ISO 21287:2004

Pneumatic fluid power - Cylinders - Compact cylinders, 1000 kPa (10 bar) series, bores from 20 mm to 100 mm

ISO 21287:2004 establishes a metric series of single rod pneumatic compact cylinders with bores of 20 mm to 100 mm for use of at maximum working pressure of 1 000 kPa (10 bar) with and without magnetic function. This series of pneumatic cylinder is not equipped with adjustable cushioning. Therefore, the application is restricted to those systems where adjustable cushioning is not required. Cylinders with bores of 20 mm and 25 mm can be used with end cover mountings in accordance with ISO 21287:2004. Cylinders with bores from 32 mm to 100 mm can be used with end cover mountings in accordance with ISO 15552. Piston rod mountings can be used for the different bores in accordance with ISO 8139 and ISO 8140.

Transmissions pneumatiques — Vérins — Vérins compacts, série 1000 kPa (10 bar), alésages de 20 mm à 100 mm

L'ISO 21287:2004 spécifie une série métrique des dimensions de base et des fixations nécessaires pour l'interchangeabilité des vérins pneumatiques compacts d'alésage 20 mm à 100 mm, à simple tige, avec ou sans disposition pour capteurs magnétiques, pour une pression maximale de fonctionnement de 1 000 kPa (10 bar). Les vérins pneumatiques de cette série ne sont pas équipés d'amortissement réglable; par conséquent, leur application se limite aux systèmes où l'amortissement réglable n'est pas exigé. Les vérins avec des alésages de 20 mm et 25 mm peuvent être utilisés avec des fixations d'extrémité conformes à l'ISO 21287:2004. Les vérins avec des alésages de 32 mm à 100 mm peuvent être utilisés avec des fixations d'extrémité conformes à l'ISO 15552. Les fixations de tige de piston peuvent être utilisées pour les différents alésages conformément à l'ISO 8139 et à l'ISO 8140.

Fluidna tehnika – Pnevmatika – Valji – Kompaktni valji vrste 1000 kPa (10 bar) in s premeri 20 mm do 100 mm

General Information

• Status: Published
• Publication Date: 01-Jul-2004
• ICS: 23.100.20 - Cylinders
• Technical Committee: ISO/TC 131/SC 3 - Cylinders
• Drafting Committee: ISO/TC 131/SC 3/WG 2 - Pneumatic cylinder mounting dimensions
• Current Stage: 9093 - International Standard confirmed
• Start Date: 08-Mar-2023
• Completion Date: 13-Dec-2025
• Ref Project: SIST ISO 21287:2005 - Pneumatic fluid power -- Cylinders -- Compact cylinders, 1000 kPa (10 bar) series, bores from 20 mm to 100 mm

Overview

ISO 21287:2004 defines a metric series of single‑rod pneumatic compact cylinders for pneumatic fluid power systems, rated to a maximum working pressure of 1 000 kPa (10 bar). The standard covers compact cylinder bores from 20 mm to 100 mm, available with or without magnetic piston function. These cylinders are intended for installations where standard cylinder mounting envelopes are too large and where adjustable cushioning is not required.

Key topics and requirements

• Bore sizes covered: 20, 25, 32, 40, 50, 63, 80, 100 mm (in accordance with ISO 3320).
• Maximum working pressure: 1 000 kPa (10 bar).
• Stroke: Nominal strokes follow ISO 4393; maximum recommended stroke length is 500 mm. Nominal stroke tolerances are specified in the standard.
• No adjustable cushioning: The series is deliberately specified without adjustable end‑stroke cushioning; appropriate only for systems that tolerate fixed end conditions.
• Mounting types and dimensions: Includes mounting types per ISO 6099 such as:
  • MP4 - cap, detachable plain eyes
  • MF1 - head, rectangular flange
  • MF2 - cap, rectangular flange
  • MS1 - end angles Detailed basic and mounting dimensions, tolerances and theoretical reference points (TRP) are defined.
• Interchangeability: Cylinders with 20 mm and 25 mm bores use end cover mountings per ISO 21287; bores 32–100 mm can use end cover mountings per ISO 15552.
• Rod end fittings: Piston rod mountings conform to ISO 8139 and ISO 8140.
• Connections and ports: References to port and stud end dimensions per ISO 16030.
• Identification statement: The standard provides a recommended compliance statement for catalogs and test reports.

Applications and users

ISO 21287 compact cylinders are suited to space‑constrained pneumatic systems and where simple, robust linear actuation is required without adjustable cushioning. Typical applications:

• Industrial automation (pick‑and‑place, indexing)
• Packaging and material handling
• Clamp, ejector and positioning devices
• Machine tools and assembly equipment

Primary users:

• Cylinder manufacturers and OEMs specifying interchangeability
• Mechanical and pneumatic system designers
• Procurement and quality engineers validating component dimensions
• Maintenance and service teams replacing parts to standard dimensions

Related standards

Normative references and complementary standards include:

• ISO 3320 (bore/piston rod metric series)
• ISO 4393 (piston stroke series)
• ISO 6099 (mounting identification)
• ISO 15552 (detachable mountings for bores 32–320 mm)
• ISO 8139 / ISO 8140 (rod end mounting dimensions)
• ISO 16030 (ports and stud ends)

Using ISO 21287:2004 helps ensure dimensional interchangeability, clear mounting definitions, and consistent performance expectations for compact pneumatic cylinders at 10 bar.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2005
Fluidna tehnika – Pnevmatika – Valji – Kompaktni valji vrste 1000 kPa (10 bar) in s
premeri 20 mm do 100 mm
Pneumatic fluid power -- Cylinders -- Compact cylinders, 1000 kPa (10 bar) series, bores
from 20 mm to 100 mm
Transmissions pneumatiques -- Vérins -- Vérins compacts, série 1000 kPa (10 bar),
alésages de 20 mm à 100 mm
Ta slovenski standard je istoveten z: ISO 21287:2004
ICS:
23.100.20 +LGUDYOLþQLYDOML Cylinders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 21287
First edition
2004-07-01
Pneumatic fluid power — Cylinders —
Compact cylinders, 1 000 kPa (10 bar)
series, bores from 20 mm to 100 mm
Transmissions pneumatiques — Vérins — Vérins compacts, série
1 000 kPa (10 bar), alésages de 20 mm à 100 mm

Reference number
©
ISO 2004
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©  ISO 2004
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 either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2004 – All rights reserved

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.
ISO 21287 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 3,
Cylinders.
Introduction
In pneumatic fluid power systems, power is transmitted and controlled through a gas under pressure within a
circuit.
One component of such system is the pneumatic cylinder. This is a device which converts power into linear
force and motion. It consists of a movable element, i.e. a piston, and a piston rod, operating within a cylindrical
bore.
The compact cylinder series without cushioning allows the application of pneumatic cylinders within systems
where “normal” pneumatic cylinder series because of their mounting dimensions cannot be used.

iv © ISO 2004 – All rights reserved

INTERNATIONAL STANDARD ISO 21287:2004(E)

Pneumatic fluid power — Cylinders — Compact cylinders,
1 000 kPa (10 bar) series, bores from 20 mm to 100 mm
1 Scope
This International Standard establishes a metric series of single rod pneumatic compact cylinders with bores
1)
of 20 mm to 100 mm for use of at maximum working pressure of 1 000 kPa (10 bar ) with and without
magnetic function.
This series of pneumatic cylinder is not equipped with adjustable cushioning. Therefore, the application is
restricted to those systems where adjustable cushioning is not required.
Cylinders with bores of 20 mm and 25 mm can be used with end cover mountings in accordance with this
International Standard. Cylinders with bores from 32 mm to 100 mm can be used with end cover mountings in
accordance with ISO 15552. Piston rod mountings can be used for the different bores in accordance with
ISO 8139 and ISO 8140.
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 3320,
...

INTERNATIONAL ISO
STANDARD 21287
First edition
2004-07-01
Pneumatic fluid power — Cylinders —
Compact cylinders, 1 000 kPa (10 bar)
series, bores from 20 mm to 100 mm
Transmissions pneumatiques — Vérins — Vérins compacts, série
1 000 kPa (10 bar), alésages de 20 mm à 100 mm

Reference number
©
ISO 2004
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

©  ISO 2004
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 either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2004 – All rights reserved

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.
ISO 21287 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 3,
Cylinders.
Introduction
In pneumatic fluid power systems, power is transmitted and controlled through a gas under pressure within a
circuit.
One component of such system is the pneumatic cylinder. This is a device which converts power into linear
force and motion. It consists of a movable element, i.e. a piston, and a piston rod, operating within a cylindrical
bore.
The compact cylinder series without cushioning allows the application of pneumatic cylinders within systems
where “normal” pneumatic cylinder series because of their mounting dimensions cannot be used.

iv © ISO 2004 – All rights reserved

INTERNATIONAL STANDARD ISO 21287:2004(E)

Pneumatic fluid power — Cylinders — Compact cylinders,
1 000 kPa (10 bar) series, bores from 20 mm to 100 mm
1 Scope
This International Standard establishes a metric series of single rod pneumatic compact cylinders with bores
1)
of 20 mm to 100 mm for use of at maximum working pressure of 1 000 kPa (10 bar ) with and without
magnetic function.
This series of pneumatic cylinder is not equipped with adjustable cushioning. Therefore, the application is
restricted to those systems where adjustable cushioning is not required.
Cylinders with bores of 20 mm and 25 mm can be used with end cover mountings in accordance with this
International Standard. Cylinders with bores from 32 mm to 100 mm can be used with end cover mountings in
accordance with ISO 15552. Piston rod mountings can be used for the different bores in accordance with
ISO 8139 and ISO 8140.
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 3320, Fluid power systems and components — Cylinder bores and piston rod diameters — Metric series
ISO 4393, Fluid power systems and components — Cylinders — Basic series of piston strokes
ISO 5598, Fluid power systems and components — Vocabulary
ISO 6099, Fluid power systems and components — Cylinders — Identification code for mounting dimensions
and mounting types
ISO 8139, Pneumatic fluid power — Cylinders, 1 000 kPa (10 bar) series — R
...

NORME ISO
INTERNATIONALE 21287
Première édition
2004-07-01
Transmissions pneumatiques —
Vérins — Vérins compacts, série
1 000 kPa (10 bar), alésages de 20 mm à
100 mm
Pneumatic fluid power — Cylinders — Compact cylinders, 1 000 kPa
(10 bar) series, bores from 20 mm to 100 mm

Numéro de référence
©
ISO 2004
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©  ISO 2004
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
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Fax. + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Publié en Suisse
ii © ISO 2004 – Tous droits réservés

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 Normes internationales sont rédigées conformément aux règles données dans les Directives ISO/CEI,
Partie 2.
La tâche principale des comités techniques est d'élaborer les Normes internationales. 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.
L'attention est appelée sur le fait que certains des éléments du présent document peuvent faire l'objet de
droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable de ne
pas avoir identifié de tels droits de propriété et averti de leur existence.
L'ISO 21287 a été élaborée par le comité technique ISO/TC 131, Transmissions hydrauliques et
pneumatiques, sous-comité SC 3, Vérins.
Introduction
Dans les systèmes de transmissions pneumatiques, l'énergie est transmise et commandée par l'intermédiaire
d'un gaz sous pression circulant dans un circuit.
L'un des composants de ces systèmes de transmissions est le vérin pneumatique. Un vérin est un appareil
qui transforme l'énergie du fluide en énergie mécanique agissant linéairement. Il est constitué d'un élément
mobile composé d'un piston et d'une tige de piston se déplaçant à l'intérieur d'un alésage cylindrique.
La série vérin compact sans amortissement permet l'utilisation de vérins pneumatiques dans des systèmes où
la série vérin pneumatique «normal» ne peut pas être utilisée en raison de leurs dimensions de montage.

iv © ISO 2004 – Tous droits réservés

NORME INTERNATIONALE ISO 21287:2004(F)

Transmissions pneumatiques — Vérins — Vérins compacts,
série 1 000 kPa (10 bar), alésages de 20 mm à 100 mm
1 Domaine d'application
La présente Norme internationale spécifie une série métrique des dimensions de base et des fixations
nécessaires pour l'interchangeabilité des vérins pneumatiques compacts d'alésage 20 mm à 100 mm, à
simple tige, avec ou sans disposition pour capteurs magnétiques, pour une pression maximale de
1)
fonctionnement de 1 000 kPa (10 bar ).
Les vérins pneumatiques de cette série ne sont pas équipés d'amortissement réglable; par conséquent, leur
application se limite aux systèmes où l'amortissement réglable n'est pas exigé.
Les vérins avec des alésages de 20 mm et 25 mm peuvent être utilisés avec des fixations d'extrémité
conformes à la présente Norme internationale. Les vérins avec des alésages de 32 mm à 100 mm peuvent
être utilisés avec des fixations d'extrémité conformes à l'ISO 15552. Les fixations de tige de piston peuvent
être utilisées pour les différents alésages conformément à l'ISO 8139 et à l'ISO 8140.
2 Références normatives
Les documents de référence suivants sont indispensables pour l'application du présent document. Pour les
références datées, seule l'édition citée s'applique. Pour les références non datées, la dernière édition du
document de référence s'applique (y compris les éventuels amendements).
ISO 3320, Transmissions hydrauliques et pneumatiques — Alésages des vérins et diamètres des tiges de
piston — Série métrique
ISO 4393, Transmissions hydrauliques et pneumatiques — Vérins — Série de base de courses de piston
ISO 5598, Transmissions hydrauliques et pneumatiques —
...