DR-3D-N :  DR-TWIST indexable square insert drills with coolant holes. Drilling depth 3xD.  
 
 
Drilling COOLANT
  Designation
D		 D
maxBy shifting the drill center along the lathe X-axis, or by using eccenter sleeves in drill rotating applications.
L
L1
L4
d
D3
Th
  DR120-036-16-04-3D-N  12.00  12.40  36.0  54.0  48.0  16.00  20.00  -
  DR125-038-16-04-3D-N  12.50  12.90  38.0  55.5  48.0  16.00  20.00  -
  DR130-039-16-04-3D-N  13.00  13.40  39.0  57.0  48.0  16.00  20.00  -
  DR135-041-16-04-3D-N  13.50  13.90  41.0  58.5  48.0  16.00  20.00  -

Hole tolerance D+0.25/-0.05 in average conditions. However it can be higher or lower according to machine and tooling conditions.
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