Non-magnetic Drill Collar

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api spec 7-1 non-magnetic drill collar

Product Description

Product Parameters

The Non-magnetic drill collars are made oflow carbon stainless steel and meet the requi- rements of APl Spec.7and SY/T5144.All threads are phosphated,copperized or cold worked. Al lconnections are equipped with pressed steel threadprotectors.All threads are machined withCNC Lathes-Double-shouldered and special threads.

Non-magnetic drill collar specifications
Drill Collar Number	OD		ID		Length mm	Shoulder chamfer diameter Df mm	Bending strength ration
Drill Collar Number	mm	in	mm	in	Length mm	Shoulder chamfer diameter Df mm	Bending strength ration
NC23-31	79.4	3 1/8	31.8	1 1/4	9150	76.2	2.57:1
NC26-35	88.9	3 1/2	38.1	1 1/2	9150	82.9	2.42:1
NC31-41	104.8	4 1/8	50.8	2	9150or9450	100.4	2.43:1
NC35-47	120.7	4 3/4	50.8	2	9150or9450	114.7	2.58:1
NC38-50	127	5	57.2	2 1/4	9150or9450	121	2.38:1
NC44-60	152.4	6	57.2	2 1/4	9150or9450	144.5	2.49:1
NC44-60	152.4	6	71.4	2 13/16	9150or9450	144.5	2.84:1
NC44-62	158.8	6 1/4	57.2	2 1/4	9150or9450	149.2	2.91:1
NC46-62	158.8	6 1/4	71.4	2 13/16	9150or9450	150	2.63:1
NC46-65	165.1	6 1/2	57.2	2 1/4	9150or9450	154.8	2.76:1
NC46-65	165.1	6 1/2	71.4	2 13/16	9150or9450	154.8	3.05:1
NC46-67	171.4	6 3/4	57.2	2 1/4	9150or9450	159.5	3.18:1
NC50-67	171.4	6 3/4	71.4	2 13/16	9150or9450	159.5	2.37:1
NC50-70	177.8	7	57.2	2 1/4	9150or9450	164.7	2.54:1
NC50-70	177.8	7	71.4	2 13/16	9150or9450	164.7	2.73:1
NC50-72	184.2	7 1/4	71.4	2 13/16	9150or9450	169.5	3.12:1
NC56-77	196.8	7 3/4	71.4	2 13/16	9150or9450	185.3	2.70:1
NC56-80	203.2	8	71.4	2 13/16	9150or9450	190.1	3.02:1
65/8REG	208.6	8 1/4	71.4	2 13/16	9150or9450	195.7	2.93:1
NC61-90	228.6	9	71.4	2 13/16	9150or9450	212.7	3.17:1
75/8REG	241.3	9 1/2	76.2	3	9150or9450	223.8	2.81:1
NC70-97	247.6	9 3/4	76.2	3	9150or9450	232.6	2.57:1
NC70-100	254	10	76.2	3	9150or9450	237.3	2.81:1
85/8REG	279.4	11	76.2	3	9150or9450	266.7	2.84:1

Mechanical properties of non-magnetic drill collars
OD		Yield strength		Tensile strength		Elongation	Shrinkage	Hardness	Impact Akv
mm	in	Ksi	Mpa	Ksi	Mpa	%	%	HB	J
≤180	≤7	≥120	≥828	≥135	≥931	≥25	≥50	285-360	≥75
>180	>7	≥110	≥759	≥130	≥897	≥25	≥50	285-360	≥75