| Standard: |  |
| API Spec7-1 | |
| Description： | |
The size 3-1/2” to 11” drill collar , spiral drill collar & short drill standard
The hear treatment technique is conducted in the range of full length of products..
The thread: processed with cold rolleraccording to the customer’s requirements.
Copyright @ 2016 ORIENT, All Rights Reserved.
ADDRESS: NO.202, Building 6, Area H, Qingyang Industrial Headquarter Base,Chengdu, Sichuan, China
Email：info@orientcn.com TEL：+86-28-65332787 FAX：+86-28-65332789
