BT MAS-403 Type A f1 Toolholder Standard No through coolant f3L1a L6 ”ADB” holders provide both “AD” 8° 17'50" and “B” type coolant flow options d3 G d6 d5 b L4 d1 d Type AD Central coolant hole Type B 20º Coolant through flange max. 35º d12 e1 e1 Type ADB Center coolant hole or coolant through flange Shank a b (H12) d d1 G d3 (H8) d5 d6 (H8) f1 ±0.1 BT 30 2 16.1 8 31.75 M12 12.5 56.144 46 13.6 BT 40 2 16.1 10 44.45 M16 17.0 75.679 63 16.6 BT 50 3 25.7 15 69.85 M24 25.0 119.020 100 23.2 Shank f3 L1 ±0.2 L4 MIN L6-0.2 e1 ±0.1 d12 Taper AT3 BT 30 20 48.4 24 16.3 21 4 0.002 BT 40 25 65.4 30 22.6 27 4 0.003 BT 50 35 101.8 45 35.4 42 6 0.004 628 ISCAR