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| Categories | DTH Drill Bits | 
|---|---|
| Brand Name: | MIROC | 
| Model Number: | Symmetric casing system with reamer | 
| Certification: | ISO | 
| Place of Origin: | CHINA | 
| MOQ: | 1 | 
| Price: | Negotiation | 
| Supply Ability: | 5000 pcs per month | 
| Delivery Time: | 15-20 days | 
| Packaging Details: | Standard export packing | 
| Material: | Carbon Steel | 
| Application: | Water well drilling, Geothermal well drilling | 
| Buttons: | Spherical, Ballistic | 
| Face Type: | Flat, Concave, Covex | 
| Product Name: | Symmetric Overburden Drilling Equipment | 
| Advantage: | High wear resistant cemented carbide | 
| Processig type: | forging | 
| Packing: | Wooden cace or as requrements | 
| Company Info. | 
| KSQ Technologies (Beijing) Co. Ltd | 
| Verified Supplier | 
| View Contact Details | 
| Product List | 
Symmetric Casing System with reamer Symmetric Bit for Overburden Drilling
The Symmetric Casing Drilling system consists of three parts: central pilot bit, casing shoe and symmetrical ring bit. The central pilot bit drills away the center part of the hole and guides the drill string, incorporated with a sacrificable symetrical ring bit make a full face drill bit.
Advantages of Symmetric Drilling

 
Specification
| Casing OD (mm) | Casing wall max (mm) | Ring bit ID (mm) | Ring Bit OD (mm) | Pilot Bit OD (mm) | Hammer | 
| 114.3 | 6/10 | 91/78 | 128/124 | 100/92.5 | ND35 | 
| 126.7 | 7 | 99 | 140 | 110 | ND35 | 
| 139.7 | 7/10 | 116/94 | 154/150 | 124/117.5 | ND45/NOL4 | 
| 168.3 | 8/12.7 | 142/121 | 182/178 | 150/140 | ND55/NQL5 | 
| 178.3 | 10 | 145 | 195 | 156 | ND55/NQL5 | 
| 193.7 | 6/12.7 | 167/148 | 212/203 | 180/167 | ND65/NQL6 | 
| 219.1 | 7/12.7 | 186/167 | 234 | 203/191 | ND65/NQL6 | 
| 273 | 8/12.7 | 232/219 | 292 | 255/246 | ND85/NQL8 | 
| 323.9 | 8/12.7 | 281/270 | 342/342 | 306/297 | ND85/NQL8 | 
| 406.4 | 12.7 | 328 | 419 | 374 | NSD10/N125 | 
| 508 | 15 | 412 | 526 | 470 | ND475/SD15 | 
| 609.6 | 15 | 513 | 637 | 570 | ND525/SD18 | 
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