Drill Collars

 

Our company’s drill collars are manufactured from 4145H Modified quenched and tempered steel. After the full length special heat-treatment, a hardness range of 285 to 341 BHN are guaranteed one inch below the surface at room temperature.

 

Connections are cold-rolled, phosphatized, coated and equipped with thread protectors. These are gauged to API standards.

 

Size: OD 31/2”~11”, length: 10ft~31ft

 

　

 

Mechanical Property:

 

 

 

When ordering or requesting quotations on drill collars, please specify:      

 

1. Drill collar OD

2. Drill collar ID

3. Overall length

4. Connections required (size and type)

5. Special features desired, for example:

    Stress Relief Features

    Slip and/or Elevator Recess