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kontraanya
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Description
A locking nut lecsavarodás ellen védett anya, és nem kontraanya. A kontraanya egy bármilyen kinézetű második anya, amit összeszorítanak az "elsődleges" anyával. Így akadályozzák meg annak lecsavarodását, vagy elmozdulását. A kontra anya tehát a magyarban elsősorban funkciót jelöl, nem típust. Az ilyen funkciót betöltő anyákat angolul jam nut-nak nevezik:
A jam nut is a low profile type of nut, typically half as tall as a standard nut. It is commonly used as a type of locknut, where it is "jammed" up against a standard nut to lock the two in place. It is also used in situations where a standard nut would not fit.
The term "jam nut" can also refer to any nut that is used in the same function (even a standard nut used for the jamming purpose). Jam nuts, other types of locknuts, lock washers, and thread-locking fluid are ways to prevent vibration from loosening a bolted joint.