and providing consistent clamping force.
- Versatile partial threading offers an unthreaded shank for added shear strength, ideal for applications requiring precise grip length.
- Compliance with major industry standards including IFI 111 and SAE J429, guaranteeing quality and interoperability in professional settings.
Professional Applications & Engineering Value
This Grade 8 steel hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assembly, where failure is not an option. The 3/8"-16 UNC coarse thread and partial threading enhance vibration resistance and provide a secure hold in dynamic load conditions. The flanged design eliminates the need for separate washers, streamlining installation and reducing component count. Made from high-strength steel and finished to resist corrosion, it ensures long-term reliability in demanding environments, from structural frameworks to industrial equipment, minimizing maintenance downtime and improving operational safety.
Specification Summary & Compliance
The screw adheres to precise dimensional standards with a Class 2A thread fit and UNC thread type, ensuring compatibility and ease of use. It meets IFI 111 and SAE J429 specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility for global industrial applications.
