Eaton 1290-6S Steel Flared Tube Nut 3/8 in Od 37 Deg

Product Description

The EATON 1290-6S is a 3-piece steel flared tube nut designed for use in hydraulic and fluid-transfer tubing assemblies. It connects to 3/8-inch OD tubing using a 9/16-18 SAE thread and seats against a 37-degree flare to form a leak-resistant mechanical joint. The nut follows SAE 070110 standards, making it a specification-grade component suitable for pressurized line connections. At 0.72 inches in overall length and 0.04 pounds, it is a compact fitting appropriate for tight routing in equipment and system plumbing. Licensed tradespeople and experienced technicians working with hydraulic, HVAC, or refrigeration tubing lines will find this a direct-fit SAE flare hardware component.

The 1290-6S is suited for use in residential and commercial fluid-transfer systems where SAE 37-degree flare connections are specified. Typical applications include hydraulic control lines, refrigeration tubing joints, and compressed-air or fuel-line assemblies that require a threaded tube nut to secure a flared tube end against a mating fitting body. It is sold as a single unit, making it practical for service calls requiring a one-for-one replacement of a damaged or corroded tube nut in an existing assembly.

Key Features

• 3/8-inch tube OD fitment for standard SAE flare tubing
• 9/16-18 SAE thread for positive engagement with mating fittings
• 37-degree flare angle per SAE 070110 standard
• Steel construction for durability in pressurized line applications
• 3-piece design; compact overall length of 0.72 inches
• Lightweight at 0.04 pounds, suitable for space-constrained installations

Compatibility

Designed as an OEM-style replacement tube nut for SAE 37-degree flare fittings with 3/8-inch OD tubing and 9/16-18 thread engagement in hydraulic, refrigeration, and fluid-transfer line assemblies.

Installation Notes

Installation should be performed by a licensed technician familiar with SAE flare fitting procedures. Depressurize and isolate the line completely before disassembling any tube connection. Ensure the tube end is properly flared to 37 degrees and free of burrs or deformation before seating the nut. Hand-tighten first to confirm thread engagement, then bring to final torque using a properly sized open-end wrench — consult the applicable system service manual for torque requirements.