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Down-The-Hole ( DTH ) Bits Summary

Down-The-Hole ( DTH ) Bits Summary

Down-The-Hole ( DTH ) Bits Summary

Product details

Down-The-Hole ( DTH ) Bits Summary 


Down-the-hole (DTH) bits are used with Down-the-hole hammers for drilling holes through a wide range of rock types. In conjunction with DTH hammers, drill hammer bits are designed with a splined drive for rotating the bit in the ground. Drill bits are available in different sizes and different styles so they can drill a wide range of hole sizes.


Our variety of Down the Hole drill bits are manufactured using the following high quality materials to provide you with a fine balance between penetration capability and bit life.   

(1) Skirt body alloy steel use imported TIMKEN, USA 

(2) Cemented carbide grade T6 from Element Six Group working for Boart Longyear. 


We offer a comprehensive range of standard and made to order drill bits on an extensive selection of shanks with a wide variety of head designs to suit every project.


Our DTH bits are interchangeable with these famous bits with CIR, Bulroc, Mach, DHD, COP/QLSD/Mission, NUMAetc. series shank.

ProDrill DTH bits are made of superior quality alloy steel which is made by Timken in U.S. Besides, all our DTH bits are using the brand "Element Six" T.C carbide which provides (the T.C buttons) from Boart Long year. In addition art manufacturing technology makes our DTH bits with higher and more reliable quality.


DTH Bits



DTH Bit mounted on DTH hammer

Bit mounted into hammer at work site. 


Bit Face Shape Selection:

1. Drop Center Bit

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

2. Concave Face

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

3. Convex Face

A classic design for soft to medium hard rock formation which is not so abrasive. This design have very excellent penetration rate but poor in hole deviation if rocks are hard.

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.

4. Flat Face Bit

This is an universal design, especially for hard and abrasive rock formation. So typically, flat face with hemispherical buttons design is the most popular choice.

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

5. DGR face

A special design for hard or very hard rock conditions, double gauge row buttons provide very excellent ware-resistance and very longer life time. It is usually used for some bigger diameter DTH bits.


Carbide Button Shape Selection:

1. Semi-Ballistic Button

2. Ballistic Button

3. Spherical Button

4. Two-step Button


Besides, we are manufacturing the DTH bits with various shanks so they can be compatible with different DTH hammers

Bit face shape & button shape selection

Bit face shape & Button shape selection


DTH Bit with dome buttons, convex face

DTH button bit face, bit shape dome, convex face type. 


DTH Bit and hammers on water well drilling machine

Water well drilling machine, use DTH bit and hammers DHD360-165mm, photo taken in Changsha, Hunan

province, China. 


DTH Bit and hammers on water well drilling machine

Water well drilling machine with XRHS 836 jumpo Atlas Copco, photo taken in Wei fang city, Shan Dong 

Province, China. 


DTH Bit with DHD360 shank, diameter 152mm

Dia.152 mm  DTH bits with shank of DHD360 . 


DHD shank DTH Bits selection

DTH Bits with DHD shank selection

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