S-90409A171 1/2"-20 x 4 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 load-bearing capacity with 150,000 psi tensile strength for demanding industrial applications
- Superior corrosion resistance and durability through Grade 8 steel construction and Rockwell C32 hardness
- Secure fastening with precise thread engagement thanks to Class 2A thread fit and 1/2"-20 UNF fine threading
- Enhanced stability and distribution of clamping force with integrated flange design
- Reliable installation and removal using standard external hex drive and 3/4" head width
- Optimized for partial thread applications where unthreaded shank provides additional shear strength
- Compliance with international environmental standards including RoHS 3 and REACH for global supply chain compatibility
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical performance in heavy machinery, structural steel connections, and industrial equipment where vibration resistance and high tensile strength are paramount. The partially threaded design ensures maximum grip length while the flange eliminates the need for separate washers, reducing assembly time and potential failure points. Manufactured from steel with Rockwell C32 hardness, it withstands extreme mechanical stress and environmental exposure. The 1/2"-20 UNF fine thread provides superior resistance to loosening under dynamic loads, making it ideal for automotive, construction, and manufacturing applications where reliability cannot be compromised.
Specification Summary & Compliance
This fastener maintains Class 2A thread fit tolerance for consistent engagement and meets IFI 111/SAE J429 specifications for dimensional accuracy and mechanical properties. The 4 1/2" length with 1 1/4" minimum thread length ensures proper installation across various material thicknesses. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental responsibility while maintaining the 150,000 psi tensile strength required for critical industrial fastening applications.
