The Drill Collar is a thick-walled drilling tool that applies bit pressure to enhance drilling.

Hilong API drill collar specifications include:

• Size (OD): 3-1/8" to 11"
• Type: Slick drill collar, spiral drill collar, non-magnetic drill collar
• Drill collar specification: API Spec 7-1, API Spec 7-2, API RP 7G, NS-1, DS-1
• Other proprietary products of Hilong that applicable to deep well and harsh environment drilling

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