R28 Drill Bit for Drifting

R28 Drill Bits are made by high quality alloy steel bar and tungsten carbides.It is widely used in Drifting and Tunneling. GMD could design customized thread button drill bits according to different drilling application....

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GMD rock tools for top hammer drilling are designed to transmit intensive impact energy into the rock with the least possible loss of energy. The result is good rock breakage, high penetration rates and high productivity. This, together with optimal hole quality, great reliability and long service life, gives the best possible blasting results, outstanding drill-steel economy and low total cost.

GMD offers a complete selection of Top Hammer Drilling Tools to meet all of your drilling needs,which are suitable for any type of drilling application in mining, tunneling, construction and quarry work.


Specification of R28 Drill Bit, kindly check below:

A comprehensive range of various button bits shown as below:

Thread type: R28

Head diameters: 33mm ~ 76mm

Face designs; flat face,

Carbide shape: Dome, Ballistic , Semi-Ballistic,

Skirt designs: Standard

Application: Drifting and Tunneling


N--R25 Button Bit


N-R25 Button Bit-2


R28 Button bit, normal skirt

Diameter

Buttons

Flushing hole

Angle

Weight

mm

inch

Gauge x mm

Front x mm

Sild

Front

Gauge

kg

38

1 1/2

5x9

2x7

1

1

30°

0.52

38

1 1/2

4x9

2x8

2

1

30°

0.50


Notes:

Special sizes may be available upon request.


How to order?
Button Bit: Diameter   + Thread + Skirt Shape + Face Design + Insert Configuration


PACKING

R28 BUTTON BIT (2)


R28BUTTON BIT-2




How to Choose the Right Button Shape

Button Shape and Application

Button Shape

Application

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Domed/Round Button

Domed/Round buttons are suitable for very abrasive   and very hard formations.

image012.gif

Parabolic /Semi-Ballistic Button

Parabolic buttons are usually used as gauge buttons and front buttons, suitable for medium abrasive and hard formations.


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