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 068-021-14B-M8  6.80  7.49  6.80  13.90  14.00  21.0  41.9  45.0  24.70  6.8  M8
  DCT 085-026-14B-M10  8.30  8.99  8.50  14.00  14.00  26.0  46.5  45.0  28.90  8.0  M10
  DCT 102-030-14B-M12  10.00  10.99  10.20  14.00  14.00  30.0  52.0  45.0  32.10  10.0  M12
  DCT 120-035-16B-M14  12.00  12.99  12.00  16.00  16.00  35.0  58.0  48.0  37.20  12.0  M14
  DCT 140-039-18B-M16  14.00  14.99  14.00  18.00  18.00  39.0  60.0  48.0  41.50  14.0  M16
  DCT 175-042-20B-M20  17.30  17.99  17.50  21.00  20.00  42.0  63.0  50.0  43.40  17.0  M20
  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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