BT-EM(DIN 1835 FORM B) : DIN6359 / DIN 1835 form B weldon end mill holders with BT MAS-403 form AD taper shanks
IT_N5                                               IT_SURFACE HARDNESS 58~60HRC                        IT_RUN-OUT A0.005                                   IT_TAPER SHANK GRADE                               
  DesignationSSd2D1D2LL1L5GkgGICATGIREMgiic
  BT40 EM 25X105 4025.0065.0061.00105.0078.068.00M162.634601602 0
  BT50 EM 25X115 5025.0065.00-115.0077.0-M245.294601612 0

Add B for coolant through flange