ROTATING TOOL INSERTS IDENTIFICATION y ISO CODES FOR MILLING Symbol Relief Angle AN Symbol Insert Shape C 7° S Square D 15° T Triangular E 20° C Rhombic 80° F 25° N Regular Heptagon G 30° O Octagonal N 0° M Rhombic 86° P 11° A Parallelogram 85° R Round O Other X Special Design ─ X Other W Wiper ─ Major Relief Angle z Insert Shape x Relief Angle INCH METRIC c Tolerance Class v Chip Breaker With or Without Hole Metric IC Symbol Hole Hole Chip-ConfigurationbreakersFigureCylindrical IC S W With Hole Hole No + Class IC M SKA.500e.001e.0002e.001 OneTWith HoleCountersink(40° ─ 60°)Onesided C .250.375 e.001 e.0005 e.001.500E.625e.001e.001e.001 CylindricalUHoleWith Hole+CountersinkDoublesided(40° ─ 60°)Cylindrical H .394.492 e.0005 e.0005 e.001 HoleBWith Hole+OneNo G .551 e.001 e.001 e.005 Countersink(70° ─ 90°) .250 e.002 e.0005 e.001K.375e.002e.0005e.001.500e.003e.0005e.001NWithoutHole– NoRWithoutHole–Onesided .625 e.003 e.0005 e.001 .250 e.002 e.003 e.001 X – – – SpecialDesign N .375 e.002 e.003 e.001.500e.003e.006e.001 .625 e.004 e.006 e.001 .250 e.002 e.003 e.005 M .375 e.002 e.003 e.005.500e.003e.005e.005Note 1) Dimension symbols conforming to ISO13399.See pages P002-P005 for details. .625 e.004 e.006 e.005 K002 ROTATING TOOL INSERTS M M