THIS ACCUPRO BT40 1”-1.75” CAT 40 SHELL MILL HOLDER FEATURES A BT40 TAPER SIZE WITH A PROJECTION LENGTH FROM THE FLANGE TO THE NOSE END OF 1.7500 INCHES. IT HAS A PILOT DIAMETER OF 1.0000 INCHES AND A NOSE DIAMETER OF 2.3800 INCHES. THE HOLDER SUPPORTS THROUGH-COOLANT OPERATION, WITH A COOLANT TYPE SPECIFIED AS THROUGH-SPINDLE & DIN FLANGE. THE TIR (TOTAL INDICATOR RUNOUT) IS 0.000200 INCHES. THE LOCK SCREW THREAD SIZE IS 1/2-20, AND THE COMPATIBLE SHELL MILL CUTTING DIAMETER RANGE IS 2-1/4 TO 2-3/4 INCHES.