| ZRTG Series Concentric Casing System With Ring Bit Technical Specifications | |||||||
| P/N | Out Dia. Of casing tube | Inner Dia. of casing tube | Reamed Dia. | Min. inner Dia. of casing shoe | Max out Dia. of DTH bit | DTH Hammer | |
| ZRTG105 | 146 | 126 | 152 | 115 | 105 | ZRC4 series | |
| ZRTG125 | 168 | 148 | 174 | 136 | 125 | ZRC5 series | |
| ZRTG135 | 178 | 158 | 184 | 146 | 135 | ZRC5 series | |
| ZRTG140 | 183 | 163 | 189 | 152 | 140 | ZRC5 series | |
| ZRTG165 | 219 | 199 | 225 | 184 | 165 | ZRC6 series | |
| ZRTG220 | 273 | 251 | 280 | 240 | 220 | ZRC8 series | |
| ZRTG series Concentric Casing System Features | |||||||
| Mainly used for geothermal and water well market, high efficiency, very stable, great hole straightness and time saving. | |||||||
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