Types of hydraulic fittings vary depending on their sizes, configuration, and thread types. The three most common types of hose fittings are O-ring, mated angle and threaded.BSPT (JIS-PT) – commonly known as the British Thread Type, these are standard fittings which have been internationally adopted for sealing pipe ends and making connections.
The three most common fitting ends and connector types for hydraulic fittings are the O-ring, the mated angle, and the tapered thread connectors. Although these are the most popular choices, several other types are used in different and specialised applications.