HOISTING PLUG
The hoisting plug is the connecting link between hoisting line and drill pipe. It is also used with a casing plug or adaptor to run or pull casing. It consists of a bail, roller bearing and a tool joint thread like that used on the bottom of a kelly. The hoisting plug should be kept clean and the bearing and coupling threads oiled to ensure smooth spinning.
It is important that the vent hole does not become blocked as this will draw the fluid from the hole as the drill string is raised.
