When working with piping, hydraulics, pneumatics or other types of connections, it is important to understand what type of coupling is required for a safe and efficient installation. There are many different types of couplings, each with its own designation, function and application. Choosing the right one clutch can affect the performance, sustainability and safety of the system in question.
The table below describes the different types of couplings and their designations, which can help users to choose the right coupling for a specific application.
| Abbreviation | Translation |
| IR | Internally threaded movable |
| UF | Externally threaded fixed |
| IF | Internally threaded fixed |
| R | Pipe thread (BSP) |
| KR | Tapered pipe thread (BSPT) |
| NPTF | American chronic pipe thread |
| JIC | UNF - thread and 74° sealing surface |
| M | Metric thread |
| SKL | Cutting ring coupling - Pressure class L |
| SKS | Cutting ring coupling - Pressure class S |
| RSL | Pipe spigot - Pressure class L |
| RSS | Pipe spigot - Pressure class S |
| DKO-L | Metric thread 24° cone O-ring Pressure class L |
| DKO-S | Metric thread 24° cone O-ring Pressure class S |