Lub taub hau txiv ntseej thiab stainless hlau hexagon slotted txiv ntoo yog nruab nrog ib tug sib cais tus pin, uas yog txuam nrog cov ntsia hlau nrog ib lub qhov bolt.Nws yog siv los tiv thaiv kev vibration thiab alternating loads, thiab nws muaj peev xwm tiv thaiv cov txiv ntoo los ntawm loosening thiab tawm.