Concentric Casing System with Ring Bits

Concentric Casing System with Ring Bits

Maxdrill’s concentric casing system can be applied to overburden formations with complex topographic and geological conditions, such as gravel, fissure formations, boulder, landfill of construction refuse, etc.

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Features
  • Straightness: ensures the straightness of borehole in different topographic and geological conditions.
  • Adaptability: ensures penetration efficiency in complex topographic and geological conditions, such as gravel and landfill of construction refuse.
  • Lower torque: the torque of the concentric casing system is less than eccentric casing system.
  • Easy to unlock and re-lock: easy to re-lock after unlock.
  • Drilling at any angle: concentric casing system can drill rocks at any angle.
  • Environmentally friendly: the concentric casing system is greener than the eccentric casing system as it drills rocks smoothly with less vibration and noise. We recommend the use of the concentric casing system in urban areas.
Component Parts
Casing Shoe

Casing Shoe

Ring Bit

Ring Bit

Pilot Bit

Pilot Bit

Component Parts
D h H C G
Part No. O.D of Casing Tube (mm) I.D of Casing Tube (mm) Wall thickness of Casing Tube (mm) Max. O.D of Pilot Bit (mm) Reamer Dia.(mm) Max. O.D of Normal Bit (mm) DTH Hammer /TOP Hammer Type Weight (Kg)
Top Hammer Type
MDC76/7RR-01 76 62 7 57 84 39 R32 3.2
MDC89/8RR-01 89 73 858 70 96 58 T38 5.8
MDC114/10RR-01 114 94 10 92 122 80 T45 7.5
MDC127/10RR-01 127 107 10 105 136 90 T45 10
MDC140/10RR-01 140 120 10 116 148 97 T45/T51 15
DTH Hammer Type
MDC114/10RR-02 114 94 10 92 122 80
COP34/DHD3.5 		10
MDC127/10RR-02 127 107 10 105 136 90 COP34/DHD3.5 16
MDC140/10RR-02 140 120 10 116 148 97 COP44/DHD340 /SD4/QL40 21
MDC146/10RR-02 146 126 10 124 154 110 COP44/DHD340 /SD4/QL40 22
MDC168/12.7RR-02 168 142.6 12.7 141 180 125 COP54/DHD350 /SD5/QL50/M50 27
MDC178/12.7RR-02 178 152.6 12.7 150 186 135 COP54/DHD350 /SD5/QL50/M50 32.5
MDC194/12.7RR-02 194 168.6 12.7 166 202 145 COP64/DHD360 /SD6/QL60/M60 42.5
MDC219/12.7RR-02 219 193.6 12.7 191 228 170 COP64/DHD360 /SD6/QL60/M60 58
MDC245/12.7RR-02 245 219.6 12.7 214 254 195 COP84/DHD380 /SD8/QL80 78
MDC254/12.7RR-02 254 228.6 12.7 224 265 203 COP84/DHD380 /SD8/QL80 84.5
MDC273/12.7RR-02 273 247.6 12.7 241 286 223 COP84/DHD380 /SD8/QL80
 100
MDC325/12.7RR-02 325 299.6 12.7 292 338 276 COP84/DHD380 /SD8/QL80 135
MDC406/12.7RR-02 406 380.6 12.7 377 420 350 QL120/DHD112/ SD12/NUMA120 280
MDC508/12.7RR-02 508 482.6 12.7 478 522 416 QL200/SD18/ NUMA180 522
MDC560/12.7RR-02 560 534.6 12.7 528 575 475 QL200/SD18/ NUMA180 620
MDC610/12.7RR-02 610 584.6 12.7 558 620 513 QL200/SD18/ NUMA180 710

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As a reliable drilling tools manufacturer with a focus on supplying “Energy-saving, Economical, Efficient” products all along, we gradually become one of the most credible Chinese manufacturers in rock drilling tools industry. Maxdrill is always committed to supplying low cost, high efficiency, energy saving and environment-friendly products for global customers. No matter what types of rocks — soft rock, loose-medium rock, hard rock and any other special formations, just tell us what you need and leave the rest to us, and our customer service is always there to help you meet your requirements.
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