Model “DHJ” Mechanical -Hydraulic Shock Sub, which can adopt the dished spring and silicone oil, is a two-action shock sub, being able to absorb the bounce and jounce of drill tool. It has advantages of good serviceability, high load bear and long service life. It has a characteristic of changing the rigidity as to protect the bit optimally, suiting the requirement of different layer.
Specifications
| Model | O.D. mm(in) | I.D. mm (in) | Connection | Max Working Load kN(lbf) | Max working torgue kN · m (lbf·ft) | Max Compression kN(lbf) | Max. Stroke mm(in) | MPa | kN/mm (1000×lbf/in) |
| DHJ121 | 121(4-3/4) | 38.1(1-1/2) | NC38 | 1100 (247280) | 10(7373) | 300 (67440) | 100 (3-15/16) | 30 | 2.4～7.5(13.6～42.6) |
| DHJ159 | 159 (6-1/4) | 50.8(2) | NC46 | 2010 (451848) | 15 (11059) | 450 (101160) | 120 (4-3/4) | 2.9～7.5(16.5～42.7) | |
| DHJ165 | 165 (6-1/2) | 50.8(2) | NC50 | 2010 (451848) | 15 (11059) | 450 (101160) | 120 (4-3/4) | 2.9～7.5(16.5～42.7) | |
| DHJ178 | 178(7) | 57.2(2-1/4)) | NC50 | 1672 (375865) | 15 (11059) | 450 (101160) | 120(4-3/4) | 2.9～7.5(16.5～42.7) | |
| DHJ203 | 203 (8) | 71.4(2-13/16) | 6 5/8REG | 2000 (448000) | 20(14746) | 550 (123640) | 140(5-1/2) | 3.2～8(18.2～45.5) | |
| DHJ229 | 229 (9) | 71.4 (2-13/16) | 7 5/8REG | 2500 (740000) | 20 (14746) | 650 (146000) | 140(5-1/2) | 3.5～10(19.9～56.9) | |
| DHJ241 | 241 (9-1/2) | 71.4 (2-13/16) | 7 5/8REG | 4100 (921680) | 25 (18433) | 650 (146000) | 140(5-1/2) | 3.5～10(19.9～56.9) | |
| DHJ279 | 279 (11) | 76.2 (3) | 8 5/8REG | 4500 (1010000) | 30(22119) | 650 (146000) | 140 (5-1/2) | 3.5～10(19.9～56.9) |