BS ISO 3338-2:2013

Describes the dimensions of flatted cylindrical shanks for milling cutters, of diameters 6 mm to 20 mm for single-flatted shanks, of 25 mm to 63 mm for double-flatted shanks and of 6 mm to 32 mm for shank with inclined clamping surface.

This part of ISO3338 specifies the dimensions of flatted cylindrical shanks for milling cutters, of diameters 6mm to 20mm for single-flatted shanks, of 25mm to 63mm for double-flatted shanks and of 6mm to 32mm for shank with inclined clamping surface. In the case of single-flatted shanks, it is applicable to both single-ended cutters and double-ended cutters, as double-flatted shanks cannot admit single-ended cutters.

The dimensions of plain cylindrical shanks and threaded shanks are given in ISO3338-1 and ISO3338-3, respectively.

The two shank types covered by ISO3338-1 and this part of ISO3338 have the same dimensional characteristics (diameters and lengths), but different tolerances on diameters, namely:

• h8 for plain cylindrical shanks, commonly used for tools mounted in collets;

• h6 for flatted cylindrical shanks, intended to be mounted in chucks and secured with a clamping screw, and requiring an accuracy adjustment.