S-90409A196 5/8"-18 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 capability with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior wear resistance due to Rockwell C32 hardness, ensuring extended service life in demanding environments
- Enhanced stability and vibration resistance from the integrated flange design that distributes load evenly
- Precise thread engagement with Class 2A fit and UNF fine threads for secure fastening in critical assemblies
- Easy installation and removal using standard 15/16" external hex drive tools for efficient maintenance
- Reduced material stress concentration through partial threading design that optimizes strength-to-weight ratio
- Compliance with international standards including SAE J429 and environmental regulations for global project compatibility
Professional Applications & Engineering Value
This Grade 8 steel hex head screw with 5/8"-18 UNF fine threading delivers critical engineering solutions for heavy machinery, structural frameworks, and industrial equipment. The flanged design eliminates the need for separate washers while providing superior clamping force distribution, preventing surface damage and maintaining joint integrity under dynamic loads. The partially threaded shank concentrates strength where needed most, reducing stress risers in high-vibration environments. With Rockwell C32 hardness and 150,000 psi tensile strength, it withstands extreme mechanical stresses in construction, automotive, and manufacturing applications where fastener failure is not an option. The external hex drive ensures compatibility with standard industrial tools for streamlined assembly processes.
Specification Summary & Compliance
Manufactured to IFI 111/SAE J429 specifications with Class 2A thread fit precision and UNF fine thread spacing. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features include 4 1/2" length, 1 21/64" flange diameter, right-hand thread direction, and meets all mechanical properties for Grade 8 high-strength fasteners.
