DR-2D-N :  DR-TWIST indexable square insert drills with coolant holes. Drilling depth 2xD.  
 
 
Drilling   COOLANT 
  Designation
D		 D
maxBy shifting drill center along lathe X-axis.
L
L1
L4
d
D3
Th
  DR180-036-25-06-2D-N  18.00  20.30  36.0  56.0  56.0  25.00  32.00  G3/8"
  DR185-037-25-06-2D-N  18.50  20.50  37.0  57.0  56.0  25.00  32.00  G3/8"
  DR190-038-25-06-2D-N  19.00  20.80  38.0  58.0  56.0  25.00  32.00  G3/8"
  DR195-039-25-06-2D-N  19.50  21.00  39.0  59.0  56.0  25.00  32.00  G3/8"
  DR200-040-25-06-2D-N  20.00  21.30  40.0  60.0  56.0  25.00  32.00  G3/8"
  DR205-041-25-06-2D-N  20.50  21.60  41.0  61.0  56.0  25.00  32.00  G3/8"
  DR210-042-25-07-2D-N  21.00  24.50  42.0  62.0  56.0  25.00  32.00  G3/8"
  DR215-043-25-07-2D-N  21.50  24.70  43.0  63.0  56.0  25.00  32.00  G3/8"
  DR220-044-25-07-2D-N  22.00  25.00  44.0  64.0  56.0  25.00  32.00  G3/8"
  DR225-045-25-07-2D-N  22.50  25.20  45.0  65.0  56.0  25.00  32.00  G3/8"
  DR230-046-25-07-2D-N  23.00  25.50  46.0  66.0  56.0  25.00  32.00  G3/8"
  DR235-047-25-07-2D-N  23.50  25.70  47.0  67.0  56.0  25.00  32.00  G3/8"
  DR240-048-25-07-2D-N  24.00  26.00  48.0  68.0  56.0  25.00  32.00  G3/8"

Hole tolerance D+0.15/-0.05 in average conditions. However it can be higher or lower according to machine and tooling conditions.
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