S-90409A161 1/2"-20 x 1 1/4" 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
- Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance and durability through Grade 8 steel construction and Rockwell C32 hardness
- Precise thread engagement with Class 2A fit UNF fine threading ensuring vibration resistance and secure fastening
- Integrated flange design eliminates need for separate washers, reducing assembly time and part count
- Heavy-duty external hex drive provides superior torque transmission and prevents tool slippage during installation
- Full threading along 1¼" length offers maximum adjustment flexibility and grip strength
- Comprehensive regulatory compliance with SAE J429, RoHS 3, and REACH standards for global industrial acceptance
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and high-vibration environments. The 1/2"-20 UNF fine threading with Class 2A fit maintains clamping force under dynamic loads, while the integrated flange distributes pressure evenly to prevent surface damage. Manufactured from high-strength steel with Rockwell C32 hardness, it withstands extreme tension and shear forces in construction equipment, automotive frames, and industrial manufacturing. The external hex drive ensures reliable installation with standard tools, making it ideal for maintenance-critical applications where fastener integrity is paramount.
Specification Summary & Compliance
This heavy-duty fastener features precision 1/2"-20 UNF fine threading with Class 2A tolerance for consistent fit and performance. Manufacturing complies with IFI 111 specifications meeting SAE J429 standards for Grade 8 requirements. The screw maintains full regulatory compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental directives, ensuring safe use across global industrial markets while delivering reliable 150,000 psi tensile strength in demanding applications.
