Screwed Fitting: Connection parts that have a fitting such as an external thread, an internal thread, or an external/internal thread. a stainless steel screwed fitting, designed to connect individual piping components and elements into a single system. Thanks to this, these parts are mounted quite quickly and conveniently without additional effort and cost. At your choice, you can purchase a screwed fitting made of AISI 304, 304L, 316 and 316L stainless steel.