S-90409A195 5/8"-18 x 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
- Maximum load-bearing capacity with 150,000 psi tensile strength, ideal for high-stress industrial assemblies
- Superior corrosion resistance and longevity through Grade 8 steel construction and Rockwell C32 hardness
- Secure, vibration-resistant fastening thanks to UNF fine threading and Class 2A thread fit for precise engagement
- Enhanced stability and load distribution from the integrated flange, eliminating the need for separate washers
- Easy installation and high torque application enabled by the external hex drive and 15/16" head width
- Reliable performance in critical environments with compliance to SAE J429, IFI 111, RoHS 3, and REACH standards
- Optimized for partial-thread applications providing strong clamping force where full threading isn't required
Professional Applications & Engineering Value
This Grade 8 steel hex head screw delivers exceptional engineering value in demanding industrial applications where failure isn't an option. The 5/8"-18 UNF fine threading provides superior resistance to vibration loosening compared to coarse threads, while the partially threaded design ensures maximum clamping force in structural connections. The flanged head distributes load pressure over a wider surface area (1 21/64" diameter), preventing surface damage and maintaining joint integrity. With 150,000 psi tensile strength and Rockwell C32 hardness, this fastener withstands extreme mechanical stresses in heavy machinery, construction equipment, and automotive assemblies where reliability is paramount.
Specification Summary & Compliance
This 4" length hex head screw features precise Class 2A thread fit tolerances with 5/8"-18 UNF fine threading and 1 1/2" minimum thread length. Manufactured to IFI 111/SAE J429 specifications for Grade 8 fasteners, it ensures consistent performance across industrial applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global supply chains and environmentally conscious manufacturing operations.
