| Customization: | Available |
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| Customized: | Customized |
| Standard: | API |
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The Symmetric/Concentric drilling system is designed to drill and case a hole simultaneously through unstable ground conditions. The driver bit incorporated with a satisficial ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, and thus minimizing the disruption of the surrounding of the drill hole.
| model | casing tube O.D./mm | bit diameter/mm | casing shoe I.D./mm | maximum reaming O.D. /mm | hammer style |
| 146 | 146 | 123.5 | 116 | 156 | 4" |
| 168 | 168 | 146 | 140 | 184 | 5" |
| 178 | 178 | 157 | 150 | 194 | 5" |
| 183 | 183 | 160 | 152 | 198 | 5" |
| 194 | 194 | 178 | 164 | 208 | 6" |
| 219 | 219 | 203 | 192 | 234 | 6-7" |
| 245 | 245 | 217 | 205 | 260 | 6-8" |
| 273 | 273 | 246 | 233 | 291 | 8" |
| 325 | 325 | 297 | 282 | 340 | 8-10" |
| 377 | 377 | 351 | 332 | 405 | 10-12" |
Scope of application: suitable for small and medium grouting holes in water wells, geothermal wells, short shrinkage holes, buildings, dams, and port projects. If you have any questions about the product, you can contact me and I will answer it for you
Jining Hengwang Mining Machinery Co., Ltd. which belong to Shandong Hengwang Group Co., Ltd., is located in Shiqiao Industrial Park, Jining City, Shandong Province, China. Our Group occupies an area of about 40,000 square meters.It is a comprehensive enterprise integrating piling and drilling rig design, manufacture and installation.
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