In Down-the-Hole (DTH) drilling, an adapter (also called a drill pipe adapter or bit adapter) is a crucial component that connects the DTH hammer to the drill string (drill pipes or rods).

A pin-pin adapter (both ends male-threaded) is a specialized connector in DTH (Down-the-Hole) drilling used to join two female-threaded (box) components when a direct connection isn't possible.

Popular thread types:

API REG(Regular)  

API IF((Internal Flush)

API FH(Full Hole）

Popular thread szies: (2 3/8”, 2 7/8”, 3 1/2”, 4 1/2”, 5 1/2”, 6 5/8”, 7 5/8”).