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API Drill Collar Spiral Drill Collar and Nmdc

2025-04-13 5060
Technical/Sample/Quality
1 Year
Forging
Polishing
Atmospheric Pressure
Alloy
4145h
Thread Protectors
Ns1 and Ds1 Properties
According to API Spec 7-1
Pony Drill Collar Available
Stress Reflief Groove
SHUNFU
Standard
3 1/8" - 11"
China
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