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DTH hammer

  • High Pressure DTH Hammers
  • High Pressure DTH Hammers
High Pressure DTH HammersHigh Pressure DTH Hammers

High Pressure DTH Hammers

  • Hammer Size: from 3
  • Shank types:COP, QL,DHD, MISSION,HD,IR, SD,TD,CIR,BR
  • Connect Thread :API 2 3/8
  • Use: Ore Mining
  • Product description: High pressure ­­(7~ 30 bars).
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Superdrill DTH hammers are all simple structure, easy to assemble and disassemble, as well as reliable quality and long service life. Superdrill has various hammer models suitable to drill holes from 64mm to 1000 mm (2-1/2” ~ 39-3/8”) in diameter; and come with three kind: low pressure (5 ~ 7 bars), middle pressure (7 ~ 15 bar) and high pressure ­­(7~ 30 bars).

Superdrill  DTH hammers mainly be produced with shank type of DHD, QL, SF, COP, Mission, SD, BR, CIR and ACD series, Diameter ranging from 2” to 8” for mining and quarrying, and 6” to 32” for      water-well drilling, oil-well drilling and foundation and so on.

DTH Hammer Selection:

Choosing the right hammer is largely determined by drill machines (mainly compressor output), drilling 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 compressed air to flush cuttings and clean the hole.

The optimum range of hole size for blast-hole drilling with DTH method is 90~254 mm (3-1/2” ~ 10”) with 3.5 ~ 8” hammers. Smaller blast holes are generally drilled with top-hammer tools, while larger holes typically with rotary drilling tools. In other applications, like foundation drilling, DTH hammers can be used in hole size up to 1,000 mm (39-3/8”).

Usually, the smallest hole diameter a DTH hammer can drill is its nominal size, for example, a 4” hammer would drill a 4” (100/102 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”for 5” and smaller hammers and plus 2 for 6” and bigger hammers, for example, for a 4” hammer the maximum hole size is 5” (127/130mm) while for a 8” hammer the maximum hole size is 10” (254mm).

High Pressure DTH Hammers:

Hammer Size Shank Design Working Pressure Drilling Range
Bar(0.1 MPa) PSI (lb/in2) mm inch
2.5” SPD2.5 10~15 150~220 76~90 3 ~ 3 1/2
3.5” DHD3.5 10~15 150~220 90~115 3 1/2 ~ 4 1/2
Mission30 10~24 150~350 90~105 3 1/2 ~ 4 1/8
4” DHD340A 10~24 150~350 108~135 4 1/4 ~ 5 3/8
Mission40 10~24 150~350 108~135 4 1/4 ~ 5 3/8
SD4 10~24 150~350 110~135 4 3/8 ~ 5 3/8
QL40 10~24 150~350 110~135 4 3/8 ~ 5 3/8
5” DHD350R 10~25 150~360 127~155 5 ~ 6 1/8
Mission50 10~25 150~360 135~155 5 1/4 ~ 6 1/8
SD5 10~25 150~360 135~155 5 1/4 ~ 6 1/8
QL50 10~25 150~360 135~155 5 1/4 ~ 6 1/8
6” DHD360 10~25 150~360 152~254 6 ~ 10
Mission60 13~25 190~360 152~254 6 ~ 10
SD6 10~25 150~360 155~203 6 1/8 ~ 8
QL60 15~25 220~360 155~203 6 1/8 ~ 8
DHD360 18~30 260~440 175~216 6 7/8 ~ 8 1/2
8” DHD380 10~30 150~440 195~305 7 3/4 ~ 12
Mission80 10~25 150~360 195~305 7 3/4 ~ 12
SD8 15~25 220~360 195~254 7 3/4 ~ 10
QL80 18~30 260~440 195~254 7 3/4 ~ 10
QL80 18~30 260~440 216~254 8 1/2 ~ 10
10” SD10 15~30 220~440 240~311 9 1/2 ~ 12 1/4
NUMA100 15~30 220~440 254~311 10 ~ 12 1/4
12” DHD112 18~30 260~440 305~445 12 ~ 17 1/2
SD12 18~30 260~440 311~445 12 1/4 ~ 17 1/2
QL120 17~24 250~350 305~445 12 ~ 17 1/2
NUMA120 18~35 260~510 305~445 12 ~ 17 1/2
NUMA125 18~35 260~510 305~445 12 ~ 17 1/2


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