Two-way Shock Sub Type SJ

The two-way shock sub type "SJ" is an effective shock absorbing device. It can be used to reduce or eliminate both transversal and longitudinal vibration of drill string, thus it helps maintain normal weight-on-bit (WOB) and torque, so that it helps to reduce drill string connection fatigue and prolong drill string life. Type SJ 121 SJ 159Ⅳ SJ165 SJ 178Ⅳ SJ 203 III SJ 229 III SJ254 SJ279II O.D. mm（in.） 121 (4 3/4) 159 (6 1/4) 165 （6 1/2） 178 (7) 203 (8) 229 (9) 254 (10) 279 (11) I.D. mm（in.） 38 (1 1/2) 48 （1 7/8） 48 （1 7/8） 57 (2 1/4) 65 (2 1/2) 71.4 (2 13/16) 71.4 (2 13/16) 76.2 (3) Max. Working Stroke mm（in.） 100 (3.94) 120 （4.72） 120 （4.72） 120 (4.72) 120 (4.72) 140 (5.51) 120 (4.72) 160 (6.3) Ambient Temperature ℃ 120~180 -40~150 -40~150 -40~150 -40~150 -40~150 -40~150 40~150 Max. Working Torque kN·m (Lbf·m) 10 (2250) 15 (3375) 15 （3375） 15 (3375) 20 (4500) 20 (4500) 25 (5625) 30 (6750) Max. Working Load kN (Lbf) 300 (67500) 340 (76500) 340 (76500) 350 (78000) 450 (100000) 540 (121500) 600 (135000) 600 (1350000) Max. Tensile Load MN (Lbf) 1.2 (270000) 1.5 (337500) 1.9 427500) 1.9 (427500) 1.96 (441000) 2.16 (486000) 2.54 (571500) 2.94 (6 Overall Length mm (in.) 4208 (165.67) 5494 （216.3） 5494 （216.3） 5735 (213.19) 6080 (239.37) 6080 (239.37) 6400 (251.97) 5580 (219.69) Connection API NC38 NC46 NC46 NC50 6 5/8 REG 7 5/8 REG 8 5/8 REG 8 5/8 REG Average Rigidity kN/mm (Lbf/mm) 3.5 (787) 3.5 (787) 3.5 （778） 3.9 (877) 3.9 (877) 3.5 (787) 3.5 (787) 3.5 (787)