castle e nut开花螺母;城堡螺母
castle circular nut六角圆顶螺母;六角圆螺母
hexagon castle nut六角冠状螺母;六角槽顶螺母
hezagon castle nut开槽六角螺母
fulcrum pin castle nut支销槽顶螺母
castellated nut castle nut槽形螺母
hexagon thin castle nut六角冠状薄螺母
heagon low castle nut六角蝶形螺母
light castle nut轻型堡形螺帽
N（名词） a hexagonal nut with six slots in the head, two of which take a locking pin to hold it firmly in position 槽顶螺母