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1. AISI 4145H alloy steel,ect, 2. API Spec., 3. OD:79.4mm-279.4mm, 4. Timely delivery, 5.Factory directly - details see: https://www.machineto.com/api-spiral-drill-collar-for-oilfield-drilling-mining-equipment-10317618

Spiral drill collar-Mining Equipment

♦ The Petroleum drilling tools of Zhongzhong's mainly include Drill collars, Spiral drill collars, Non magnetic drill collars, Short drill collars, Drill tool stabilizers, Non magnetic drill tool stabilizers, Integral heavy weight drill pipes, etc.

♦ The details of Spiral drill collar as follows,

1. Material: AISI 4145H Alloy steel, Non magnetic steel, etc.

2. Shape: It is a kind of drill collar which adds three dextrogyrate spiral groove on the outer circle of ordinary drill collar when processing, and the purpose is to reduce the area of contact and friction with the well wall, which can effectively prevent the pressure sticking.

3. Use: It is mainly used between the drill head and the drill pipe, so that it can make the drill head work reposefully and keep right trace by providing the pressure and weight for drill head.

4. Standard: API Spec 7-1 or SY/T5144 Standard.

5. Inspection&Test: When producing, traceability are maintained from the receipt of raw material to completion of final products, and serial numbers are die-stamped on each workpiece body. During each manufacturing process, inspection and test are performed.

6.Specification:

Connections	OD		ID		Length mm	Bevel Diameter Df mm	Reference Bending Strength Ratio
	mm	in	mm	in
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	915 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
NC46-67	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 5/8REG	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 5/8REG	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

7.Spiral Groove Size:

OD		Depth of cut A mm	Pitch ±25.4 mm	Depth of cut B mm
mm	in
98.4	3 7/8	4.0±0.79	914
101.6~111.1	4~4 3/8	4.8±0.79	914
114.3~130.2	4 1/2~5 1/8	5.6±0.79	965
133.4~146.1	5 1/4~5 3/4	6.4±0.79	1067
149.2~161.9	5 7/8~6 3/8	7.1±1.59	1067
165.1~177.8	6 1/2~7	7.9±1.59	1168
181.0~200.0	7 1/8~7 7/8	8.7±1.59	1626	5.6±0.79
203.2~225.4	8~8 7/8	9.5±1.59	1727	6.4±0.79
228.6~250.8	9~9 7/8	10.3±2.37	1829	7.1±1.59
254.0~276.2	10~10 7/8	11.1±2.37	1930	7.9±1.59
279.4	11	11.9±2.37	2037	8.7±1.59

Manufacture Process

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