The HVACR industry typically uses what flare angle for copper tubing?

• A. 60 degree flare
• B. 45 degree flare angle
• C. 90 degree elbow
• D. 30 degree bevel

Answer: (B)

The thing being tested is the standard flare angle used on copper refrigerant tubes. In HVACR, copper tube flares are made with a 45-degree angle. That 45-degree flare creates a precise cone-shaped sealing surface that mates with the corresponding flare on the fitting when the flare nut is tightened, giving a reliable, leak-proof seal under system pressure. The other options don’t match the common sealing geometry used for refrigerant lines: a 60-degree flare isn’t the standard for HVACR copper tubes, and a 90-degree elbow or a 30-degree bevel describes different components or tooling rather than the tube end flare itself. Using the correct 45-degree flare ensures compatibility with standard fittings and proper sealing.