
Dimensions of widths across flats
出版:Japanese Standards Association

專家解讀視頻
This Japanese Industrial Standard specifies the dimensions of widths across flats applied to threaded fasteners and spanners and the dimensions of widths across flats corresponding to the thread nominal diameters of hexagon head bolts, hexagon nuts, hexagon socket set screws, and hexagon socket head cap screws.
ISO 272:1982 - Equivalent