Eaton 2021-4-4S Steel Flared Tube Connector 1/4 Od Mnpt

Product Description

The EATON 2021-4-4S is a steel flared tube connector designed for high-pressure hydraulic and fluid system applications. It features a 37-degree flare seat on the tube end and a male NPT thread on the opposite end, creating a Flare x MNPT configuration that transitions between flared tubing and standard pipe threads. The connector accepts 0.25-inch tube OD with an inside diameter of 0.170 inches and measures 1.42 inches in overall length. Rated to 9,500 psi maximum working pressure, this fitting is suited for demanding service conditions where a reliable, leak-resistant connection is required. Licensed plumbers, hydraulic technicians, and pipefitters are the primary installers.

This connector is appropriate for hydraulic lines, fuel systems, refrigeration piping, and other pressurized fluid circuits that require a SAE 37-degree flare-to-NPT transition. It performs across a wide temperature range, from -40 degrees F to 250 degrees F, making it viable in both cold-climate and elevated-temperature service environments. Typical installations include industrial machinery, mobile equipment hydraulics, and stationary fluid power systems where NPT-threaded ports must be joined to flared tubing runs.

Key Features

• 37-degree flare seat meets SAE 070102 standard for consistent, leak-resistant sealing
• Maximum working pressure of 9,500 psi suitable for high-pressure hydraulic circuits
• Wide service temperature range: -40 degrees F to 250 degrees F
• Flare x MNPT end configuration for direct transition between flared tubing and NPT pipe threads
• Steel construction provides strength and durability in demanding fluid system environments
• Compact overall length of 1.42 inches aids installation in tight spaces

Compatibility

Designed as an OEM-style replacement or new-installation fitting for hydraulic and fluid power systems requiring a 1/4-inch OD tube flare-to-male NPT connection conforming to SAE 37-degree flare standards.

Installation Notes

Installation should be performed by a qualified hydraulic technician, pipefitter, or licensed plumber. Depressurize and drain the system completely before removing or installing any fittings. Ensure the flare is properly formed to a 37-degree angle using the correct flaring tool before assembly; an improperly formed flare will not seal at rated pressure. Apply thread sealant to the NPT threads in accordance with applicable codes and the fitting manufacturer guidance, and torque connections using calibrated tooling appropriate for the fitting size and system pressure.