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-box adapter (one end is male thread/pin thread and the other end is female thread/box thread) is a critical component in DTH (Down-the-Hole) drilling systems, designed to bridge connections between mismatched or incompatible threaded tools, pipes, or hammers.

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”).

When Would You Need a Pin-Box Adapter?

1.Your DTH hammer’s thread type/size doesn’t match the drill pipe.

2.You’re integrating equipment from different thread type and size.

3.You need to extend the drill string with non-standard components.