Dongying Kaihao Petroleum Equipment Co. Ltd._Back Off Sub
 
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Back Off Sub

 

Back Off Sub

Brief introduction

Back off sub can replace taper tap in back-off operation while dealing with stuck accident. When fishing or backing off, if fish is stuck or cannot back-off, it can be withdrawn at the back off sub, and lifts out fishing drill tool.

Specifications:

Technical specifications ;  

Model  

O.D mm

Joint thread  

Left-hand thread

Fishing thread

Right-hand thread

Tensile strength

 

KN  

Torsional Strength

KN/M

 

DJT105

105

2 7/8IF

2 7/8IF

500

9

DJT121

120

NC38

NC38

900

15

DJT159

159

NC50

NC50

1500

35

DJT165

165

NC50

NC56  5-1/2FH

1900

45

DJT178

178

5 1/2FHNC50

5 1/2FH  NC50

2000

50

DJT197

197

6 5/8 REC

6 5/8 REC

2500

65

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