The tap used to cut threads in a blind hole is bottoming Tap
Electrode is consumed in arc welding process.
A drift is used for removing the drill from the machine spindle.
stack:The portion of the blast furnace above its widest cross-section is called stack.
Bosh:The portion of the blast furnace below its widest cross-section is called bosh.
Throat: The charge is fed into the blast furnace through the throat.
Hearth: The hearth is the lowest, but the most important part of the blast furnace.