全牙螺杆
threaded rod
外六角扳手
outer hex/hexagon/hexagonal wrench/spanner;
内六角扳手
inner hex/hexagon/hexagonal wrench/spanner;
内六角螺杆
inner hex/hexagon/hexagonal screw/bolt;
垫片
filling piece; gasket;
外六角内十字螺杆
outer hex/hexagon/hexagonal and inner crossing screw/bolt