S-90389A227 1 1/4"-7 Flange Nuts

Key Features & Benefits at a Glance

• **Enhanced load distribution** with a 2 1/4" flange diameter, reducing surface pressure and preventing damage to assembled materials.
• **Superior corrosion resistance** in harsh environments, thanks to 316 Stainless Steel construction, ideal for marine, chemical, and outdoor applications.
• **Secure and reliable fastening** with a Class 2B thread fit, ensuring consistent engagement and vibration resistance in heavy-duty assemblies.
• **Quick and easy installation** using standard wrenches on the 1 13/16" external hex drive, saving time on the production line.
• **Robust structural integrity** from a 1 1/4" height and 0.25" flange thickness, providing high tensile strength for demanding mechanical loads.
• **Wide compatibility** with 1 1/4"-7 UNC coarse threads, facilitating use in common industrial equipment and structural frameworks.
• **Compliance with global standards** including RoHS 3 and REACH, ensuring safety and environmental responsibility for international supply chains.

Professional Applications & Engineering Value

This **heavy-duty flange nut** is engineered to address common industrial challenges such as joint loosening under vibration and corrosion-induced failure. The **316 Stainless Steel** material offers exceptional resistance to chlorides and acidic conditions, making it a top choice for **marine hardware, chemical processing equipment, and food machinery**. The integrated **flange design** eliminates the need for a separate washer, distributing clamp load evenly to prevent surface indentation and maintain structural integrity in **high-stress assemblies**. Combined with **UNC coarse threads** and a **Class 2B thread fit**, it ensures rapid installation and reliable performance in **construction, transportation, and heavy machinery** applications, reducing maintenance downtime and lifecycle costs.

Specification Summary & Compliance

This flange nut adheres to **UNC thread standards** with a **Class 2B thread fit** for consistent accuracy and interchangeability. Key dimensions include a **2 1/4" flange diameter**, **1 1/4" height**, and **1 13/16" width** across flats, manufactured to precise industrial tolerances. It is fully compliant with **RoHS 3 (2015/863/EU)** and **REACH (EC 1907/2006)**, meeting stringent environmental and safety regulations for hazardous substances.