Great antiquity and profession
Mainly used for fishing broken drill rods falling in holes during drilling operation, the fishing tools have common threads of R32, R32L, T35, T38, T38L, T45, T45L, T51, T51L, ST58 and ST68, and fishing threads of female threads (BT style) and male threads (PFT style), Wherein BT stands for an internal taper thread and PFT for an external taper thread.
|Female Thread-BT||R32 R32L T35 T38 T38L T45 T45L T51 T51L ST58 ST68|
|Female Thread-PFT||R32 R35 T35 T38 T38L T45 T45L T51 ST58 ST58L ST68 ST68A|
|Male Thread-PFT||T38M T45M T51M|
|BT:Female Thread;PFT: Male Thread; L: Reinforced.|