Eaton 105X3 Steel Inverted Nut 3/16 in Od 3/8-24 45 Deg Flare

Product Description

The EATON 105X3 is a steel inverted flare tube nut designed for use in hydraulic, refrigeration, brake, and fuel line assemblies that require a secure, leak-resistant connection. It accepts 3/16 inch tube OD with a 3/8-24 thread and a 45-degree flare seat. The inverted nut design locks onto the flared tube end, creating a metal-to-metal seal rated for up to 2000 psi working pressure and temperatures up to 250 degrees F. This fitting is appropriate for professional installations in HVAC, plumbing, and fluid-transfer systems where SAE and ASME standards compliance is required.

This fitting is suited for residential and light commercial applications involving small-diameter tubing runs. Typical use cases include brake line repairs, fuel system connections, and refrigerant or hydraulic line assemblies where a 3/16 inch tube OD with an inverted 45-degree flare end is specified. It is installed by HVAC technicians, plumbers, and automotive or industrial mechanics working with pre-flared tubing. No specific compatible equipment model numbers are provided in the product data.

Key Features

• Inverted 45-degree flare seat provides a tight metal-to-metal seal under pressure
• Rated for up to 2000 psi maximum working pressure
• Rated for temperatures up to 250 degrees F (121 degrees C)
• 3/8-24 thread size fits standard inverted flare fittings for 3/16 inch OD tubing
• Meets ASA, ASME, MS, and SAE 040110 standards
• Steel construction for durability in fluid-transfer and hydraulic service

Compatibility

Designed as an OEM-style replacement inverted flare nut for systems using 3/16 inch OD tubing with a 45-degree flare end and 3/8-24 thread specification.

Installation Notes

Installation should be performed by a qualified technician familiar with flared tube fittings and applicable codes such as SAE or ASME standards for fluid systems. Always depressurize and purge the line before removing or installing any tube fitting. Hand-start the nut onto the mating fitting before applying a wrench to avoid cross-threading. Inspect the flare seat and tube flare for damage before assembly, as a deformed seat will compromise the seal.