Hydraulic Shock Sub Type YJ

The Hydraulic Shock Sub type "YJ" is fully hydraulic and is used for reducing vibrations caused by hard formation drilling and keeping the drill bit firmly on the bottom, so that it helps to reduce drill string connection fatigue and prolong drill string life. Type YJ121 YJ178III YJ203III YJ229III OD mm 121~229 ID mm 38~70 Ambient Temperature -40~+150 Max Working Load kN 260~540 Max Tensile Load kN 980~1960 Max Working Torque kN.m 10~19.6