Yon vis se yon machin senp ki kapab transfòme yon mouvman wotasyon nan yon mouvman translasyon ki dirije sou aks wotasyon an, oswa vise vèsa. Li gen ladan yon plan enkline ki vlope nan yon espiral ozalantou yon poto silendrik.
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7b/Cross_slot_screw.jpg/640px-Cross_slot_screw.jpg)
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