DR-3D-N :  DR-TWIST indexable square insert drills with coolant holes. Drilling depth 3xD.  
 
 
Drilling   COOLANT 
  Designation
D		 D
maxBy shifting drill center along lathe X-axis.
L
L1
L4
d
D3
Th
  DR180-054-25-06-3D-N  18.00  20.30  54.0  74.0  56.0  25.00  32.00  G3/8"
  DR185-056-25-06-3D-N  18.50  20.50  55.5  75.5  56.0  25.00  32.00  G3/8"
  DR190-057-25-06-3D-N  19.00  20.80  57.0  77.0  56.0  25.00  32.00  G3/8"
  DR195-059-25-06-3D-N  19.50  21.00  58.5  78.5  56.0  25.00  32.00  G3/8"
  DR200-060-25-06-3D-N  20.00  21.30  60.0  80.0  56.0  25.00  32.00  G3/8"
  DR205-062-25-06-3D-N  20.50  21.60  61.5  81.5  56.0  25.00  32.00  G3/8"
  DR210-063-25-07-3D-N  21.00  24.50  63.0  83.0  56.0  25.00  32.00  G3/8"
  DR215-065-25-07-3D-N  21.50  24.70  64.5  84.5  56.0  25.00  32.00  G3/8"
  DR220-066-25-07-3D-N  22.00  25.00  66.0  86.0  56.0  25.00  32.00  G3/8"
  DR225-068-25-07-3D-N  22.50  25.20  67.5  87.5  56.0  25.00  32.00  G3/8"
  DR230-069-25-07-3D-N  23.00  25.50  69.0  89.0  56.0  25.00  32.00  G3/8"
  DR235-071-25-07-3D-N  23.50  25.70  70.5  90.5  56.0  25.00  32.00  G3/8"
  DR240-072-25-07-3D-N  24.00  26.00  72.0  92.0  56.0  25.00  32.00  G3/8"

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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