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Drilling Collar

Our drilling collars were developed to provide the market with more reliable technology and more hoisting performance. Manufactured strictly according to API Spec7-1 standard with material of AISI 4145 Mod. Multiple choices, such as slick drill collars, spiral drill collars, non-magnetic drill collars and other types. Included but not limited by the advantages mentioned, ZT series drilling collars might be your best choice.
General Features
• Manufactured according to API 7-1
• Suitable for onshore or offshore rigs
• Suitable for cold area and desert environment

Main Specifications
Size: 3-1/8” – 11” (79.4 mm – 279.4 mm)

Parameters

Model
D
d
L (mm)
DF (mm)
Bending Strength ratio
Drill Collar
mm
in
mm
in
Nominal size
ZT 3-1/8
79.4
3-1/8
31.8
1-1/2
9,150
76.2
2.57:1
NC23-31
ZT 3-1/2
88.9
3-1/2
38.1
1-1/2
9,150
82.9
2.42:1
NC26-35 (2-3/8IF)
ZT 4-1/8
104.8
4-1/8
50.8
2
9,150
100.4
2.43:1
NC31-41 (2-7/8IF)
ZT 4-3/4
120.7
4-3/4
50.8
2
9,150
114.7
2.58:1
NC35-47
ZT 5
127
5
57.2
2-1/4
9,150
121
2.38:1
NC38-50 (3-1/2IF)

Drilling Collar

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