HILONG

Drill Collar

A drill collar is a thick-walled drilling tool used to apply controlled weight on the bit, helping maintain stability, control deviation, and reduce vibration during drilling. Positioned above the drill bit, it plays a key role in supporting smooth, efficient drilling and wellbore integrity.
HILONG

Drill Collar

A drill collar is a thick-walled drilling tool used to apply controlled weight on the bit, helping maintain stability, control deviation, and reduce vibration during drilling. Positioned above the drill bit, it plays a key role in supporting smooth, efficient drilling and wellbore integrity.

Drill Collars
PRODUCT SPECIFICATION
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Dimensions Connection
Size (in) OD (in) ID (in) Connection Type PDF Spec Sheet
4.75 4 3/4 2 NC38
4.75 4 3/4 2 1/4 NC38
4.75 4 3/4 2 NC35
6.25 6 1/4 2 1/4 NC46
6.25 6 1/4 2 13/16 NC46
6.5 6 1/2 2 1/4 NC46
6.5 6 1/2 2 1/4 NC50
6.5 6 1/2 2 13/16 NC46
6.5 6 1/2 2 13/16 NC50
6.75 6 3/4 2 1/4 NC46
6.75 6 3/4 2 1/4 NC50
6.75 6 3/4 2 13/16 NC50
8 8 2 13/16 6-5/8REG
8 8 2 13/16 NC61
Additional Information
Hilong drill collars are built to deliver steady, reliable performance in challenging drilling environments. Engineered to reduce sticking and support efficient drilling, they are well suited for deep wells and demanding conditions. Manufactured using high-quality materials and precise processes, these collars provide dependable strength, long-term durability, and consistent performance across a wide range of drilling applications.
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Drilling tools PDF

Please refer to Table A.4 or Table B.4 in our DRILLING TOOLS BROCHURE for the specifications of commonly-used API Drill Collars.
Download the Full Drilling Tools Brochure