Drill collar

Drill collar is made of AISI4145H Cr-Mo steel in accordance with API Specifications and SY/T5144 Standards. Threads can be processed with cold rolling, coppering or phosphating. We can process double-shoulder threads and other specifications of special threads and can also produce drill collars whose outer diameter is 14 inches.

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Drill collar

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Drill collar

● Standard dimension, inner diameter and threads

Connection#	OD		ID		mm Length	Shoulder chamfer diameter D, mm	Bending strength ratio
Connection#	mm	in	mm	in	mm Length	Shoulder chamfer diameter D, mm	Bending strength ratio
NC23-31	794	31/8	31.8	11/4	9150	76.2	2.57:1
NC26-35	88.9	31/2	38.1	11/2	9150	82.9	2.42:1
NC31-41	104.8	41/8	50.8	2	9150 or 9450	100.4	2.43:1
NC35-47	120.7	43/4	50.8	2	9150 or 9450	114.7	2.58:1
NC38-50	127.0	5	57.2	21/4	9150 or 9450	121.0	2.38:1
NC44-60	152.4	6	57.2	21/4	9150 or 9450	144.5	2.49:1
NC44-60	152.4	6	71.4	213/16	9150 or 9450	144.5	2.84:1
NC44-62	158.8	61/4	57.2	21/4	9150 or 9450	149.2	2.91:1
NC46-62	158.8	61/4	71.4	213/16	9150 or 9450	150.0	2.63:1
NC46-65	165.1	61/2	57.2	21/4	9150 or 9450	154.8	2.76:1
NC46-65	165.1	61/2	71.4	213/16	9150 or 9450	154.8	3.05:1
NC46-67	171.4	63/4	57.2	21/4	9150 or 9450	159.5	3.18:1
NC50-67	171.4	63/4	71.4	213/16	9150 or 9450	159.5	2.37:1
NC50-70	177.8	7	57.2	21/4	9150 or 9450	164.7	2.54:1
NC50-70	177.8	7	71.4	213/16	9150 or 9450	164.7	2.73:1
NC50-72	184.2	71/4	71.4	213/16	9150 or 9450	169.5	3.12:1
NC56-77	196.8	73/4	71.4	213/16	9150 or 9450	185.3	2.70:1
NC56-80	203.2	8	71.4	213/16	9150 or 9450	190.1	3.02:1
65/8REG	208.6	81/4	71.4	213/16	9150 or 9450	195.7	2.93:1
NC61-90	228.6	9	71.4	213/16	9150 or 9450	212.7	3.17:1
75/8REG	241.3	91/2	76.2	3	9150 or 9450	223.8	2.81:1
NC70-97	247.6	93/4	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
85/8REG	279.4	11	76.2	3	9150 or 9450	266.7	2.84;1

Elevator groove and slip groove

We can produce drill collars equipped with elevator groove or slip groove in accordance with API Specifications at the request of users.

Drill collar

Dimensions of drill collar elevator groove/slip groove

Outer diameter of drill collar OD	Depth of elevator groove L_E±0.2	R₁^C	Angle αb	Depth of slip groove L_S±0.4	Angle βb
101.6-117.5	5.6	3.2+0.4	4°	4.8	3.5°
120.6-142.9	6.4	3.2+0.4	5°	4.8	3.5°
146.0-168.3	7.9	3.2+0.4	6°	6.4	5°
171.4-219.1	9.5	4.8+0.8	7.5°	6.4	5°
≥222.2	11.1	6.4+0.8	9°	6.4	5°

Mechanical properties of drill collar

OD Outer diameter scope		Yield strength σ0.2 Mpa	Control strength σb Mpa	Elongatio δ₄ %	Brinell hardness	Charpy impact force A_K J
mm	in
79.4~174.6	31/8-63/4	≥758	≥965	≥13	≥285	≥54
177.8~279.4	7~11	≥689	≥931

Main tolerance dimensions of drill collar

OD Outer diameter scope		OD	ID	Length	Shoulder chamfer diameter
mm	in	OD	ID	Length	Shoulder chamfer diameter
≤88.9	≤31/2	+1.2 0	+1.6 0	+152.4	40.4
>88.9~114.3	>31/2~41/2	+1.6 0
>114.3~139.7	>41/2~51/2	+2.0 0
>139.7~165.1	>51/2~61/2	+3.2 0
>165.1~215.9	>61/2~81/2	+4.0 0
>215.9~241.3	>81/2~91/2	+4.8 0
>241.3	>91/2	+6.4 0

Drill collar thread connecting part stress dispersion groove

Thread type	Length from the internal thread shoulder side to the next tooth of indented mark L_X ±1.59 mm	Diameter of the cylindrical section of the internal thread Dcb +0.40 -0 mm	Taper of the bore-hole after the cylindrical section of the internal thread ±20.83 mm/m	External thread groove D_RC +0 -0.79 mm	Length from the replaceable internal thread shoulder side to the stress dispersion groove L_RG +0 -3.18 mm
NC35	82.6	82.15	166.67	82.15	85.73
NC38	88.9	88.11	166.67	89.10	92.08
NC40	101.6	92.87	166.67	95.81	104.78
NC44	101.6	101.60	166.67	106.36	104.78
NC46	101.6	106.76	166.67	109.93	104.78
NC50	101.6	117.48	166.67	120.45	104.78
NC56	114.3	121.84	250.00	134.04	117.48
NC61	127.0	132.95	250.00	148.31	130.18
NC70	139.7	152.00	250.00	170.54	142.88
NC77	152.4	166.29	250.00	188.01	155.58
65/8REG	114.3	134.14	166.67	137.59	117.48
75/8REG	120.7	148.83	250.00	161.26	123.83
85/8REG	123.8	172.24	250.00	185.45	127.00

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Internal thread dorsal pore stress dispersion groove / external thread stress dispersion groove / replaceable internal thread stress dispersion groove

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Telephone: 86-13203935825

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sales@zuolintool.com

Tel: 86-13203935825

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Welcome to fill in the following form, fill in your product requirements, contact information and other information, we will quickly feedback your purchase consultation. You can also contact us through online consultation, email, etc., and our customer service team will further provide you with quality service.

Quick access toTechnical SupportandDetailed Quotations

Welcome to fill in the following form, complete your product requirements, contact information and other information, we will quickly feedback your purchase consultation. You can also contact us through online consultation, e-mail , and our customer service team will further provide you with excellent service.