140mm Down The Hole Drilling Bits For Percussion Rotary Air Blast Drilling
1 - 5 pcs
140mm Down The Hole Drilling Bits For Percussion Rotary Air Blast Drilling
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Basic Infomation
Place of Origin: Germany
Brand Name: ROSCHEN
Certification: ISO
Model Number: 2 - 36"
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drill pipes


dth hammers and bits

Payment & Shipping Terms
Packaging Details: Poly Wooden box
Supply Ability: 100000 pcs
Name: Down The Hole Hammer Bits
Drilling: Down The Hole Hammer Drilling
Hammer: Rev Drill Down Hole Hammer
Sale: Down Hole Hammer For Sale
Hammer Bits: Down The Hole Hammer Bits
Brand: Puma Dth Hammers
Use: Down The Hole Drilling Method
Origin: China Down The Hole DTH Hammer Bits
Product Description

Down The Hole (DTH) Hammer Bits 140mm For Percussion Rotary Air Blast Drilling



DTH Hammer Bits

Roschen Hammer Bits or DTH Button Bits range in size from 2" hole diameter upwards (50.1mm) to 36” (914.4mm). Roschen always supply stocks DTH Hammers and DTH Button bits for all major DTH Hammer brands and shanks.

When percussion or hammer drilling your choice of hammer bit is just as important as your choice of down hole hammer. DTH stands for “down the hole”. When hammer drilling, the hammer bit gets its energy from repetitive striking of a pneumatic down hole hammers piston. This hammering with slow rotation drives the hammer bit gradually through ground formations. DTH hammer bits are most commonly used in percussion rotary air blast drilling, mining blast holes, and mineral exploration and water well drilling industries.

The cutting interface of the DTH hammer bits are loaded with high quality tungsten carbide, which is an extremely hard material. Since hammer bits work with air pressure delivered to the down hole hammer, it is important to use the recommended pressure provided when hammer drilling. Down hole hammer bits come with a wide variety of carbide styles. The sharper the point, the softer formation it is used for. The different styles of carbides on the hammer face include dome, cone and ballistic tungsten carbide inserts which are press fit into the DTH bit.

Roschen can open up the flushing holes to provide hammer bits that can be used in reverse circulation drilling. Customized Hammer Bits, Flat Faced Hammer Bits, Convex Hammer Bits, Drop Center Hammer Bits, Concave Hammer Bits, and all kinds of exceptional custom drilling tools are offered at Roschen group limited.


ROSCHEN DTH Bits Specifications
Hammer Size Bits diameter Shank ROSCHEN CODE
Metric Inch
1" 64mm-70mm 2 1/2"-2 3/4" BR1 ROS 11
2" 70mm-95mm 2 3/4"-3 3/4" MACH20/BR2 ROS 22
3" 90mm-102mm 3 1/2"-4" COP32/COP34/MACH303 ROS 32
M30/DHD3.5/BR3 ROS 34
4" 105mm-152mm 4 1/8"-6" COP44/DHD340/MACH44 ROS 42
SD4/M40/QL40 ROS 44
5" 133mm-165mm 5 1/4"-6 1/2" COP54/DHD350R/MACH50 ROS 52
SD5/M50/QL50/BR5 ROS 54
6" 152mm-254mm 4 1/8"-10" COP64/DHD360/SD6 ROS 62
M60/QL60/Bulroc BR6 ROS 64
8" 203mm-330mm 8"-13" COP84/DHD380/SD8 ROS 82
QL80/M80/M85 ROS 84
10" 254mm-380mm 10"-15" SD10 ROS 100
12" 305mm-508mm 12"-20" DHD1120/SD12 ROS 120
Metzke, Remet thread is available!
Any special size of DTH bits will be available by requests.



1. Using higher grade carbides for longer life;
2. Minimizes hole erosion in fragile formations
3. Drills faster through soft formations with less blockages
4. Drills straighter through consolidated and unconsolidated formations


DTH Hammer Bits key face types: 

140mm Down The Hole Drilling Bits For Percussion Rotary Air Blast Drilling 0

1. Flat Faced Hammer Bit 

These hammer bits are excellent for drilling in medium to hard formations. These hammer bits maintain average hole straightness but have an excellent penetration rate.

2. 140mm Down The Hole Drilling Bits For Percussion Rotary Air Blast Drilling 1

Medium to hard ground formations are no problem for this DTH Hammer Bit. The DTH bit keeps average hole straightness but drills at an excellent speed.


3. 140mm Down The Hole Drilling Bits For Percussion Rotary Air Blast Drilling 2
These DTH Hammer Bits are great for drilling through medium to hard formations. Drop Center Hammer Bits have excellent hole straightness with an average drilling rate of penetration.


4. Concave Type Hammer Bit140mm Down The Hole Drilling Bits For Percussion Rotary Air Blast Drilling 3

Concave Hammer bits are ideal for drilling through medium to hard formations. These DTH hammer bits are known to keep an extremely straight hole with an average rate of penetration.


For more information, please contact:




WeChat: +86-137 6419 5009 ; +86-135 8585 5390

WhatsApp: +86-137 6419 5009 ; +86-135 8585 5390

Email: roschen@roschen.com ; roschen@roschen.net

Website: http://www.roschen.com ; http://www.roschen.net

http://www.roschen.cn ; http://www.roschendrill.com

http://www.roschenmining.com ; http://www.roschendrilling.com

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Fax : 86-021-54380177
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