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2. Gender of connectors and fasteners - Wikipedia

   en.wikipedia.org/wiki/Gender_of_connectors_and...

   Schematic symbols for male and female connector pins. In electrical and mechanical trades and manufacturing, each half of a pair of mating connectors or fasteners is conventionally assigned the designation male or female. [1] The female connector is generally a receptacle that receives and holds the male connector.

3. Coupling (piping) - Wikipedia

   en.wikipedia.org/wiki/Coupling_(piping)

   Alternatively it is a short length of pipe with two female National pipe threads (NPT) (in North American terms, a coupler is a double female while a nipple is double male) or two male or female British standard pipe threads. If the two ends of a coupling are of different standards or joining methods, the coupling is called an adapter. Examples ...

4. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   Pressend / Male Thread Pressend / Female Thread Valve Connection Flange End-Connector Elbow 90°, F/F & F/M Elbow 45°, F/F & F/M Bend 15°, 45°, 75° M/M Coupling Coupling Long Tee Elbow 90° Male Coupling Bend 90° Male Thread Tee Male Union Male Coupling Male Straight Connector Elbow 90° Female Coupling

5. Air-line fitting - Wikipedia

   en.wikipedia.org/wiki/Air-line_fitting

   Pneumatic tool attached using a coupling. A coupled pair consists of a male nipple or plug and a female coupler or socket. One side is connected to a flexible supply hose; the other may be attached to a manifold, valve, tool, or another hose. A female coupler is used on the supply side, and a male nipple is used on the receiving side.

6. Mating connection - Wikipedia

   en.wikipedia.org/wiki/Mating_connection

   In such connections one of the two components acts as male and the other as female, although more complex relationships exist. [1] Any electrical connector, bolted joint, and jigsaw puzzle is an example of assembling based on mating connection.

7. Nipple (plumbing) - Wikipedia

   en.wikipedia.org/wiki/Nipple_(plumbing)

   A chase nipple has male threads on one end only. The other end is a hexagon. The chase nipple passes through the knockouts of two boxes, and is secured by an internally threaded ring called a lock nut. [1] [2] Chase-Shawmut Company, of Boston, is the company which first produced chase nipples. [3]