S-90409A120 1/4"-20 x 3" 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 and durability with Grade 8 classification and 150,000 psi tensile strength, ideal for high-stress industrial applications.
- Enhanced load distribution thanks to the integrated 9/16" flange, reducing the need for separate washers and preventing surface damage.
- Reliable fastening performance with Rockwell C32 hardness, ensuring resistance to wear and deformation under heavy loads.
- Easy installation and removal using standard 3/8" external hex drive, compatible with common wrenches for efficient assembly.
- Secure thread engagement with Class 2A UNC coarse threads, providing consistent clamping force and vibration resistance.
- Optimized for partial threading allowing unthreaded shank sections to bear shear loads effectively in structural connections.
- Compliance with industry standards including SAE J429 and IFI 111, ensuring consistent quality and interchangeability.
Professional Applications & Engineering Value
This Grade 8 steel hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where high tensile strength and vibration resistance are paramount. The flanged design eliminates washer requirements, speeding up installation while distributing clamp load over a wider area to prevent joint loosening. With UNC coarse threading and Class 2A thread fit, it ensures rapid assembly and reliable performance in dynamic environments. The partially threaded shank provides superior shear strength, making it ideal for bolted connections subjected to lateral forces. Manufactured from hardened steel and compliant with SAE J429, this screw delivers consistent performance in demanding industrial applications.
Specification Summary & Compliance
This fastener features a 1/4"-20 UNC thread with Class 2A fit and coarse spacing for reliable engagement. It meets IFI 111 / SAE J429 specifications for dimensional accuracy and mechanical properties. The screw is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to environmental and safety regulations for industrial use.
