scope:

This Standard specifies the characteristics of three sizes of reels for 12,7 mm (0,5 in) wide magnetic tape to allow physical interchangeability of such reels. The sizes are size 16, size 18, size 22. Their dimensions differ only in the overall diameter of their flanges. All other requirements of this Standard apply equally to all three sizes. All requirements refer to empty reels, except for 8,2 which refers to full reels. Reels specified in this Standard are intended for applications where the larger reel (size 27) specified in ISO 1864 is not used. Reels complying with this Standard cannot be used with the self-loading cartridge specified in ISO 6098.