Развертки машинные с цилиндрическим хвостовиком или коническим хвостовиком Морзе
Название (англ.):
Machine chucking reamers with parallel shanks or Morse taper shanks
Описание (англ.):
Lays down only metric dimensions. For each type of reamer mentioned above ISO 521 gives two tables, one showing preferred sizes with corresponding dimensions and the other, a general table set out as functions of diameter steps. Provision is also made for tolerances on length, cutting diameters and the diameters of parallel shank.