scope:

Gives details for the manufacture and use of gauges for checking ISO general-purpose metric screw threads with a basic profile in accordance with ISO 68. It specifies the features of the types of gauges (listed in 4.1 and 4.2) which are recomended for checking external and internal screw threads of workpieces and for the setting and checking of certain of the screw gauges. It is recognized that other methods of checking may be used, for example measurements with indicating instruments. Checking with gauges in accordance with this International Standard is always decisive.