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
  BT40 SEM 40X 60  40  40.00  82.0  60.00  27.00  23.0  M16  2.25
  BT40 SEM 40X 75  40  40.00  82.0  75.00  27.00  38.0  M16  3.10
  BT50 SEM 40X 48  50  40.00  82.0  48.00  27.00  10.0  M24  4.27
  BT50 SEM 40X 75  50  40.00  82.0  75.00  27.00  37.0  M24  5.33

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