3/8-Inch Brass Flare Nut, 5-Pack for Air Conditioning Copper Tubing

Key features

• FOR AC AND REFRIGERATION COPPER LINES: These brass flare nuts connect properly flared 3/8-inch OD copper tubing to compatible air-conditioning service or shutoff valves. Suitable for HVAC repairs and matching refrigeration copper-line connections.
• VERIFY THE 5/8-18 UNF CONNECTION: The 3/8-inch variation identifies the outside diameter of the copper tube rather than the internal thread size. Each female nut has a 5/8-18 UNF thread and a 9.8 mm tube opening, allowing the tube and valve dimensions to be checked separately.
• 45-DEGREE FLARE STRUCTURE IN HPb59-1 BRASS: The shaped internal seat holds the prepared copper-tube flare against the corresponding valve cone. A 22 mm hex width provides a defined wrench surface, while the overall nut length is approximately 17 mm.
• ASSEMBLES WITH A PROPERLY FLARED TUBE: Place the nut over the copper tubing before using the flaring tool, form the correct 45-degree flare, align the tube end with the service-valve seat, and tighten with an appropriate wrench. Tubing, valve, and tools are sold separately.
• 5-PIECE SAME-SIZE SET: Each package contains 5 matching 3/8-inch brass flare nuts for HVAC and refrigeration maintenance. Confirm the tube OD, 5/8-18 UNF thread, and flare-seat type before purchasing; not specified for use as a gas-line cap, compression nut, pipe plug, or hydraulic fitting.

APPLICATION: These 3/8-inch brass flare nuts are used with properly flared copper tubing and compatible HVAC or refrigeration service and shutoff valves. SIZE: Fits 3/8-inch OD (9.52 mm) copper tubing. Female thread: 5/8-18 UNF. Tube opening: 9.8 mm. Hex width: 22 mm. Overall length: 17 mm. CONSTRUCTION AND INSTALLATION: Made of HPb59-1 brass with a 45-degree flare seat. The 3/8-inch size describes the copper tube OD, while 5/8-18 UNF describes the matching valve connection thread. Install the nut on the tube before forming the flare. PACKAGE AND USE BOUNDARY: Includes 5 same-size brass flare nuts. Copper tubing, service valve, and installation tools are not included. Designed for matching air-conditioning and refrigeration connections, not for closing or capping a pipe.

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