EN 20286-2:1993/prA1

ISO system of limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts - Amendment 1 (ISO 286 2:1993/DAM 1:2008)

2009-07-22 EMA: This amendment will be incorporate into a new edition of EN ISO 286-2 (00290149).

Geometrische Produktspezifikation (GPS) - ISO-System für Grenzmaße und Passungen - Teil 2: Tabellen der Grundtoleranzgrade und Grenzabmaße für Bohrungen und Wellen - Änderung 1 (ISO 20286-2:1993/DAM 1:2008)

Système ISO de tolérances et d'ajustements - Partie 2: Tables des degrés de tolérance normalisés et des écarts limites des alésages et des arbres - Amendement 1 (ISO 286-2:1993/DAM 1:2008)

Sistem mejnih mer in ujemov ISO - 2. del: Preglednice standardnih toleranc in mejnih odstopkov za luknje in gredi - Dopolnilo 1 (ISO 286 2:1993/DAM 1:2008)

General Information

• Status: Not Published
• ICS: 17.040.10 - Limits and fits
• Technical Committee: CEN/TC 290 - Dimensional and geometrical product specification and verification
• Drafting Committee: ISO/TC 213 - ISO/TC 213
• Current Stage: 4098 - Decision to abandon - Enquiry
• Start Date: 20-Jul-2009
• Completion Date: 20-Jul-2009
• Ref Project: SIST EN 20286-2:2000/prA1:2008 - ISO system of limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts - Amendment 1 (ISO 286 2:1993/DAM 1:2008)

Relations

• Replaced By: EN ISO 286-2:2010 - Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts (ISO 286-2:2010)
• Effective Date: 19-Jun-2010
• Amends: EN 20286-2:1993 - ISO system of limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts (ISO 286-2:1988)
• Effective Date: 08-Jun-2022

Overview

The EN 20286-2:1993/prA1 standard, titled ISO system of limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts - Amendment 1 (ISO 286-2:1993/DAM 1:2008), is a key technical document issued by CEN (European Committee for Standardization). This amendment refines and updates the tables of standardized tolerance grades and corresponding limit deviations for holes and shafts, indispensable in precision engineering and manufacturing.

The document provides comprehensive tables and definitions to support the ISO system of limits and fits, enabling consistent dimensional control of cylindrical workpieces such as holes and shafts. It aligns with updates from ISO 286-1 regarding nominal sizes, replacing earlier references to basic sizes, and reflects improvements in dimensional and geometrical product specifications for industrial applications.

Key Topics

• Standard Tolerance Grades: Detailed tables with values for ISO tolerance grades IT01 to IT18, applicable to nominal sizes up to 3150 mm, including tolerance values expressed in micrometers (µm) and millimeters (mm).

• Limit Deviations for Holes and Shafts: Clear definitions of upper and lower limit deviations for holes (internal features) and shafts (external features), replacing previous terminology of “upper/lower deviations” with “upper/lower limit deviations” for enhanced precision.

• Nominal Size Reference: The amendment updates terminology, substituting “basic size” with the preferred term “nominal size” throughout the document for greater clarity and conformity with ISO 286-1.

• Application Scope: While the standards focus on cylindrical sections (common in holes and shafts), the tolerance and deviation principles can be applied to non-cylindrical workpieces, such as slots or keys, emphasizing versatility.

• Tables and Figures: The amendment revises and corrects numerous tables and figures illustrating tolerance intervals and limit deviations, including updated numerical values and removal of obsolete footnotes to streamline use.

• Normative References: Inclusion of related ISO standards such as ISO 1101 (geometrical tolerancing), ISO 1302 (surface texture indication), and ISO 2768 (general tolerances), to ensure comprehensive adherence to dimensional specifications.

Applications

This amendment and the underlying system provide critical guidance for design engineers, quality control specialists, and manufacturing professionals to:

• Ensure interchangeability and compatibility of mechanical components by defining permissible limits for size and fit between mating parts like holes and shafts.

• Facilitate consistent quality assurance in mass production by providing universally accepted tolerance grades and limits.

• Support precision machining and assembly processes by using standardized tolerance tables that reduce ambiguity and errors in dimensional specifications.

• Apply to multiple manufacturing sectors, including automotive, aerospace, mechanical engineering, and tooling industries where precision fits are essential for performance and safety.

• Adapt to various workpiece geometries, beyond circular sections, by applying tolerance concepts to slots, thicknesses, and other dimensional features.

Related Standards

To effectively implement the EN 20286-2:1993/prA1 amendment, users should refer to complementary and supporting standards in the Geometrical Product Specifications (GPS) family:

• ISO 286-1: Basis of tolerances, deviations, and fits - serves as the foundational document related to limits and fits.

• ISO 1101:2004: Geometrical tolerancing - specifies tolerances for form, orientation, location, and run-out.

• ISO 1302:2001: Surface texture indication - details methods for indicating surface finishes on technical drawings.

• ISO 2692:2006: Geometrical tolerancing - addresses maximum material requirement (MMR), least material requirement (LMR), and reciprocity requirements (RPR).

• ISO 2768-1:1989: General tolerances - provides default tolerance values for linear and angular dimensions when no specific tolerance is indicated.

By adhering to these international standards, organizations can ensure global interoperability, reduce manufacturing errors, and optimize dimensional accuracy in product development and production cycles.

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Keywords: ISO system of limits and fits, EN 20286-2:1993, standard tolerance grades, limit deviations, holes and shafts tolerances, nominal size, precision engineering standards, geometrical product specifications, tolerance tables, manufacturing quality control, CEN standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2008
Sistem mejnih mer in ujemov ISO - 2. del: Preglednice standardnih toleranc in
mejnih odstopkov za luknje in gredi - Dopolnilo 1 (ISO 286 2:1993/DAM 1:2008)
ISO system of limits and fits - Part 2: Tables of standard tolerance grades and limit
deviations for holes and shafts - Amendment 1 (ISO 286 2:1993/DAM 1:2008)
Système ISO de tolérances et d'ajustements - Partie 2: Tables des degrés de tolérance
normalisés et des écarts limites des alésages et des arbres - Amendement 1 (ISO 286-
2:1993/DAM 1:2008)
Ta slovenski standard je istoveten z: EN ISO 20286-2:1993/prA1
ICS:
17.040.10
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
EN 286-2:1993
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
January 2008
ICS 17.040.10
English Version
ISO system of limits and fits - Part 2: Tables of standard
tolerance grades and limit deviations for holes and shafts -
Amendment 1 (ISO 286 2:1993/DAM 1:2008)
Système ISO de tolérances et d'ajustements - Partie 2:
Tables des degrés de tolérance normalisés et des écarts
limites des alésages et des arbres - Amendement 1 (ISO
286-2:1993/DAM 1:2008)
This draft amendment is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee CEN/TC 290.

This draft amendment A1, if approved, will modify the European Standard EN 20286-2:1993. If this draft becomes an amendment, CEN
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this amendment
into the relevant national standard without any alteration.

This draft amendment was established by CEN in three official versions (English, French, German). A version in any other language made
by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 286-2:1993/prA1:2008: E
worldwide for CEN national Members.

EN ISO 286-2:1993/prA1:2008 (E)
Foreword
This document of (EN ISO 286-2:1993/prA1:2008) has been prepared by Technical Committee ISO/TC 213
“Dimensional and geometrical product specifications and verification” in collaboration with Technical
Committee CEN/TC 290 " Dimensional and geometrical product specification and verification", the secretariat
of which is held by AFNOR.
This document is currently submitted to the parallel Enquiry.
Endorsement notice
The text of ISO 286-2:1993/DAM 1 has been approved by CEN as a EN ISO 286-2:1993/prA1:2008 without
any modification.
DRAFT AMENDMENT ISO 286-2:1988/DAmd 1
ISO/TC 213 Secretariat: DS
Voting begins on: Voting terminates on:
2008-01-31 2008-06-30
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
ISO system of limits and fits —
Part 2:
Tables of standard tolerance grades and limit deviations for
holes and shafts
AMENDMENT 1
Système ISO de tolérances et d'ajustements —
Partie 2: Tables des degrés de tolérance normalisés et des écarts limites des alésages et des arbres
AMENDEMENT 1
ICS 17.040.10
ISO/CEN PARALLEL ENQUIRY
The CEN Secretary-General has advised the ISO Secretary-General that this ISO/DIS covers a subject
of interest to European standardization. In accordance with the ISO-lead mode of collaboration as
defined in the Vienna Agreement, consultation on this ISO/DIS has the same effect for CEN
members as would a CEN enquiry on a draft European Standard. Should this draft be accepted, a
final draft, established on the basis of comments received, will be submitted to a parallel two-month FDIS
vote in ISO and formal vote in CEN.
To expedite distribution, this document is circulated as received from the committee secretariat.
ISO Central Secretariat work of editing and text composition will be undertaken at publication
stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
©
International Organization for Standardization, 2008

ISO 286-2:1988/DAmd 1
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ii ISO 2008 – All rights reserved

ISO 286-2:1988/DAM 1
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to ISO 286-2:1988 was prepared by Technical Committee ISO/TC 213, Dimensional and
geometrical product specifications and verification, Subcommittee SC , .
DRAFT 2008
ISO 286-2:1988/DAM 1
Introduction
The new edition of ISO 286-1 “Geometrical product specification (GPS) - ISO system of limits and fits - Part 1:
Basis of tolerances, deviations and fits” influences the content of ISO 286-2 “ISO system of limits and fits -
Part 2: Tables of standard tole
...