API Standard Drill Collar for Water/Oil Well Drilling

• Customized: Customized
• Standard: API
• Length: Customized
• Model NO.: API drill collar
• Type: Well Drilling
• Material: High Speed Steel
• Usage: Well Drilling
• Colar: Black, Blue
• Transport Package: Shipment
• Specification: 152 165 203mm
• Trademark: Feilong Retop
• Origin: China
• HS Code: 82071910
• Production Capacity: 10000PCS

Product Description

Product Description
Drill Collar is mainly used for providing drill bit with required drilling pressure, ensuring pull force transmitted to drill pipe and centralize the drill bit. According to API Spec 7-1 specifications, the material quality is 4145H that's after heat-treatment, thread hardening treatment and phosphating to better antiseize. It also can be produced upon customers' requirements.
 

Drill Collar Thread	Outside Diameter D		Inside Diameter d		Length	Chamfer Diameter	Reference Bending Strength Ratio
					L	Df
	mm	in	mm	in	mm	mm
NC31-41(27/8IF)	104.8	4 1/8	50.8	2	9140or9450	100.4	2.43:1
NC35-47	120.7	4 3/4	50.8	2	9140or9450	114.7	2.58:1
NC38-50(31/2IF)	127	5	57.2	2 1/4	9140or9450	121	2.38:1
NC44-60	152.4	6	57.2	2 1/4	9140or9450	144.5	2.49:1
NC44-60	152.4	6	71.4	2 13/16	9140or9450	144.5	2.84:1
NC44-62	158.8	6 1/4	57.2	2 1/4	9140or9450	149.2	2.91:1
NC46-62(4IF)	158.8	6 1/4	71.4	2 13/16	9140or9450	150	2.63:1
NC46-65(4IF)	165.1	6 2/4	57.2	2 1/4	9140or9450	154.8	2.76:1
NC46-65(4IF)	165.1	6 2/4	71.4	2 13/16	9140or9450	154.8	3.05:1
NC46-67(4IF)	171.4	6 3/4	57.2	2 1/4	9140or9450	159.5	3.18:1
NC50-67(41/2IF)	171.4	6 3/4	71.4	2 13/16	9140or9450	159.5	2.37:1
NC50-70(41/2IF)	177.8	7	57.2	2 1/4	9140or9450	164.7	2.54:1
NC50-70(41/2IF)	177.8	7	71.4	2 13/16	9140or9450	164.7	2.73:1
NC50-72(41/2IF)	184.2	7 1/4	71.4	2 13/16	9140or9450	169.5	3.12:1
NC56-77	196.8	7 3/4	71.4	2 13/16	9140or9450	185.3	2.70:1
NC56-80	203.2	8	71.4	2 13/16	9140or9450	190.1	3.02:1
6 5/8REG	209.6	8 1/4	71.4	2 13/16	9140or9450	195.7	2.93:1
NC61-90	228.6	9	71.4	2 13/16	9140or9450	212.7	3.17:1