BT-SEM :  ISO 3937 shell mill holders with BT MAS-403 AD tapered shanks.  
 
 
RUNOUT (EXT) 0.005MM (.0002 TAPER HARDNESS 58-60 SURFACE FINISH N5 COOLANT
  Designation
SS

d

D1

L

L2

L1

G

Kg
  BT30 SEM 16X 50  30  16.00  38.0  50.00  17.00  28.0  M12  0.62
  BT40 SEM 16X 60  40  16.00  38.0  60.00  17.00  33.0  M16  1.29
  BT40 SEM 16X120  40  16.00  38.0  120.00  17.00  93.0  M16  1.82
  BT50 SEM 16X 75  50  16.00  38.0  75.00  17.00  37.0  M24  3.86
  BT50 SEM 16X120  50  16.00  38.0  120.00  17.00  82.0  M24  4.40

Add B as suffix to the designation for coolant through flange.
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