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94-120 PDC Coreless Drill Bits
94-120 PDC Coreless Drill Bits

94-120 PDC Coreless Drill Bits

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Preferred reference table for diamond composite drill bits

Rock Hardness category Soft Medium-soft Medium Medium-hard Hard Hard Hardest
Drillability level 1 2 3 4 5 6 7 8 9 10 11 12
Praetz hardness F≤10 10 < F≤1515 < F≤20
Representative rocks Sandstone, limestone, marble, dolomite, pyrite, weak granite, shale Granite, strong sandstone, conglomerate, limestone, quartz veins Strong granite, quartzite, basalt, igneous rock
PDC core drill bits Ordinary type
  ♦ ♦ ♦ ♦ ♦ ♦ ♦


Reinforced type
  ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦

High-strength type
  ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦
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