NT Overburden Drilling system Manufacturers,NT Overburden Drilling system Suppliers

Description

Introduction

Symmetrical overburden drilling system

Designed with bits extended out when drilling the hole.

Reduce replacement cost of wing bit due to relatively longer life of wing bit

NT System

Model

No.of

Wings

Bit Diameter(mm)

Casing Size(mm)

Applicable

Hammer

Expended

Retracted

I.D.

O.D.

Wall

NT 115

2

155

113

120

140

10.0

ACE40

NT 140

2

185

141

155.2

168.3

6.6

ACE50

NT 150

2

194

153

167

177.8

11.5

ACE50,ACE60

NT 165

2

212

162

178

194

8.0

ACE60

NT 190

3

239

188

203

219

8.0

ACE60,ACE80

NT 215

3

264

213

225.9

244.4

9.3

ACE80

NT 240

3

295

235

254.6

273

9.2

ACE80

NT 250

3

317

248

270

300

15.0

ACE80,TD100

NT 280

3

341

268

304.8

323.9

9.6

ACE80,TD100,TD112

NT 315

3

379

319

335.6

355.6

10.0

ACE120

NT 365

3

425

356

387.4

406.4

9.5

ACE120

NT 410

3

480

408

425

457

16.0

ACE120,TD320

NT 460

4

530

455

482.6

508

12.7

ACE380,TD450

NT 510

4

586

511

533.4

558.8

12.7

TD450

NT 560

4

634

558

584.2

609.6

12.7

TD450,TD550

NT 610

4

682

605

635

660.4

12.7

TD550

NT 660

4

733

656

685.8

711.2

12.7

TD550

NT 710

4

784

707

736.6

762

12.7

TD550

NT 745

4

835

730

781

813

16.0

TD550

NT 810

4

886

809

838.2

863.6

12.7

TD550,TD700

NT 830

4

945

831

889

914.4

12.7

TD700

NT 930

4

1046

931

984.2

1016

15.9

TD800

Other styles are available upon request.

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