ISO 286-1-2010 pdf free.Geometrical product specifications (GPS)- ISO code system for tolerances on linear sizes一 Part 1: Basis of tolerances, deviations and fits.
This part of ISO 286 establishes the ISO code system for tolerances to be used for linear sizes of features of the following types:
a) cylinder;
b) two parallel opposite surfaces.
It defines the basic concepts and the related terminology for this code system. It provides a standardized selection of tolerance classes for general purposes from amongst the numerous possibilities.
Additionally, it defines the basic terminology for fits between two features of size without constraints of orientation and location and explains the principles of basic hole” and “basic shaft”.
2 Normative references
The following referenced documents are indispensable for the application of this document, For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 28621), Geometrical product specifications (GPS) — /SO code system for tolerances on linear sizes — Part 2; Tab/es of standard tolerance grades and limit deviations for holes and shafts
ISO 14405-1, Geometrical product specifications (GPS) — Dimensional tolerancing — Part 1: Linear sizes
ISO 14660-1:1999, Geometrical Product Specifications (GPS) — Geometrical features — Part 1: General terms and definitions
ISO 14660-2:1999, Geometrical Product Specifications (GPS) — Geometrical features — Part 2: Extracted median line of a cylinder and a cone, extracted median surface, local size of an extracted feature
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14405-1 and ISO 14660-1 and the following apply. It should be noted, however, that some of the terms are defined in a more restricted sense than in common usage.
3.1 Basic terminology
feature of size
geometrical shape defined by a linear or angular dimension which is a size
[ISO 14660-1:1999, definition 2.21
NOTE 1 The feature of size can be a cylinder, a sphere, two parallel opposite surfaces.
NOTE 2 In former editions of international standards, such as ISO 286-1 and ISOIR 1938, the meanings of the terms plain workpiece” and “single features” are close to that of leature of size”.
NOTE 3 For the purpose of ISO 286, only features of size type cylinder as well as type-two parallel opposite surfaces, defined by a linear dimension, apply.
3.1.2 nominal Integral feature theoretically exact integral feature as defined by a technical drawing or by other means
[ISO 14660-1:1999, definition 2.3]
3.1.3 hole internal feature of size of a workpiece. including internal features of size which are not cylindrical
NOTE See also Introduction.
3.1.4 basic hole hole chosen as a basis for a hole-basis fit system
NOTE 1 See also 3.4,1.1.
NOTE 2 For the purpose of the ISO code system, a basic hole is a hole for which the lower limit deviation is zero.
3.1.5 shaft external feature of size of a workpiece, including external features of size which are not cylindrical.ISO 286-1 pdf free download.