Bushings, oo sidoo kale loo yaqaano biraha cad ama gacmaha gacmaha, waa qaybo cylindrical ah oo loogu talagalay in lagu yareeyo khilaafka u dhexeeya labada qaybood ee dhaqdhaqaaqa.Caadi ahaan waxay ka samaysan yihiin alaabta sida naxaasta, naxaasta, birta, ama balaastikada.Buushka waxaa la geliya guri ama daas si ay u taageeraan oo u hagaan ulaha wareega, ulo, ama qaybaha kale ee farsamada.