ISO identification  ISO identification Symbol Shape W No chipbreaker, with hole T Single-sided chipbreaker, with hole Symbol Shape F H Hexagon Double-sided O Octagon chipbreakers, without hole Symbol Shape P Pentagon S Square Symbol Tolerance (mm) T Triangle (Class) Corner Height Thickness I.C. Size N FNo chipbreaker, C 80˚ RhombicD55˚ Rhombic AF ±0.005 ±0.025±0.013 without hole Sharp edge E 75˚ RhombicF50˚ Rhombic Symbol Relief angle CH ±0.013 ±0.025 ±0.025±0.013 R E M 86˚ RhombicV35˚ Rhombic A 3°B5° EG ±0.025 ±0.13 ±0.025 Single-sided chipbreaker,without hole R-honed W TrigonLRectangleA85˚ ParallelogramB82˚ ParallelogramK55˚ ParallelogramRRoundShown angle stands foracute angle for rhombic andparallelogram inserts.C7°J±0.005D15°K*±0.013±0.025M TE20°L*±0.025±0.05~±0.15F25°G30°M*N*±0.08~±0.18±0.13±0.025Single-sided chipbreaker,with holeChamferedN0°P11°U*±0.13~±0.38±0.13±0.08~±0.25Insert's periphery is as fired.ASOOther angles* Tolerance difference is depending on insert size.No chipbreaker, with holeChamfered + R-honed Shape Relief angle Tolerance Chipbreaker / Hole Edge preparation S E K N 12 03 A F T N - M Edge length Tickness Cutting edge angle Relief angle Hand of tool Manufacturer’s option Symbol Thickness (mm) Symbol Cutting edge angle Symbol Relief angle Symbol Hand of tool Chipbreaker, etc. 02 2.38 A 45° A 3° R Right-hand 03 3.18 D 60° B 5° L Left-hand T3 3.97 E 75° C 7° N Neutral 04 4.76 F 85° D 15° 05 5.56 H 87° E 20° 06 6.35 P 90° F 25° X 65° G 30° N 0° P 11° R 10° S 14° T 22° U 23° In case of indicating corner-R(RE) Corner-R (RE) (mm) 04 0.4 08 0.8 12 1.2 16 1.6 20 2.0 M9 Milling