API Drilling Tool Drill Collar 7 5/8 REG 241.3
USD $315 - $786 /Unit
Min.Order:1 Unit
Guanghan Hongcheng Petroleum Tools Co., Ltd.
The drill collars are made of from 4145H modified chromium-molybdenum alloy steel acc. to API Spec. 7 and SY/T5144. All threads can be phosphate, copperised or cold worked. All threads are machined with CNC Lathes-Double-shouldered and special thread, and the max diameter of drill collar is 14 inch.
1. High-strength
2. API Standard
3. Excellent Cost Performance