DR-3XD (.625-1.375" 3xD) :    
 
 
Drilling  
  Designation
D

L

L1
D
max

d

D3

L4

cc
  DR1281-3843-125-3  0.00  0.0  0.0  0.00  0.00  0.00  0.0  NPT1/4

Hole diameter can be changed by shifting drill center along lathe X-axis.
Hole tolerance: D+.006/-.002 in average conditions. However, it can be higher or lower according to machine and tooling conditions.
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