Mechanical Hydraulic Shock Sub Type DHJ

The mechanical and hydraulic shock sub type "DHJ" is a two-function shock sub that absorbs the pulsate and shock from drill tools by dish spring and hydraulic oil to store the energy. It 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 DHJ121 DHJ 159 DHJ178 DHJ203 OD mm 121~203 ID mm 38~71.4 Overall Stroke mm 100~140 Max Working Load mm 40~70 Ambient Temperature -40~+150 Overall Length Extended mm 3400~4700