文档介绍：J EREH INTERNATIONAL JAR Super Fishing Jar Super fishing jar is designed to permit the operator to eas ily and simply control the int ensity of the jarring blow within a wide range, from a very light impact to a blow of very high impact. Various model of super fishing jar are available as below. Technical Specifications of Super Fishing Jar Model Pull-down Length (mm) . (mm) . (mm) Stroke (mm) Tensile Load (KN) Max. Tension Downhole (KN) Sealing Pressure MPa Highest Working Temp. API Connection CSJ42 3,980 108 32 305 700 300 20 150 NC31 CSJ44 3,980 114 51 305 780 340 20 150 NC31 CSJ46 3,980 121 51 305 980 400 20 150 NC38 CSJ62 4,098 160 57 320 1,270 700 20 150 NC50 CSJ64 4,177 165 57 320 1,370 750 20 150 NC50 CSJ65 4,177 168 57 320 1,470 800 20 150 NC50 CSJ70 4,250 178 60 320 1,570 800 20 150 NC50 CSJ80 4,318 203 70 330 1,870 800 20 150 6-5/8 REG Surface Jar The surface jar is an effective tool to be used when you are stuck off bottom. The jarring strength of jar can be easily adjusted. The surface jar, which not only can b ear heavy load and strong torque, but also owns a good sealing property and can withstand the mud circulation with high pump pressure. Technical Specifications of Surface Jar Model JDDJ46(4-3/4”) JDDJ70(7”) . mm (in.) 121 (4-3/4) 178 (7) Max. Jarring Force MN (tf) (61±5) (80±5) Max. Tension