drill collar, buy Spiral Drill Collars on China Suppliers Mobile

Product Details

The spiral drill collars are made of 4145H modified chromium-molybdenum alloy steel according to API Spec 7 and aSY/T 5144 . All threads can be phosphated,copperised or cold worked. All threads are machined with CNC Lathes-Double-Shouldered and a special thread, the max diameter of spiral drill collar is 14 inch.

Out diamete: 3 7/8"~ 14"(inch)

Depth of cut: 4.0 ~ 11.9 (mm)

Length: 9150+150(mm)

Standard size for drill collar

Connection #	OD		ID		L mm	D_F mm	Bending strength ratio
Connection #	mm	in	mm	In	L mm	D_F mm	Bending strength ratio
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	9150 or 9450	100.4	2.43:1
NC35-47	120.7	4 3/4	50.8	2	9150 or 9450	114.7	2.58:1
NC38-50	127.0	5	57.2	2 1/4	9150 or 9450	121.0	2.38:1
NC44-60	152.4	6	57.2	2 1/4	9150 or 9450	144.5	2.49:1
NC44-60	152.4	6	71.4	2 13/16	9150 or 9450	144.5	2.84:1
NC44-62	158.8	6 1/4	57.2	2 1/4	9150 or 9450	149.2	2.91:1
NC46-62	158.8	6 1/4	71.4	2 13/16	9150 or 9450	150.0	2.63:1
NC46-65	165.1	6 1/2	57.2	2 1/4	9150 or 9450	154.8	2.76:1
NC46-65	165.1	6 1/2	71.4	2 13/16	9150 or 9450	154.8	3.05:1
NC46-47	171.4	6 3/4	57.2	2 1/4	9150 or 9450	159.5	3.18:1
NC50-67	171.4	6 3/4	71.4	2 13/16	9150 or 9450	159.5	2.37:1
NC50-70	177.8	7	57.2	2 1/4	9150 or 9450	164.7	2.54:1
NC50-70	177.8	7	71.4	2 13/16	9150 or 9450	164.7	2.73:1
NC50-72	184.2	7 1/4	71.4	2 13/16	9150 or 9450	169.5	3.12:1
NC56-77	196.8	7 3/4	71.4	2 13/16	9150 or 9450	185.3	2.70:1
NC56-80	203.2	8	71.4	2 13/16	9150 or 9450	190.1	3.02:1
6 5/8 REG	209.6	8 1/4	71.4	2 13/16	9150 or 9450	195.7	2.93:1
NC61-90	228.6	9	71.4	2 13/16	9150 or 9450	212.7	3.17:1
7 5/8 REG	241.3	9 1/2	76.2	3	9150 or 9450	223.8	2.81:1
NC70-97	247.6	9 3/4	76.2	3	9150 or 9450	232.6	2.57:1
NC70-100	254.0	10	76.2	3	9150 or 9450	237.3	2.81:1
8 5/8REG	279.4	11	76.2	3	9150 or 9450	266.7	2.84:1
8 5/8REG	355.6	14	76.2	3	9150 or 9450	266.7	2.84:1