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

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”).