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DTH hammer 5inch

Choosing the right hammer is largely determined by hole size and type of rock formation. 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).

Quantity:
  • ROS-R5-Q
  • ROSCHEN
  • R5-Q

Product Description


 DTH hammer 5” 

Product description: 

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.


The ROSCHEN 5” hammer is designed around proven technology to perform at the top end of the performance scale compared to other tools on the market. These tools are excellent for all types of drilling applications including residential geothermal, production quarry drilling, seismic drilling and small construction drilling.


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).

 Key Features and Benefits

•Patented features maximize energy output and reduce service requirements.

•Fewer internal components minimize service requirements.

•Valueless, high frequency design ensures smooth operation.

•Hardened wear sleeve for optimum wear resistance even in the most abrasive conditions.

•Multi-start threads on back head and chuck ensure easy coupling/uncoupling of hammer.

•Unique internal mount system eliminates the need for wear shims and special assembly tools.

•All critical internal components are heat treated under strict control to maximize tool longevity.


Specifications

Metric

Imperial

Hammer Outside Diameter

124mm

4.88"

Hammer Length (Less Bit, Backhead Shoulder   to Chuck)

993mm

39.1"

Backhead Spanner Flat Size

89mm

3.5”

Drill Bit Shank Type


QL50

Minimum Bit Size

140mm

5.5"

Hammer Weight (Less Bit)

67.3Kgs

148Lbs

Drill Bit Weight (120mm/4 3/4")

17.7Kgs

39Lbs

Piston Weight

15.0Kgs

33.6Lbs

Backhead Stand Off

0.75mm

0.030”

Make up Torque

 5085-6780 NM

3750-5000 FT Lbs

Wear Sleeve Reverse Limit

116.1mm

4.570"

Wear Sleeve Discard Limit

111.8mm

4.400”

Recommended Minimum Air Package

283    l/s @ 17.2 Bar

600 cfm @ 250 psi

DTH hammer 5inch structure

DTH Hammer 5inch



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