S-90409A189 5/8"-18 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 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 under demanding conditions
- Secure fastening with fine UNF threading providing enhanced vibration resistance and precise thread engagement
- Integrated flange design eliminates the need for separate washers, simplifying installation and distributing load effectively
- Class 2A thread fit ensures consistent, reliable assembly with standard nuts and threaded components
- Heavy-duty Grade 8 steel construction delivers maximum reliability for critical industrial applications
- External hex drive compatibility allows for high-torque installation using standard tools
Professional Applications & Engineering Value
This Grade 8 steel hex head screw with 5/8"-18 UNF fine threading is engineered to solve critical fastening challenges in heavy machinery, structural assemblies, and high-vibration environments. The flanged design provides superior load distribution while eliminating separate washers, reducing assembly time and potential failure points. The Rockwell C32 hardness and 150,000 psi tensile strength ensure reliable performance under extreme mechanical stress, making it ideal for construction equipment, automotive systems, and industrial machinery where fastener failure is not an option. The external hex drive accommodates high-torque applications while the fine UNF threads maintain secure connections in vibrating systems.
Specification Summary & Compliance
This heavy-duty hex head screw features precise Class 2A thread fit with 5/8"-18 UNF fine threading and 2 1/2" length. Manufactured to meet SAE J429 specifications for Grade 8 fasteners, it ensures dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety standards for industrial applications worldwide.
