OUTE ROCK TOOLS

Bit classification code

Issuing time:2019-10-12 12:24

Bit classification code

H:Very hard to hard rock> 2500 bar (250 MPa)

M:Medium hard rock..1500-2500 bar (150-250 MPa)

S:Soft rock< 1500 bar (150 MPa)


C:Homogeneous (competent) rock

  F:Fissured rock


V:Very abrasive rock> 40% silica

A:Abrasive rock..20-40% silica

N:Non-abrasive rock..0-20% silica


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