Refrigeration Brass Flare Union – Internal to External Adapter,45° SAE flare, SAE J513 compliant. Connects internal flare to external flare ports without additional adapters. Forged brass, resists vibration and pullout. Sizes 1/4″ to 7/8″. Working pressure 700 psig.
Our Internal Flare to External Flare Union is a precision-machined brass fitting designed to connect an internal flare port to an external flare port in air conditioning, refrigeration, and heat pump systems. It provides a reliable, leak-proof transition where two different flare connection types must be joined — a common requirement when adapting service valves, compressors, and system components with mismatched flare ports.
Manufactured from forged brass, the union offers high mechanical strength, vibration resistance, and a pore-free structure that prevents refrigerant seepage. The 45° SAE flare seats on both ends create a metal-to-metal seal that can be assembled and disassembled repeatedly without damage, making it ideal for service access and field repairs. In conformance with SAE J513 and military standards MS-35867 through MS-35873, this fitting is engineered for long-term reliability in critical HVACR connections.
| Parameter | Details |
|---|---|
| Material | Forged Brass |
| Standard | SAE J512 / SAE J513 |
| Type | Internal Flare x External Flare Union (Straight) |
| Connection | 45° SAE Internal Flare x 45° SAE External Flare |
| Size Range | 1/4″ – 7/8″ (6.35mm – 22.23mm) |
| Working Pressure | Up to 700 psig |
| Operating Temperature | -65°F to +250°F (-54°C to +121°C) |
| Thread Type | UNF (SAE) |
| Surface | Smooth, lead-free options available |
Single-Fitting Transition – Connects an internal flare port directly to an external flare port, eliminating the need for multiple adapters in the refrigerant circuit
Forged Brass Construction – Eliminates porosity and seepage risk found in cast fittings, ensuring a leak-proof seal under high pressure and vibration
Vibration Resistant – Forged structure resists mechanical pullout and withstands vibration in compressor lines better than machined or cast fittings
45° SAE Flare Seats – Precision-machined flare seats create a reliable metal-to-metal seal that can be assembled and disassembled repeatedly without damage
Smooth Interior Finish – Provides unrestricted flow and reduced pressure drop across the fitting
Full Size Range – 1/4″ to 7/8″ to match common ACR copper tube sizes, including reducing combinations
SAE J513 Compliant – Meets functional requirements of SAE J512 and J513 for refrigeration fittings
Connecting internal flare ports to external flare ports in refrigerant lines
Adapting mismatched flare connections on compressors, service valves, and filter driers
Split AC and refrigeration system piping where flare type transition is required
Field repairs and service connections in HVACR equipment
Propane, fuel, and natural gas lines
Connection – Internal flare x external flare, custom combinations available
Size – 1/4″ to 7/8″, reducing and equal configurations available
Material – Standard forged brass; lead-free brass on request
Surface – Natural, nickel-plated, or custom finish
OEM/ODM – Custom dimensions and thread specifications accepted per customer drawing
Packaging – Bulk carton, individual bag, or custom labeled packaging
Lead Time – 7–25 days for standard sizes
MOQ – Flexible, contact us for details
Samples – Available upon request
For technical datasheets, samples, or bulk pricing, contact us directly.
