Products
Back-off Sub
Back-off Sub
Back-off sub is also called back off spear. It can instead of taper tap to fish or back off when dealing with sticking. If the fish stuck or can’t be back off, we can release from the back off sub, and then trip the drilling tool.
Type |
OD mm(inch) |
Connection |
ID mm(inch) |
OAL mm(inch) |
ZDK105 |
105(4-1/8) |
NC31B反×NC31P |
15(19/32) |
580(22-13/16) |
ZDK121 |
121(4-3/4) |
NC38B反×NC38P |
22(57/64) |
628(24-3/4) |
ZDK159 |
159(6-1/4) |
NC50B反×NC50P |
28(1-1/8) |
690(27-3/16) |
ZDK165 |
165(6-1/2) |
NC50B反×NC50P |
28(1-1/8) |
690(27-3/16) |
ZDK168 |
168(6-5/8) |
NC50B反×NC50P |
28(1-1/8) |
690(27-3/16) |
ZDK178 |
178(7) |
6-5/8REGB反×6-5/8REP |
32(1-1/4) |
700(27-9/16) |
ZDK203 |
203(8) |
6-5/8REGB反×6-5/8REP |
35(1-3/8) |
723(28-1/2) |