ISO 15524:2026

• Abstract:

  This document establishes a metric series of single-rod pneumatic short‑stroke cylinders with bores from 20 mm to 100 mm (inclusive) for use at a maximum working pressure of 1 000 kPa [10 bar1)] with and without magnetic function. They are not equipped with adjustable cushioning, so their application is restricted to those systems where adjustable cushioning is not required. 1) 1 bar = 100 kPa = 105 Pa; 1 Pa = 1 N/m2.

• Status: Published
• Publication Date: 30-Sep-2026
• ICS: 23.100.50 - Control components
• Technical Committee: ISO/TC 131/SC 3 - Cylinders
• Drafting Committee: ISO/TC 131/SC 3/WG 2 - Pneumatic cylinder mounting dimensions
• Current Stage: 6060 - International Standard published
• Start Date: 01-Oct-2026
• Due Date: 12-Dec-2027
• Completion Date: 01-Oct-2026

• Revises: ISO 15524:2011 - Pneumatic fluid power — Cylinders — Single-rod short-stroke cylinders, 1 000 kPa (10 bar) series, bores from 20 mm to 100 mm
• Effective Date: 07-Jan-2025

ISO 15524:2026 is an International Standard from ISO for single-rod pneumatic short-stroke cylinders in the 1 000 kPa (10 bar) series. It specifies the bore sizes, nominal strokes, main dimensions, mounting types and identification details for cylinders with and without magnetic function. In practice, it helps designers, manufacturers and buyers select cylinders that fit standard pneumatic installations where adjustable cushioning is not needed.

What does ISO 15524:2026 specify?

ISO 15524:2026 establishes a metric series of single-rod pneumatic short-stroke cylinders with bores from 20 mm to 100 mm. The document organizes the series through clauses on bores, stroke, dimensions, mounting types, ordering designation and identification, plus one informative annex for an external threaded rod end.

Annex	What it covers
Annex A	Reference dimensions for an external threaded rod end

The scope is practical: it defines a standard family of cylinders for a maximum working pressure of 1 000 kPa (10 bar), and it limits use to systems that do not require adjustable cushioning. That matters because it tells the reader whether the cylinder family fits the intended application before any detailed design work begins.

What are the key requirements of ISO 15524:2026?

ISO 15524:2026 is mainly a dimensional standard. Its core requirements are the standard bore series, the permitted stroke selection, the defined mounting types, and the basic dimensions needed to make cylinders interchangeable.

Bore sizes and stroke selection

Clause 4 fixes the bore sizes in the series at standard metric values in accordance with ISO 3320. Clause 5 says nominal strokes shall be selected from the recommended values in ISO 4393, and the maximum stroke length should not exceed 100 mm.

In practice, this means a designer does not invent a bore or stroke at random. The cylinder is chosen from a controlled set of sizes, which supports interchangeability, ordering consistency and matching to existing machine layouts.

Dimensional layout of the cylinder

Clause 6 states that the basic dimensions shall conform to Figures 2, 3 and 4 and Tables 2 and 3. The tables give the key body and interface dimensions for the covered mounting types, while Annex A gives reference dimensions for an external threaded rod end.

This matters for drawings, procurement and inspection. If the body, rod end and interface dimensions follow the standard, the cylinder should fit the intended mount and connection points without redesigning the machine.

Mounting types and reference point

Clause 7 covers the mounting types MB1, MX8 and MX9, which are identified in accordance with ISO 6099. The clause also uses the theoretical reference point (TRP), a fixed reference used when locating dimensions on the cylinder.

For the reader, this is the part that controls how the cylinder is attached and positioned. It is the section to check when matching the cylinder to a machine frame, head, cap or body mounting arrangement.

Ordering and identification

Clause 8 gives an example of an ordering designation, combining the mounting type, bore and stroke. Clause 9 provides a standard identification statement for use in test reports, catalogues and sales literature when claiming conformity.

In practice, these clauses are what purchasing and quality teams need. They show how to write a clear order and how to reference the document consistently in records and product literature.

What terms does ISO 15524:2026 define?

ISO 15524:2026 uses the terms and definitions of ISO 5598. The following terms are especially important for understanding the document:

• Single-rod cylinder - a cylinder with one piston rod extending from one side of the piston.
• Short-stroke cylinder - a cylinder intended for relatively short linear movement, as used in this series.
• Bore - the cylinder diameter that defines the size series.
• Nominal stroke - the selected stroke length used to identify the cylinder.
• Mounting type - the attachment arrangement of the cylinder, such as MB1, MX8 or MX9.
• Theoretical reference point (TRP) - the reference point used to locate mounting dimensions in ISO 6099.
• Magnetic function - the magnetic option of the cylinder referred to in the scope.
• Adjustable cushioning - stroke-end cushioning that this series does not provide.

Who uses ISO 15524:2026?

ISO 15524:2026 is used by cylinder manufacturers, pneumatic system designers, machine builders, buyers and quality teams. It supports product selection, drawing creation, ordering, inspection and documentation for fluid power equipment.

It is especially relevant in automation and general machinery where standardized pneumatic cylinders are needed. Test and documentation teams also use it for conformity statements in reports, catalogues and sales literature.

What changed in ISO 15524:2026 from the previous edition?

ISO 15524:2026 is the second edition and it cancels and replaces ISO 15524:2011. The foreword states that the document was technically revised, and the main change is the addition of Annex A to give reference dimensions for an external threaded rod end.

That change reflects current market practice, where external threaded rod ends are widely available and used.

Which standards are used with ISO 15524:2026?

ISO 15524:2026 uses these normative references:

• ISO 3320 - provides the metric series for cylinder bores and piston rod diameters used for the bore sizes.
• ISO 4393 - provides the basic series of piston strokes used when selecting nominal stroke lengths.
• ISO 5598 - provides the vocabulary and terms and definitions used in the document.
• ISO 6099 - provides the identification code for mounting dimensions and mounting types, including the TRP concept.
• ISO 16030 - provides the connections for ports and stud ends used with the cylinder dimensions.

What does the ISO 15524:2026 document contain?

ISO 15524:2026 contains one scope clause, one normative references clause, one terms clause, and clauses for bore sizes, nominal stroke, dimensions, mounting types, ordering designation and identification statement. It includes Figures 1 to 4 and Tables 1 to 3 for the cylinder series and mounting dimensions.

Annex A adds a reference design for the external threaded rod end, with Table A.1 for symbols, Figure A.1 for the layout and Table A.2 for the dimensions. Together, these parts give the dimensional basis for design, ordering, checking and describing the cylinders covered by the standard.

International
Standard
ISO 15524
Second edition
Pneumatic fluid power — Cylinders
2026-10
— Single-rod short-stroke cylinders,
1 000 kPa (10 bar) series, bores
from 20 mm to 100 mm
Transmissions pneumatiques — Vérins — Vérins course courte à
simple tige, série à 1 000 kPa (10 bar), diamètres de 20 mm à 100
mm
Reference number
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Bore sizes . 1
5 Nominal stroke . 2
6 Dimensions . 2
7 Mounting types . 2
8 Example of ordering designation . 4
9 Identification statement (reference to this document) . 4
Annex A (informative) External threaded rod end . 5

iii
Foreword
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Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 3,
Cylinders.
This second edition cancels and replaces the first edition (ISO 15524:2011), which has been technically
revised.
The main changes are as follows:
— Addition of Annex A to reflect the state of the art: in the current market, many cylinders of an external
threaded rod end are available other than cylinders of an internal threaded rod end. Also, their standards
are standardized in some countries. Therefore, the dimensions of an external threaded rod end were
added to Annex A as reference.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
Introduction
In pneumatic fluid power systems, power is transmitted and controlled through a gas under pressure within
a circuit.
One component of such systems is the pneumatic fluid power cylinder. This
...