nelja, üldjuhul üksteisest sõltumatult liikuvat osa (pakki) sisaldav padrun ümmaguste erineva ristlõikega toorikute kinnitamiseks tööpinki (vrd kolmepakiline padrun)
a chuck used in a lathe or in certain other types of machine tools, comprising four jaws disposed at right angles to each other and acting usually independetly of each other (compare: three-jaw chuck)
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Used for holding rectangular or irregularly contoured workpieces, or for revolving circular workpieces eccentrically.
