group nameDownhole Tools
Min Order1 piece
modelback off
update timeMon, 08 Apr 2013 00:29:46 GMT
Processing Type Casting
Machine Type fishing tools
Type back-off sub
Use Well Drilling
Certification API
Material Iron
Min Order1 piece
Back-Off Sub
The back-off sub is also named back-off spear. There is usually a left hand thread for tool joint at the upper part of the body, while the expansion sleeve has right hand thread. The guide cone at the lower part can make the expansion sleeve of the sub conveniently screw the fish connection.
Raising the drilling tool, the expansion sleeve can hold the fish firmly, then reverse.
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