It is used to simultaneously slow down or eliminate the vertically or horizontally shock from drill string. It can reduce the damage due to shocking to drill bit, drilling tool and surface drilling tool so that the purpose of raising drilling speed tool so that the prupose of raising drilling speed and of reducing drilling cost shall be reached.Type OD ID Max. stroke Temperature ambient Max. torque Max. bit weight Tensile load Overlength Thread API SJ121B 121 38 120 -40~ 150 10 200 1000 4490 NC38 SJ160C 160 47 120 -40~ 150 15 340 1500 5150 NC46 SJ178C 178 57 120 -40~ 150 15 400 1500 5590 NC50 SJ203B 203 64 120 -40~ 150 20 480 1960 5800 65/8” SJ229B 229 71 120 -40~ 150 20 540 1960 5630 75/8”
