Emkhakheni wokuklama imishini, ukuxhumana nokusekela kuyisihluthulelo sokufinyelela ukuzinza kwesakhiwo kanye nokusebenza. Ama-screw washer (aziwa nangokuthi ama-gasket) ayizixhumi ezivamile. Nakuba emancane, adlala indima ebalulekile ekuhlanganisweni kwemishini. Lesi sihloko sizohlola ukubaluleka kwama-screw washer, sihlaziye imisebenzi yawo, izinhlobo zawo, kanye nokubaluleka kwawo ekusetshenzisweni okungokoqobo.