S-90409A157 1/2"-13 x 3 3/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in high-stress industrial applications.
• Enhanced Durability & Wear Resistance: Rockwell C32 hardness provides superior resistance to deformation and extends service life under repetitive loading.
• Secure Flange Design: Integrated flange eliminates the need for separate washers, distributing clamp load evenly and preventing loosening from vibration.
• Optimized Thread Engagement: 1/2"-13 UNC coarse threads and Class 2A fit enable faster installation and superior grip in a wide range of materials.
• Robust Material Construction: High-strength steel composition delivers exceptional shear strength and corrosion resistance for demanding environments.
• Industry-Standard Compliance: Meets SAE J429 and IFI 111 specifications, ensuring interchangeability and reliability in mechanical assemblies.
• Environmental Responsibility: RoHS 3 and REACH compliance guarantees safe use in regulated industries without hazardous substances.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for critical applications where high tensile strength and vibration resistance are paramount. The flanged design provides built-in load distribution, eliminating washer requirements while maintaining clamp force in heavy machinery, structural steel connections, and automotive assemblies. The 1/2"-13 UNC coarse thread with Class 2A fit ensures rapid installation and reliable performance in both metallic and composite materials. Partial threading allows for precise unthreaded shank engagement in shear-critical joints, while the external hex drive accommodates high-torque applications. Ideal for construction equipment, industrial presses, and transportation infrastructure where SAE J429 compliance and 150,000 psi tensile strength are mandatory for safety and durability.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit per UNC standards with precise 1/2"-13 coarse threading and 3 3/4" length. Manufacturing adheres to IFI 111 specifications SAE J429, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety.