® CMT Vertical Milling Acme Inserts for internal thread CuttingDDiameter InsertType Ordering Code PitchTPI Standard D Holder Code* C18 C18 I 5 ACME 5 11/8, 11/4 18.0 H5.1, 5.2, 21 C25 C25 I 4 ACME 4 11/2, 13/4, 2 25.0 H10, 11, 24, 25 Round-DIN 405 Inserts for internal thread CuttingDDiameter InsertType Ordering Code PitchTPI Standard D Holder Code* C18 C18 1/8RD 8 1/8RD 17.8 H5.1, 5.2, 6, 7, 8, 9, 21,22, 23 C18 1/6RD 6 1/6RD 17.8 H5.1, 5.2, 21 C25 C25 1/4RD 4 1/4RD 25.0 H10, 11, 24, 25 * For complete toolholder description see pages B07-22 and 23 B07-13