First two letters of IADC Code

1 2 3 for Milled Tooth, 4 5 6 7 8 for Tungsten Carbide Bit (Increasing hardness)

1 2 3 4 increasing hardness

 

Bit Diameter in mm

 

Bearing Type

  1. FB - Friction Bearing
  2. RB - Roller Bearing
 

Nozzle Type

  1. JN Jet Nozzle
  2. CN Center Jet Nozzle
  3. CX Combines
 

Leg Variation

  1. SH Standard Shirttail Hardfacing
  2. EH Extended Shirttail Hardfacing
  3. IS Inserts come Standard Shirttail Hardfacing
  4. IE Inserts come Extended Shirttail Hardfacing
 

Cone Variations

  1. A - Chisel inserts
  2. B - Conical inserts
  3. C - Spherical inserts
  4. D - Special inserts
  5. M - Mill tooth
  6. X - No gauge inserts
  7. Y - Single gauge inserts
  8. Z - Double gauge inserts

MT63

250.8

RB

JN

IE

AY

 

blasthole bits