Description:
Drill collars are made of AISI 4145H or 4145H modified alloy steel. Its bores are trepanned from one direction with no mismatch. All drill collars are Q&T overall length.
BOBAN makes slick Drill Collars, spiral Drill Collars & also non-magnetic drill collars. with lengths 10-45 feet and OD 3-1/8" - 11".
BOBAN can make high torque threads such as Double shoulder NC31,NC38,NC46,NC50 and 5-1/2”FH specified by clients
BOBAN no-magnetic drill collars are made from chrome manganese low carbon austenitic alloy
Features & Benefits:
1. Excellent lower Magnetic permeability
2. High strength of mechanical properties
3. Outstanding resistant to stress corrosion cracking
4. No tendency to galling
Technical Parameter
Drill Collar Technical Parameter
OD+4mm
Connection
ID+1.59mm
Length±152.4mm
Chamfering Diameter
Length of one spiral ±25.4mm
±0.4mm
79.4
NC23
31.8
9140 or 9450
76.2
679
88.9
NC26
38.1
9140 or 9450
82.9
679
104.8
NC31
50.8
9140 or 9450
100.4
914
114.3
NC31
50.8
9140 or 9450
100.4
914
120.6
NC35
50.8
9140 or 9450
114.7
965
127
NC38
57.2
9140 or 9450
121
965
139.7
NC40
57.2
9140 or 9450
132.2
1067
158.8
NC46
71.4
9140 or 9450
144.5
1067
168.3
NC50
71.4
9140 or 9450
154.8
1168
177.8
NC50
71.4
9140 or 9450
164.7
1168
196.8
NC50/NC56
71.4
9140 or 9450
185.3
1626
203.2
NC56/6 5/8REG
71.4
9140 or 9450
190.1
1727
209.6
6 5/8REG
71.4
9140 or 9450
195.6
1727
215.9
6 5/8REG
71.4
9140 or 9450
195.6
1727
228.6
6 5/8REG
71.4
9140 or 9450
212.7
1829
241.3
7 5/8REG
76.2
9140 or 9450
223.8
1829
254
7 5/8REG/8 5/8REG
76.2
9140 or 9450
237.3
1930
279.4
8 5/8REG
76.2
9140v9450
266.7
2032
Mobile：+86 18710316881
Tel：+86 029 89240853
Email：sales@boban-oiltools.com
Add：No. 1511, Block C, Haibo Guangchang, Fengcheng 9th. Road, Weiyang District, Xi'an, China
We chat
