Xi'An Tiptop Machinery Co., Ltd.
Xi'an Tiptop Machinery Co., Ltd. Oilfield Comprehensive Solution Provider One-Stop Procurement Service Provider Downhole Drilling Tools Expert
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Back off Sub, Back off Spear, Downhole Fishing Tool, 4 1/8''~8''
Back-off sub is also called back off spear. 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 When fishing or backing off, if fish is stuck or cannot back-off, it can be withdrawn at the back off sub, and lifts out fishing drill tool.
Please email us for your back off spear inquries.
Specification
| OD mm (inch) | Connection | ID mm (inch) | OAL mm (inch) |
| 105 (4 1/8) | NC31B LH×NC31P | 15 (19/32) | 580 (22 13/16) |
| 121 (4 3/4) | NC38B LH×NC38P | 22 (57/64) | 628 (24 3/4) |
| 159 (6 1/4) | NC50B LH×NC50P | 28 (1 1/8) | 690 (27 3/16) |
| 165 (6 1/2) | NC50B LH×NC50P | 28 (1 1/8) | 690 (27 3/16) |
| 168 (6 5/8) | NC50B LH×NC50P | 28 (1 1/8) | 690 (27 3/16) |
| 178 (7) | 6 5/8REGB LH×6 5/8REP | 32 (1 1/4) | 700 (27 9/16) |
| 203 (8) | 6 5/8REGB LH×6 5/8REP | 35 (1 3/8) | 723 (28 1/2) |
