The fishing bumper sub is a kind of mechanical downhole jarring tool with long working stroke. It can jar stuck pipe stem repeatedly to loose struckpoint to relase stuck pipe.Type Parameter ZSJ44B ZYSJ46B ZSJ56B ZSJ63B ZSJ708B ZSJ80B O.D. (mm) 114 121 146 159 178 203 I.D. (mm) 38 38 51 51 70 70 Sealing pressure 20 20 20 20 20 Max.Tensile load (KN) 112 122 132 143 153 163 Stroke(mm) 1000 1000 1200 1400 1400 1500 Threads API NC31 NC38 NC40 Nc50 NC50 65/8”REG Closed length 2100 2100 2300 2600 2650 2740
