H type safety joint, which is installed on the position required for subsurface drill stem and can bear in fishing operation all kinds of loads for pulling or pressing and used to transmit torque, is a subsurface safety equipment. In down hole operation, when necessay, the safety joint can be easy to discharge off so as to take out the drill stem above it. It is easy to connect the safety joint to ensure a continuous fishing operation when running in hole again.Type OD(mm) ID(mm) Thread conn. HAJ89 89 15 NC26 HAJ95 95 20 NC26 HAJ105 105 30 NC31 HAJ121 121 38 NC38 HAJ159 159 50 NC46, NC50 HAJ165 165 50 NC46,NC50 HAJ178 178 57 NC50,51/2FH HAJ203 203 71.4 65/8”REG
