Seling sukurori, kuma aka sani da kai-sealing screws ko sealing fasteners, su ne na musamman dunƙule sassa tsara don samar da amintacce kuma yabo-hujja hatimi a daban-daban masana'antu da na inji aikace-aikace. Waɗannan sukurori suna da ƙira na musamman wanda ya haɗa da abin rufewa, yawanci O-ring ko wanki mai juriya, wanda aka haɗa cikin tsarin dunƙule. Lokacin da dunƙule hatimin aka ɗaure cikin wurin, abin rufewa yana haifar da hatimi mai tsauri tsakanin dunƙule da saman mating, yana hana wucewar ruwa, gas, ko gurɓatawa.