We supply slick drill collars, spiral drill collars and non-magnetic drill collars; their sizes are from 3-1/8 to 11 inches. Besides the drill collars in the table below, we can supply other drill collars at customers' request.

 

 

Drill Collar Number*	Outside Diameter, in.	Inside Diameter, in.	Length, ft	Approx Weight, lb/ft	Typical Bending Strength Ratio
NC 23-31	3-1/8	1-1/4	30	22	2.57:1
NC 26-35(2-3/8 IF)	3-1/2	1-1/2	30	27	2.42:1
NC 31-41(2-7/8 IF)	4-1/8	2	30 or 31	34	2.43:1
NC 35-47	4-3/4	2	30 or 31	47	2.58:1
NC38-50 (3-1/2 IF)	5	2-1/4	30 or 31	54	2.38:1
NC 44-60	6	2-1/4	30 or 31	83	2.49:1
NC 44-60	6	2-13/16	30 or 31	76	2.84:1
NC 44-62	6-1/4	2-1/4	30 or 31	91	2.91:1
NC 46-62(4 IF)	6-1/4	2-13/16	30 or 31	84	2.63:1
NC 46-65(4 IF)	6-1/2	2-1/4	30 or 31	100	2.76:1
NC 46-65(4 IF)	6-1/2	2-13/16	30 or 31	93	3.05:1
NC 46-67(4 IF)	6-3/4	2-1/4	30 or 31	109	3.18:1
NC 50-70(4-1/2 IF)	7	2-1/4	30 or 31	118	2.54:1
NC 50-70(4-1/2 IF)	7	2-13/16	30 or 31	111	2.73:1
NC 50-72(4-1/2 IF)	7-1/4	2-13/16	30 or 31	120	3.12:1
NC 56-77	7-3/4	2-13/16	30 or 31	140	2.70:1
NC 56-80	8	2-13/16	30 or 31	151	3.02:1
6-5/8 API Reg	8-1/4	2-13/16	30 or 31	162	2.93:1
NC 61-90	9	2-13/16	30 or 31	196	3.17:1
7-5/8 API Reg	9-1/2	3	30 or 31	217	2.81:1
NC 70-97	9-3/4	3	30 or 31	230	2.57:1
NC 70-100	10	3	30 or 31	243	2.81:1
8-5/8 API Reg	11	3	30 or 31	300	2.84:1

 

*The number connection (NC ) is an API connection with the V- .065 thread form with a V- .038R thread root radius. The firsttwo digits are the pitch diameter of the thread and the last two digits are the outside diameter of the drill collar.