DDD-EF :  Deep double tube drills with external 4 start thread for fast feed. Each item represents a diameter range. For a specific head diameter, an order form should be filled out.  
 
 
DEEPDRILL Drilling COOLANT
  Designation D
min
D
max

L

d

T

TsOuter tube designation

TsiInner tube designation
  DDD-EF 30.00-31.00  30.00  31.00  70.00  25.50  24.0  TDO-I5  TDI-N5
  DDD-EF 31.01-33.30  31.01  33.30  70.00  28.00  26.0  TDO-I6  TDI-N6
  DDD-EF 33.31-36.20  33.31  36.20  80.00  30.00  28.0  TDO-I7  TDI-N7
  DDD-EF 36.21-39.60  36.21  39.60  80.00  33.00  30.0  TDO-I8  TDI-N8
  DDD-EF 39.61-43.00  39.61  43.00  95.00  36.00  32.0  TDO-I9  TDI-N9
  DDD-EF 43.01-47.00  43.01  47.00  90.00  39.00  36.0  TDO-I10  TDI-N10
  DDD-EF 47.01-51.70  47.01  51.70  100.00  43.00  38.0  TDO-I11  TDI-N11
  DDD-EF 51.71-56.20  51.71  56.20  100.00  47.00  46.0  TDO-I12  TDI-N12
  DDD-EF 56.21-60.60  56.21  60.60  100.00  51.00  50.0  TDO-I13  TDI-N13
  DDD-EF 60.60-65.00  60.60  65.00  100.00  51.00  54.0  TDO-I13  TDI-N13

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