API standard oilfield fishing tools releasing back off spear

Releasing back off spear is used for fishing, back off and releasing the fish. It can catch and transmit left hand torque during back off. It can instead of left hand taper taps and die collars. The function is similar to back off sub.The difference is that it doesn’t need to make up thread with fish and catch at any part internallyReleasing back off spear is used for fishing, back off and releasing the fish. It can catch and transmit left hand torque during back off. It can instead of left hand taper taps and die collars. The function is similar to back off sub.The difference is that it doesn’t need to make up thread with fish and catch at any part internallyReleasing back off spear is used for fishing, back off and releasing the fish. It can catch and transmit left hand torque during back off. It can instead of left hand taper taps and die collars. The function is similar to back off sub.The difference is that it doesn’t need to make up thread with fish and catch at any part internally
Specification
Model Size Fishing ID
mm(inch) Tensile
Load
(KN) Initial Puling Force and Relevant Torque Conn.　
Pulling Force
(KN) Torque
N•M
DLM-T60 2 3/8 50.8(2) 330 147 4313 2 7/8REG
DLM-T73 2 7/8 69.9(2 3/4) 500 166 5799 NC31
DLM-T114 4 1/2 101.6(4) 850 196 11522 4 1/2REG
DLM-T140 5 1/2 125.7(4 61/64) 880 196 13263 NC50