QL Series DTH Button Bit

​DTH Bits are Mainly used for Quarrying, Ore Mining, Coal Mining, soft, medium hard, and hard rock, blast hole drilling and water well drilling project, Marble quarry or well drilling and other construction projects....

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GMD could supply lots of grades DTH Bits, they can be chosen according to different applications. Both soft, medium-hard, and hard rocks, Our DTH Bit could have a good performance.


The Advantage of Our DTH Button Bit

1. Smooth performance and long service life of DTH bits due to high quality alloy  steel materials and advanced processing technology adapted.

2. Low problem rate and easy to maintenance due to simple , reliable and easy  assemble and disassemble inner structure of DTH bits.

3. Interchangeable with DTH bit and dill pipe manufactured by Atlas copco and Ingersoll-rand.


Shank Type: QL40, QL50, QL60, QL80

Bit Diameter: 105mm-605mm

Bit Face: Flat Face, Convex Face, Concave Face, Drop Center, Double Gauge.




Details, kindly check below:



How to Choose right DTH Button Bit?



1. Flat Face Bit

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 an resistance to steel wash

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.

3. Concave Face

The all-round application bit face specifically for medium hard and homogenerous rock formations. Good hole deviation control and good flushing capacity.

4. Drop Center Bit

For high penetration rates in soft to medium hard and fissured rock formations. Low to medium air pressures. Maximum hole deviation control.

5. 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.


Button Shape Selection

Button Shape



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.


Ballistic Button: Ballistic buttons are   usually used as front buttons, suitable for medium abrasive and medium hard   formations. They can also be used as gauge buttons if the rock is soft.


Sharp Buttons: Sharp buttons are usually   used as front buttons  for soft   formations, suitable for high rotation speed and low bit broken rate soft   rock.



DTH Packing

Key Words:


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High Air Pressure COP Series DTH Bits for Hard Rock Drilling

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High Air Pressure DTH Button Bit

Large Diameter Button Bits

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