🔍 Key Concepts

• Flared vs. flareless hydraulic fittings – what visible feature shows the tube end has been flared? • How high‑pressure fittings support the tube and seal: metal‑to‑metal seat, backup sleeve, and how much of the tube is gripped. • Differences in the drawings between compression-type fittings (using a ferrule) and inverted/standard flare fittings.

💭 Think About

• In each figure (A, B, C, D), look closely at the end of the tube: which ones show the tube wall formed into a cone or flare that seats against a matching cone in the fitting body? • Which figure shows the tube being gripped and supported over the largest area with a solid metal backing behind the flare, making it suitable for higher pressures? • Compare the figure that looks like an automotive brake‑line style inverted flare (commonly used for higher pressures) with one that looks like a simple standard flare or compression fitting.

✅ Before You Answer

• Before choosing, be sure you can point to the actual flared tube end in the cross‑section and the matching conical seat in the fitting body. • Confirm that the fitting you select has positive metal‑to‑metal support behind the flare, not just a single small ferrule biting into the tube. • Eliminate any figure where the seal is made mainly by a single compression ring/ferrule rather than a formed flare on the tube itself.