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DTH drill bits 8inch

NO.2 Convex Face
For high penetration rates in soft to medium-hard with low to medium air pressures. It is the most resistance to steel wash,and may reduce the load and wear on the gauge buttons,but poor hole deviation control.
NO.3 Double Gauge Face
This kind of face shape is suitable for fast penetration rates in medium to hard rock formations. Designed for high air pressures and good resistance to steel wash step gauge bit.
NO.4 Flat Face
This kind of face shape is suitable for hard to very hard and abrasive rock formations in applications with high air pressures. Good penetration rates can resistance to steel wash.

Quantity:
  • ROS85-200
  • ROSCHEN
  • BIT 85-200

Product Description

 DTH button bits 8” 


8" BIT  Data Referenced By DHD380 Concave Face Bit

dth bits 8inch



Carbide Button Shape Selection

 dth bits shape


How to select Bit Face Shape?

NO.1  Concave Face

The all-round application bit face specifically for medium hard and homogeneous rock formations.

Good hole deviation control and good flushing capacity.

 

NO.2 Convex Face

For high penetration rates in soft to medium-hard with low to medium air pressures.  It is the most resistance to steel washand may reduce the load and wear on

the gauge buttonsbut poor hole deviation control.

NO.3 Double Gauge Face

This kind of face shape is suitable for fast penetration rates in medium to hard rock formations.  Designed for high air pressures and good resistance to steel wash step gauge bit.

 

NO.4 Flat Face

This kind of face shape is suitable for hard to very hard and abrasive rock formations in applications with high air pressures. Good penetration rates can resistance to steel wash.

 

 

NO. 5 Drop Center

For high penetration rates in soft to medium hard and fissured rock formations.  Low

 to medium air pressures. Maximum hole deviation control.

 

NO.6 Pineapple Face

The Pineapple Bit can be dressed with ballistic buttons for use in soft to medium hard formations where fractured rock can be expected, or can be supplied with spherical buttons for hard and abrasive formations. 


dth button bits face shape

dth bits technical data

How to choose the right button bits?

ROSCHEN has a comprehensive range of DTH drill bits to match all conceivable applications. Each bit is made from quality alloy steel, and has been precision machined to produce a perfect body, heat treated to the required hardness, given surface compression for fatigue resistance, and fitted with precision buttons manufactured in-house. These are designed for specific applications for all rock types, hardness's and condition. Bit life and rate of penetration are the most important criteria in selecting the right bit for a particular application. 

       Diameter

No x Button, dimameter,mm

Button angle

FIushing holes

weight

Part    No

mm

inch

Gauge Buttons

Front Buttons

kg

200

7 7/8

10x18

8x18+6x16

38

2

46

ROS85-200

203

8

10x18

8x18+6x16

38

2

47

ROS85-203

216

8 1/2

10x18

8x18+6x16

38

2

53

ROS85-216

219

8 5/8

10x18

8x18+6x16

38

2

54

ROS85-219

222

8    3/4

10x18

8x18+6x16   

38

2

55

ROS85-222

225

8 7/8

10x18

8x18+7x16   

38

2

56

ROS85-225

229

9

10x18

8x18+7x16   

38

2

57

ROS85-229

235

9    1/4

12x18

30x16

38

2

57.5

ROS85-235

240

9    1/2

12x18

30x16   

38

2

58

ROS85-240

254

10

12x18

12x18+8x16

38

2

61

ROS85-254

270

10 5/8

12x19

20x18+8x16

38

2

66

ROS85-270

279

11

12x19

20x18+9x16

38

3

71

ROS85-279



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