One of the most important components of the drill string, providing drilling pressure to the bit and increasing the rigidity of the drill string.

Product Description:

AISI 4145H chromium molybdenum steel is used to control the content of trace elements effectively. According

to the shape and material of drill collar, it can be divided into three forms: 1. Type A (cylindrical type) ,

2. Type B (spiral type) , 3. Type C (no magnetic type) .