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  • DTH Symmetrix bit
  • DTH Symmetrix bit
  • DTH Symmetrix bit
DTH Symmetrix bitDTH Symmetrix bitDTH Symmetrix bit

DTH Symmetrix bit

  • MOQ: 1 pc
  • Delivery time: 1 to 30 days
  • Packing: Plywood case
  • Country of origin: China
  • Product description:DTH Concentric casing drilling system or called Symmetrix casing drilling system.
  • INQUIRY

When drilling in loose, unconsolidated so-called overburden formations, It is difficult to retrieve the drill strings after the hole has been drilled, the bore hole is often lost before a casing tube can be inserted to support it, currently there are Eccentric and Concentric two types of Overburden drilling systems represent the latest technology in simultaneous casing advancement.

Concentric casing drilling system or called Symmetrix system by Atlas copco and Centrex system by Sandvik, which enables you to drill and case deep holes simultaneously in all types of formation, even those with large boulders. The Symmetrix system are made up of a central pilot bit, a casing shoe and a symmetrical ring bit, casing diameters from 114 mm (Symmetrix 114) to 1220 mm (Symmetrix 1220) can be used.

Symmetrix drilling steps:

1). The integrated casing shoe and ring bits assembly is welded to casing prior drilling, then lock the assembly into pilot bits with hammer to start drilling.

2). When casing is installed in required overburden bedrock, simply unlock pilot bits with reverse rotation to retrieve the drill strings with pilot bits out, leave the casing, casing shoe and ring bits in the hole.

3). Continue drilling with a conventional drill strings or retrieve the casing, casing shoe and ring bits out for next processes.


Model

Casing O.D

Casing I.D

Ring Bit O.D

Ring Bit I.D

Normal bit max O.D

Hammer

Symmetrix 114

114 mm

94 mm

122 mm

86 mm

84 mm

3.5"

126 mm

Symmetrix 127

127 mm

107 mm

136 mm

95 mm

93 mm

142 mm

Symmetrix 140

140 mm

120 mm

148 mm

100 mm

97 mm

4"

161 mm

Symmetrix 146

146 mm

126 mm

154 mm

112 mm

110 mm

165 mm

Symmetrix 168

168 mm

142.6 mm

180 mm

130 mm

127 mm

5"

188 mm

Symmetrix 178

178 mm

152.6 mm

186 mm

133 mm

131 mm

196 mm

Symmetrix 194

194 mm

168.6 mm

202 mm

147 mm

145 mm

6"

214 mm

Symmetrix 219

219 mm

193.6 mm

228 mm

172 mm

170 mm

243 mm

Symmetrix 245

245 mm

219.6 mm

254 mm

198 mm

195 mm

8"

268 mm

Symmetrix 254

254 mm

228.6 mm

265 mm

205 mm

203 mm

276 mm

Symmetrix 273

273 mm

247.6 mm

285 mm

225 mm

223 mm

298 mm

Symmetrix 325

325 mm

299.6 mm

338 mm

278 mm

276 mm

350 mm

Symmetrix 406

406 mm

380.6 mm

420 mm

352 mm

350 mm

12"

442 mm

Symmetrix 508

508 mm

482.6 mm

522 mm

418 mm

416 mm

545 mm



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Phone: +86 851 8577 3056 / 8569

Email:sales@rotarypercussivedrill.com

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