Full Description

ISO 14405-1:2016 establishes the default specification operator (see ISO 17450-2) for linear size and defines a number of special specification operators for linear size for features of size, e.g. cylinder, sphere, torus,[1], circle, two parallel opposite planes, or two parallel opposite straight lines.

It also defines the specification modifiers and the drawing indications for these linear sizes.

It covers the following linear sizes: local size: two-point size; spherical size; section size; portion size; global size: direct global linear size: least-squares size; maximum inscribed size; minimum circumscribed size; minimax size; indirect global linear size; calculated size: circumference diameter; area diameter; volume diameter; rank-order size: maximum size; minimum size; average size; median size; mid-range size; range of sizes; standard deviation of sizes.ISO 14405-1:2016 defines tolerances of linear sizes for the following: a + and/or limit deviation (e.g. 0/0,019); an upper limit of size (ULS) and/or lower limit of size (LLS) (e.g. 15,2 max., 12 min., or 30,2/30,181); an ISO tolerance class code in accordance with ISO 286-1 (e.g. 10 h6);with or without modifiers.

ISO 14405-1:2016 provides a set of tools to express several types of size characteristic. It does not present any information on the relationship between a function or a use and a size characteristic.

[1] A torus is a feature of size when its directrix diameter is fixed.