DCT (M8-M24) :  CHAMDRILL indexable head drills with chamfering insert, mainly for pre-thread holes.  
 
 
Chamfering   Drilling   COOLANT 
  Designation D
minDo not mount smaller drilling heads than specified range for drill body.
D
max

DnominalPre-thread hole diameter.

D2

d

L

L1

L4

L5
Po.
Size

ThUsed for standard thread size.
  DCT 210-048-25B-M24  21.00  21.99  21.00  25.50  25.00  48.0  69.0  56.0  50.20  21.0  M24

Hole tolerance: D+0.05 in average conditions. However, it can be higher or lower according to machine and tooling conditions.
Dnominal is the pre-thread hole dia.
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