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High Air Pressure Dth Hammer Drill Bits High Performance For Mining Rock

China Sinotechdrill International Co., Ltd certification
China Sinotechdrill International Co., Ltd certification
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High Air Pressure Dth Hammer Drill Bits High Performance For Mining Rock

Detailed Product Description
Model Number: 3.5", 4", 5", 6", 8",10", 12" Use: Ore Mining
Advantage: High Performance Item: Mining Rock Drill Tool Bit
Material: Carbon Steel Application: Ore
Hole Size: 90 Mm To 254 Mm Processing Type: Forging
High Light:

blast hole drill rig


blast hole drilling machine

High Air Pressure Deep Hole Rotary Pneumatic Drilling DTH hammer without foot valve



The optimum range of hole size for blast hole drilling with DTH is 90 mm to 254 mm (3 ½”–10″). Smaller blast holes are generally drilled using top hammer, and larger holes generally use rotary machines.


In other applications, like foundation drilling, DTH hammers can be used with single bit in hole sizes up to.750 mm (30″). With multiple hammer units CD (Cluster drills) drill holes up to 70″ or 1778 mm.

As a rule of thumb, the smallest hole diameter a DTH hammer can drill is its nominal size. A 4 inch hammer will drill a 4 inch (102 mm) hole. The limiting factor is the outside diameter of the hammer, because, as hole diameter reduces, airflow is restricted. Maximum hole size for production drilling is the nominal hammer size plus 1 inch, so for a 4 inch hammer the maximum hole size is 5 inch (127–130 mm).


Choosing the right hammer is largely determined by hole size and type of rock formation. Ideally, the size of the hammer should match the required hole dimension as closely as possible, leaving just enough space for cuttings to evacuate the hole.

4" hammer size
110-135mm connection thread
Top Sub 6.50kg
"O"Ring of Top Sub 0.01kg
Check Valve 0.42kg
Spring 0.04kg
Compression Buffer 0.04kg
Air Distributor 2.20kg
Internal Cylinder 2.30kg
Piston 9.00kg
External Cylinder 15.00kg
"O"Ring of Stop Ring 0.01kg
Stop Ring 0.20kg
Drive Chuck 3.50kg
Drill Bit  

High Air Pressure Dth Hammer Drill Bits High Performance For Mining Rock 0


1.It works with valve-free gas distribution, so it can distribute gas reliably.

2.The piston is simple in construction and is not easily damaged.

3.Fast drilling speed, low gas consumption and low fuel consumption.

4.Less components used, the structure is simple, and the each parts are hardened, so the working life is long.The convenient maintenance with less breakdown.

5.The joint and the card sleeve are connected with the outer cylinder by a multi-start thread, which is easy to disassemble.

6" hammer size
155-190mm connection thread
Top Sub 20.00kg
"O"Ring of Top Sub 0.02kg
Check Valve 1.00kg
Spring 0.10kg
Compression Buffer 0.10kg
Air Distributor 6.00kg
Internal Cylinder 5.00kg
Piston 23.50kg
External Cylinder 31.00kg
"O"Ring of Stop Ring 0.02kg
Stop Ring 0.60kg
Drive Chuck 5.40kg
Drill Bit  

According to your requirement, the top sub can be made into two spanners, and put protection buttons.An air controlling hole can be drilled on the check valve to provide more efficiency cuttings discharge.

High Air Pressure Dth Hammer Drill Bits High Performance For Mining Rock 1

If you are interested in our products, feel free to contact us.

Sinotechdrill International Co., Ltd
A3-1 building, Hanyu Gold Valley, High-tech Zone
North Road, Jinan City, Shandong Province, China
Tel: 0086-531-58190127


Contact Details
Sinotechdrill International Co., Ltd

Contact Person: Mr. Liu

Tel: 0086-18612948866

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