ISO 12240-3:1998

Spherical plain bearings — Part 3: Thrust spherical plain bearings

This part of ISO 12240 specifies dimensions and tolerances for thrust spherical plain bearings. The specified tolerance values apply to finished, thrust spherical plain bearings before any coating or plating. Thrust spherical plain bearings need not conform to the design illustrated but compliance is required as regards dimensions and tolerances specified. NOTE — Thrust spherical plain bearings for airframe applications are not covered by this part of ISO 12240.

Rotules lisses — Partie 3: Rotules lisses axiales

La présente partie de l'ISO 12240 prescrit les dimensions et les tolérances des rotules lisses axiales. Les valeurs prescrites pour les tolérances s'appliquent aux rotules lisses axiales obtenues avant tout revêtement ou plaquage. Les rotules lisses axiales ne sont pas censées se conformer aux schémas donnés ici ; la conformité n'est requise que pour les dimensions et tolérances prescrites. NOTE — Les rotules lisses axiales pour les applications aéronautiques ne sont pas couvertes par la présente partie de l'ISO 12240.

Kroglasti drsni zgibi - 3. del: Aksialni kroglasti drsni zgibi

General Information

• Status: Published
• Publication Date: 19-Aug-1998
• ICS: 21.100.10 - Plain bearings
• Technical Committee: ISO/TC 4/SC 7 - Spherical plain bearings
• Drafting Committee: ISO/TC 4/SC 7 - Spherical plain bearings
• Current Stage: 9093 - International Standard confirmed
• Start Date: 05-Mar-2026
• Completion Date: 07-Mar-2026
• Ref Project: SIST ISO 12240-3:2001 - Spherical plain bearings -- Part 3: Thrust spherical plain bearings

Overview

ISO 12240-3:1998 is an international standard developed by ISO, specifying the required dimensions and tolerances for thrust spherical plain bearings. This part of the ISO 12240 series ensures consistency in bearing dimensions, facilitating interchangeability and reliable fit across various applications worldwide. The requirements address only finished, uncoated, and unplated bearings, making them universally applicable to general industrial uses. It is important to note that this part of the standard does not include thrust spherical plain bearings specific to airframe applications.

Key Topics

• Scope and Applicability:
  ISO 12240-3:1998 details the nominal dimensions, designations, and tolerance values for thrust spherical plain bearings, ensuring a uniform approach within the industry.

• Essential Dimensions:
  The standard specifies key dimensional requirements such as bore diameter, outside diameter, bearing height, and chamfer dimensions-all crucial for proper function and interchangeability.

• Tolerance Requirements:
  Tolerances are given for both shaft and housing washers as well as bearing height, with precise limits to guarantee reliable performance prior to any post-processing (like coating or plating).

• Design Flexibility:
  While compliance with specified dimensions and tolerances is mandatory, conformity to an illustrated design is not required, giving engineers flexibility in product development.

• Exclusions:
  The standard explicitly excludes thrust spherical plain bearings for airframe applications, which are subject to separate aerospace-specific standards.

Applications

Thrust spherical plain bearings play a vital role in a variety of engineering and industrial contexts. By adhering to ISO 12240-3:1998, manufacturers, engineers, and end-users benefit from:

• Interchangeability:
  By following uniform dimensions and tolerances, bearings from different producers are interchangeable, supporting global sourcing and replacement.

• Mechanical Engineering:
  Widely used in heavy machinery and equipment, these bearings can accommodate axial loads and misalignment requirements, especially useful in hydraulic cylinders, construction machinery, and presses.

• Industrial Maintenance:
  Standardized tolerances ensure reliable fit and performance, simplifying maintenance and minimizing downtime for industrial equipment.

• Custom Solutions:
  The standard's flexibility allows designers to meet unique operational requirements while maintaining global compliance, critical for OEMs and component suppliers.

• Quality Assurance:
  Adhering to ISO 12240-3 streamlines inspection and quality control processes, reducing variability and improving product reliability.

Related Standards

• ISO 12240-1:
  Spherical plain bearings - Part 1: Radial spherical plain bearings
  Covers dimensions and tolerances for radial types.

• ISO 12240-2:
  Spherical plain bearings - Part 2: Angular contact radial spherical plain bearings
  Defines specifications for angular contact variants.

• ISO 12240-4:
  Spherical plain bearings - Part 4: Spherical plain bearing rod ends
  Provides requirements for rod end designs.

• ISO 582:
  Rolling bearings – Chamfer dimensions – Maximum values
  Specifies maximum chamfer dimensions relevant for bearing interfaces.

• ISO 1132-1:
  Rolling bearings – Tolerances – Terms and definitions
  Defines general terminology and concepts used across bearing tolerance standards.

• ISO 6811:
  Spherical plain bearings – Vocabulary
  Offers definitions crucial to understanding bearing designs and parameters.

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Keywords: ISO 12240-3, thrust spherical plain bearings, bearing tolerances, bearing dimensions, plain bearing standard, industrial bearings, spherical bearings, ISO bearing standards, rolling bearings, mechanical engineering.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kroglasti drsni zgibi - 3. del: Aksialni kroglasti drsni zgibiRotules lisses -- Partie 3: Rotules lisses axialesSpherical plain bearings -- Part 3: Thrust spherical plain bearings21.100.10Drsni ležajiPlain bearingsICS:Ta slovenski standard je istoveten z:ISO 12240-3:1998SIST ISO 12240-3:2001en01-julij-2001SIST ISO 12240-3:2001SLOVENSKI
STANDARD
AReference numberISO 12240-3:1998(E)INTERNATIONALSTANDARDISO12240-3First edition1998-08-15Spherical plain bearings —Part 3:Thrust spherical plain bearingsRotules lisses —Partie 3: Rotules lisses axialesSIST ISO 12240-3:2001

ISO 1998All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronicor mechanical, including photocopying and microfilm, without permission in writing from the publisher.International Organization for StandardizationCase postale 56 · CH-1211 Genève 20 · [e-mail] in SwitzerlandiiForewordISO (the International Organization for Standardization) is a worldwide federation of national standard bodies(ISO member bodies). The work of preparing International Standards is normally carried out through ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. International organizations, governmental andnon-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the InternationalElectrotechnical Commission (IEC) on all matters of electrotechnical standardization.Draft International Standards adopted by the technical committees are circulated to the member bodies forvoting. Publication as an International Standard requires approval by at least 75 % of the member bodies castinga vote.International Standard ISO 12240-3 was prepared by Technical Committee ISO/TC 4, Rolling bearings,Subcommittee SC 7, Spherical plain bearings.ISO 12240 consists of the following parts, under the general title Spherical plain bearings:—Part 1: Radial spherical plain bearings—Part 2: Angular contact radial spherical plain bearings—Part 3: Thrust spherical plain bearings—Part 4: Spherical plain bearing rod endsSIST ISO 12240-3:2001

INTERNATIONAL STANDARD
© ISOISO 12240-3:1998(E)1Spherical plain bearings —Part 3:Thrust spherical plain bearings1
ScopeThis part of ISO 12240 specifies dimensions and tolerances for thrust spherical plain bearings.The specified tolerance values apply to finished, thrust spherical plain bearings before any coating or plating.Thrust spherical plain bearings need not conform to the design illustrated but compliance is required as regardsdimensions and tolerances specified.NOTE —
Thrust spherical plain bearings for airframe applications are not covered by this part of ISO 12240.2
Normative referencesThe following standards contain provisions which, through reference in this text, constitute provisions of this partof ISO 12240. At the time of publication, the editions indicated were valid. All standards are subject to revision,and parties to agreements based on this part of ISO 12240 are encouraged to investigate the possibi
...

INTERNATIONAL ISO
STANDARD 12240-3
First edition
1998-08-15
Spherical plain bearings —
Part 3:
Thrust spherical plain bearings
Rotules lisses —
Partie 3: Rotules lisses axiales
Reference number
A
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standard 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.
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.
International Standard ISO 12240-3 was prepared by Technical Committee ISO/TC 4, Rolling bearings,
Subcommittee SC 7, Spherical plain bearings.
ISO 12240 consists of the following parts, under the general title Spherical plain bearings:
— Part 1: Radial spherical plain bearings
— Part 2: Angular contact radial spherical plain bearings
— Part 3: Thrust spherical plain bearings
— Part 4: Spherical plain bearing rod ends
©  ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
Printed in Switzerland
ii
©
INTERNATIONAL STANDARD  ISO ISO 12240-3:1998(E)
Spherical plain bearings —
Part 3:
Thrust spherical plain bearings
1 Scope
This part of ISO 12240 specifies dimensions and tolerances for thrust spherical plain bearings.
The specified tolerance values apply to finished, thrust spherical plain bearings before any coating or plating.
Thrust spherical plain bearings need not conform to the design illustrated but compliance is required as regards
dimensions and tolerances specified.
NOTE —  Thrust spherical plain bearings for airframe applications are not covered by this part of ISO 12240.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part
of ISO 12240. At the time of publication, the editions indicated were valid. All standards are subject to revision,
and parties to agreements based on this part of ISO 12240 are encouraged to investigate the possibility of
applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of
currently valid International Standards.
ISO 582 : 1995, Rolling bearings – Chamfer dimensions – Maximum values.
1)
ISO 1132-1: — , Rolling bearings – Tolerances – Part 1: Terms and definitions.
ISO 6811:1998, Spherical plain bearings – Vocabulary.
3 Definitions and symbols
For the purposes of this part of ISO 12240, the definitions given in ISO 1132-1 and ISO 6811 apply. The symbols
(except those for tolerances) shown in figure 1 and the values given in the tables denote nominal dimensions
unless specified otherwise.
B Shaft washer height
C Housing washer height
D Outside diameter
D Bor
...

NORME ISO
INTERNATIONALE 12240-3
Première édition
1998-08-15
Rotules lisses —
Partie 3:
Rotules lisses axiales
Spherical plain bearings —
Part 3: Thrust spherical plain bearings
A
Numéro de référence
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes
nationaux de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est
en général confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a
le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,
gouvernementales et non gouvernementales, en liaison avec l'ISO participent également aux travaux.
L'ISO collabore étroitement avec la Commission électrotechnique internationale (CEI) en ce qui
concerne la normalisation électrotechnique.
Les projets de Normes internationales adoptés par les comités techniques sont soumis aux comités
membres pour vote. Leur publication comme Normes internationales requiert l'approbation de 75 % au
moins des comités membres votants.
La Norme internationale ISO 12240-3 a été élaborée par le comité technique ISO/TC 4, Roulements,
sous-comité SC 7, Rotules lisses.
L'ISO 12240 comprend les parties suivantes, présentées sous le titre général Rotules lisses:
— Partie 1: Rotules lisses radiales
— Partie 2: Rotules lisses radiales à contact oblique
— Partie 3: Rotules lisses axiales
— Partie 4: Embouts à rotule
©  ISO 1998
Droits de reproduction réservés. Sauf prescription différente, aucune partie de cette publication ne peut être reproduite ni utilisée sous quelque
forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l'éditeur.
Organisation internationale de normalisation
Case postale 56 • CH-1211 Genève 20 • Suisse
Internet [e-mail]
Imprimé en Suisse
ii
©
NORME INTERNATIONALE  ISO ISO 12240-3:1998(F)
Rotules lisses —
Partie 3:
Rotules lisses axiales
1 Domaine d'application
La présente partie de l'ISO 12240 prescrit les dimensions et les tolérances des rotules lisses axiales.
Les valeurs prescrites pour les tolérances s'appliquent aux rotules lisses axiales obtenues avant tout
revêtement ou plaquage.
Les rotules lisses axiales ne sont pas censées se conformer aux schémas donnés ici ; la conformité
n'est requise que pour les dimensions et tolérances prescrites.
NOTE —  Les rotules lisses axiales pour les applications aéronautiques ne sont pas couvertes par la présente
partie de l'ISO 12240.
2 Références normatives
Les normes suivantes contiennent des dispositions qui, par suite de la référence qui en est faite,
constitue des dispositions valables pour la présente partie de l'ISO 12240. Au moment de la publication,
les éditions indiquées étaient en vigueur. Toute norme est sujette à révision et les parties prenantes des
accords fondés sur la présente partie de l'ISO 12240 sont invitées à rechercher la possibilité d'appliquer
les éditions les plus récentes des normes indiquées ci-après. Les membres de la CEI et de l'ISO
possèdent le registre des Normes internationales en vigueur à un moment donné.
ISO 582:1995, Roulements — Dimensions des arrondis — Valeurs maximales.
1)
ISO 1132-1: — , Roulements — Tolérances — Partie 1: Termes et définitions.
Rotules lisses — Vocabulaire
ISO 6811:1998, .
1)  À publier. (Révision de l'ISO 1132:1980)
©
3 Définitions et symboles
Pour les besoins de la présente partie de l'ISO 12240, les définitions données dans l'ISO 1132-1 et
l'ISO 6811 s'appliquent. Les symboles (excepté ceux pour les tolérances) montrés sur la figure 1 et les
valeurs données dans les tableaux sont les d
...