Nan mekanik, elis la se yon aparèy fòme avèk plizyè pal sitiye regilyèman alantou yon aks. Li se pati yon avyon oswa yon lot machin ki vire toutotouyon aks nan yon likid oubyen yon gaz li pèmèt pouse osinon mentni aparèy la anplas. Li ka sèvi tou pou melanje de likid.
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/0/09/Screw-Konpira.jpg/320px-Screw-Konpira.jpg)
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