Specifies: dimensions and tolerances of the interface features; port identification; identification of the result of operator actuation. Does not apply to the functional characteristics of interfaces. Figure 1 and table 1 include the sizes 1, 2 and 3; figure 2 and table 2 include the sizes 4, 5 and 6; figure 3 and table 3 include the form and location of interface features. The informative annex A contains the bibliography. This second edition cancels and replaces the first edition (1978).