Eaton 1290-12S Steel Flared Tube Nut 3/4 in Od Sae

Product Description

The EATON 1290-12S is a 3-piece steel flared tube nut designed for use in hydraulic and fluid-power line assemblies requiring a secure, leak-resistant connection. It accepts 3/4 inch tube outside diameter and features a 1-1/16-12 SAE thread with a 37-degree flare angle. Rated to 3000 psi maximum working pressure, this fitting nut is built to SAE 070110 standards. The 3-piece construction allows the nut to be installed over tubing before flaring, then threaded onto a mating male flare fitting to complete the connection. Overall length is 1.02 inches. Installers in hydraulic, refrigeration, and fluid-transfer applications rely on this type of fitting for reliable, vibration-tolerant connections.

The 1290-12S is suited for use in hydraulic systems, fluid-power circuits, and high-pressure tubing assemblies where SAE 37-degree flare fittings are specified. Typical install scenarios include mobile hydraulic equipment, industrial machinery plumbing, and commercial fluid-transfer lines. The 3/4 inch tube OD and 1-1/16-12 thread size make it a standard choice when routing steel tubing through systems that require rated working pressures up to 3000 psi.

Key Features

• 3/4 inch tube outside diameter for compatibility with standard SAE flare tubing
• 1-1/16-12 SAE thread for secure mating with male flare fittings
• 37-degree flare angle per SAE 070110 standard
• 3000 psi maximum working pressure rating
• 3-piece design allows pre-installation over tubing before flaring
• Steel construction for durability in high-pressure hydraulic environments

Compatibility

Designed as an OEM-style replacement or service fitting for hydraulic and fluid-power tube assemblies requiring SAE 37-degree flare connections with 3/4 inch tube OD and 1-1/16-12 thread specification.

Installation Notes

Installation is typically performed by hydraulic technicians or plumbers working on fluid-power systems. Always depressurize and isolate the hydraulic circuit before disassembling or replacing fittings. Ensure the tube end is properly flared to the correct 37-degree angle before tightening the nut onto the mating fitting. Inspect threads and flare seat for damage before assembly to avoid leaks under pressure.