Drill collar

---Drill collar
Usage :
One of the most important components of the drill string is to provide drilling bit of pressure and the drill string rigid role .
Standard :
API 7, API 7-1 and SY/T standards.  
Material :
AISI 4145 H or Non-magnetic material.
Types:
Slick drill collars
Spiral drill collars
Non-mag material drill collars
Size :
OD : 3 1/8"---11", Length : 10'---31'
Mechanical Property :
Mechanical Property of Slick and Spiral drill collars made of AISI 4145 H

Place of Origin:	Xi'an Shannxi China
Model No:	Slick drill collars