Specifications
Meet API Spec 8A/8C standardCE/ISO certificate.
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Shock Sub SJ
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 159 | SJ165 | SJ 178 | SJ 203 | 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 °C | 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 (661500) |
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) |
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