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R28 Thread Button Bit factory

#1
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
R28 Drill Bits for Drifting and Tunneling
Name Code No. Thread Diameter Gauge Front Skirt Design Weight
Threaded Button BitsQ7-36-R28R28365*8mm2*7mmStandard0.42
Q7-38-R28R28385*8mm2*8mmStandard0.48
Q7-41-R28R28415*9mm2*9mmStandard0.56
Q7-43-R28R28435*9.5mm2*8mmStandard0.68
Q7-45-R28R28455*10mm2*9mmStandard0.72
Q9-45-R28R28456*9mm3*8mmStandard0.72
Q9-48-R28R28486*9mm3*9mmStandard0.89
Q9-51-R28R28516*10mm3*9.5mmStandard0.97
Notes:
Special sizes may be available upon request.
How to order?
Button Bit: Diameter + Thread + Skirt Shape + Face Design + Insert Configuration
How to Choose the Right Button Shape
Button Shape and Application
Button ShapeApplication
Domed/Round Button
Domed/Round buttons are suitable for very abrasive and very hard formations.
Parabolic /Semi-Ballistic Button
Parabolic buttons are usually used as gauge buttons and front buttons, suitable for medium abrasive and hard formations.
Key Words:
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Button Drill Bit for for Drifting and TunnelingR28 Thread Button Bit factory
website:http://www.gmd-eqpt.com/thread-button-bit/r28-thread-button-bit/
 
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