Terms & Definitions
Terms & Definitions
Metric Fittings vs. Metric Threads:
The terminology used to describe the majority of foreign threaded fittings can be confusing to some.
Metric fitting is a term describing a number of foreign threads including BSP, JIS, Kobelco, Komatsu, and Metric, even though some of these have imperial dimensions. Metric threads, however, refers to a specific type of foreign thread and is part of the Metric fitting category.
![Hose/Tube Side vs. Port Side fittings, hose site, tube side, port side](https://www.hydraulicsdirect.com/v/vspfiles/assets/images/hose-tube-side-vs-port-side.jpg)
![Thread Form vs. Thread Pitch identifying fittings, thread form, thread pitch, flanks, thread crests](https://www.hydraulicsdirect.com/v/vspfiles/assets/images/thread-form-vs-thread-pitch.jpg)
When identifying fittings, another important factor to look at is thread form and thread pitch.
Thread form refers to the angle (in degrees) that exists between adjacent flanks of a thread. Thread pitch however, refers to the distance measured between adjacent thread crests.