BT-SEM :  ISO 3937 shell mill holders with BT MAS-403 AD tapered shanks.  
 
 
RUNOUT (EXTERNAL) 0.005  TAPER  HARDNESS 58-60  SURFACE FINISH N5 
COOLANT 
  Designation
SS
d
D1
L
L2
L1
G
Kg
  BT30 SEM 27X 50  30  27.00  58.0  50.00  21.00  18.0  M12  0.88
  BT40 SEM 27X 45  40  27.00  58.0  45.00  21.00  18.0  M16  1.39
  BT40 SEM 27X105  40  27.00  58.0  105.00  21.00  78.0  M16  2.63
  BT50 SEM 27X 60  50  27.00  58.0  60.00  21.00  22.0  M24  4.15
  BT50 SEM 27X105  50  27.00  58.0  105.00  21.00  67.0  M24  5.08

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