JSA JIS B 0420-1

Abstract

Scope: This Standard establishes the default specification operator for linear size and de-fines a number of special specification operators for linear size for feature of size types "cylinder" and "two parallel opposite planes". It. also defines the specification modifiers and the drawing indications for these linear sizes. This Standard 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 — indirect global linear size — calculated global size (calculated size with volume diameter) — calculated size — circumference diameter — area diameter — volume diameter — rank-order size — maximum size — minimum size — average size — median size — mid-range size — range size. This Standard defines tolerances of linear sizes when there is : — a + and/or — limit deviation (e.g. 01-0.019) (see Figure 9); — an upper limit of size (ULS) and/or lower limit of size (LLS) (e.g. 11.a.max..12.min) (see Figure II); — an ISO tolerance class code in accordance with JIS B 0401-1 (see Figure 10). with or without modifier (see Tables 1 and 2). This Standard 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. NOTE : The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows. ISO 14405-1 : 2010 Geometrical product specifications (GPS) — Dimensional tolerancing — Part 1 Linear sizes (MOD) In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and .JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/1EC Guide 21-1.