DR-4D-N :  DR-TWIST indexable square insert drills with coolant holes. Drilling depth 4xD.  
 
 
Drilling   COOLANT 
  Designation
D		 D
maxBy shifting drill center along lathe X-axis.
L
L1
L4
d
D3
Th
  DR180-072-25-06-4D-N  18.00  20.30  72.0  92.0  56.0  25.00  32.00  G3/8"
  DR185-074-25-06-4D-N  18.50  20.50  74.0  94.0  56.0  25.00  32.00  G3/8"
  DR190-076-25-06-4D-N  19.00  20.80  76.0  96.0  56.0  25.00  32.00  G3/8"
  DR195-078-25-06-4D-N  19.50  21.00  78.0  98.0  56.0  25.00  32.00  G3/8"
  DR200-080-25-06-4D-N  20.00  21.30  80.0  100.0  56.0  25.00  32.00  G3/8"
  DR205-082-25-06-4D-N  20.50  21.60  82.0  102.0  56.0  25.00  32.00  G3/8"
  DR210-084-25-07-4D-N  21.00  24.50  84.0  104.0  56.0  25.00  32.00  G3/8"
  DR215-086-25-07-4D-N  21.50  24.70  86.0  106.0  56.0  25.00  32.00  G3/8"
  DR220-088-25-07-4D-N  22.00  25.00  88.0  108.0  56.0  25.00  32.00  G3/8"
  DR225-090-25-07-4D-N  22.50  25.20  90.0  110.0  56.0  25.00  32.00  G3/8"
  DR230-092-25-07-4D-N  23.00  25.50  92.0  112.0  56.0  25.00  32.00  G3/8"
  DR235-094-25-07-4D-N  23.50  25.70  94.0  114.0  56.0  25.00  32.00  G3/8"
  DR240-096-25-07-4D-N  24.00  26.00  96.0  116.0  56.0  25.00  32.00  G3/8"

Hole tolerance D+0.35/-0.05 in average conditions. However it can be higher or lower according to machine and tooling conditions.
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