ISO NAMENCLATURE FOR EXTERNAL TOOLHOLDER C c 90° 7 A 75° 7 B 90° 7 C 45° 7 D 60° 7 E C _ 90° 7 F 90° 7 G / H L93° 7 J i 75° 7 K 95° 7 L < 50° J> 7 M 7 N uE 7 R 7 S 7 T 93° 7 U C72,5° 7 V 60° / W 85° / Y 80°, L C Top Clamping / 7 ^ K M 107.5° 90 ° L Top and hole clamping R P s J= B 5° C 7° D 15 E 20 j\\ N 0° p 11 S - Hole clamping T L> s L> 5 a Screrw on w A , O S C Clamping Method 65 Insert shape L Style & lead angle llw C R Clearance angle Cutting Direction