ISO 8139:2026
(Main)Pneumatic fluid power — Cylinders, 1 000 kPa (10 bar) series — Mounting dimensions of rod-end spherical eyes
General Information
- Abstract
This document specifies the mounting dimensions required for interchangeability of rod-end spherical eyes of pneumatic cylinders. The rod-end spherical eyes have been designed specifically for the use with 1 000 kPa [10 bar1)] series cylinders manufactured in accordance with ISO 6432 and ISO 15552, but this does not limit their application. The spherical bearing end eyes are used on piston rods of pneumatic cylinders for mechanically transmitting the cylinder force under oscillatory rotational and tilting movements. The design of the rod-end spherical eyes is based on the maximum forces resulting from the specified internal diameter of the cylinders and pressure according to ISO 6432, ISO 15552 and ISO 21287. 1)1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.
- Status
- Published
- Publication Date
- 17-Sep-2026
- 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
- 18-Sep-2026
- Due Date
- 12-Dec-2027
- Completion Date
- 18-Sep-2026
Overview
ISO 8139:2026 specifies the mounting dimensions required for the interchangeability of rod-end spherical eyes on pneumatic cylinders, particularly those in the 1 000 kPa (10 bar) series. This international standard ensures compatibility of rod-end spherical eyes with pneumatic cylinders manufactured according to ISO 6432 and ISO 15552. These spherical eyes are critical components used at the rod end of cylinders to mechanically transmit force under oscillatory rotational and tilting movements. Adherence to this standard facilitates consistent installation, maintenance, and replacement of pneumatic cylinder accessories, promoting global compatibility and interchangeability.
Key Topics
Scope of Applicability
ISO 8139:2026 concentrates on pneumatic fluid power systems, defining essential mounting dimensions for rod-end spherical eyes. While focused on cylinders designed for 1 000 kPa (10 bar) operations, the standard does not limit application to this pressure range.Interchangeability and Compatibility
The standard ensures that rod-end spherical eyes are interchangeable across pneumatic cylinders that meet ISO 6432, ISO 15552, and ISO 21287 standards. This streamlines procurement, engineering, and maintenance processes by enabling standardized mounting procedures.Installation Guidelines
Application instructions cover installation tolerances, shaft fitting, and best practices for achieving optimal tilting angles and locking methods. It recommends specific tolerances (m6 or, in exceptions, f7) and outlines the importance of using suitable locking nuts and lubrication.Bearing Life and Lubrication
The standard provides guidance on factors influencing bearing life, such as load, lubricant type, and frequency of lubrication. Recommendations for lubrication strategies help maximize operational lifespan.Ordering and Identification
ISO 8139:2026 standardizes the ordering method for rod-end spherical eyes to ensure the right fit and function. Users are encouraged to include references to the standard in technical documentation and procurement.
Applications
Pneumatic Cylinder Assemblies
Widely used in manufacturing automation, assembly lines, and machinery, pneumatic cylinders with standardized rod-end spherical eyes facilitate smooth installation, repair, and replacement.Oscillatory and Tilting Motion Systems
The spherical eye design accommodates small degrees of oscillatory rotation and tilting, critical in applications where motion misalignment can occur.Industrial Automation
Designers and engineers in automation industries benefit from using certified rod-end spherical eyes, ensuring reliability and global supply chain interoperability.Maintenance and Replacement
Maintenance teams rely on standards-based dimensions for straightforward replacement of worn or damaged components without modifying connected assemblies.
Related Standards
- ISO 6432: Defines basic and mounting dimensions for pneumatic single rod cylinders (1 000 kPa series).
- ISO 15552: Specifies mounting and accessory dimensions for detachable mountings on pneumatic cylinders (1 000 kPa series).
- ISO 21287: Sets dimensions for compact pneumatic cylinders (1 000 kPa series).
- ISO 6099: Provides identification codes for mounting dimensions and types of cylinders.
- ISO 5598: Delivers vocabulary for fluid power systems and components.
- ISO 286-2: Offers tables of standard tolerance classes and deviation limits for linear sizes.
Practical Value
Adopting ISO 8139:2026 enhances global compatibility in pneumatic fluid power systems. By following internationally recognized mounting dimensions, organizations benefit from reduced downtime, simplified procurement, and easier global collaboration. Manufacturers, suppliers, and end-users in automation, manufacturing, and maintenance can ensure the reliable function and straightforward interchangeability of rod-end spherical eyes in their pneumatic systems, supporting efficiency and safety across a wide range of industrial applications.
Keywords: ISO 8139:2026, pneumatic cylinders, rod-end spherical eyes, mounting dimensions, fluid power, interchangeability, industrial automation, pneumatic accessories, standardization, compatibility.
Relations
- Effective Date
- 07-Jan-2025
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Frequently Asked Questions
ISO 8139:2026 is a standard published by the International Organization for Standardization (ISO). Its full title is "Pneumatic fluid power — Cylinders, 1 000 kPa (10 bar) series — Mounting dimensions of rod-end spherical eyes". This standard covers: This document specifies the mounting dimensions required for interchangeability of rod-end spherical eyes of pneumatic cylinders. The rod-end spherical eyes have been designed specifically for the use with 1 000 kPa [10 bar1)] series cylinders manufactured in accordance with ISO 6432 and ISO 15552, but this does not limit their application. The spherical bearing end eyes are used on piston rods of pneumatic cylinders for mechanically transmitting the cylinder force under oscillatory rotational and tilting movements. The design of the rod-end spherical eyes is based on the maximum forces resulting from the specified internal diameter of the cylinders and pressure according to ISO 6432, ISO 15552 and ISO 21287. 1)1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.
This document specifies the mounting dimensions required for interchangeability of rod-end spherical eyes of pneumatic cylinders. The rod-end spherical eyes have been designed specifically for the use with 1 000 kPa [10 bar1)] series cylinders manufactured in accordance with ISO 6432 and ISO 15552, but this does not limit their application. The spherical bearing end eyes are used on piston rods of pneumatic cylinders for mechanically transmitting the cylinder force under oscillatory rotational and tilting movements. The design of the rod-end spherical eyes is based on the maximum forces resulting from the specified internal diameter of the cylinders and pressure according to ISO 6432, ISO 15552 and ISO 21287. 1)1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.
ISO 8139:2026 is classified under the following ICS (International Classification for Standards) categories: 23.100.20 - Cylinders. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 8139:2026 has the following relationships with other standards: It is inter standard links to ISO 8139:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 8139:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
International
Standard
ISO 8139
Fifth edition
Pneumatic fluid power — Cylinders,
2026-09
1 000 kPa (10 bar) series —
Mounting dimensions of rod-end
spherical eyes
Transmissions pneumatiques — Vérins, série 1 000 kPa (10
bar) — Dimensions d'interchangeabilité des tenons à rotule
d'extrémité de tige
Reference number
© ISO 2026
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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 Mounting dimensions . 1
5 Application instructions . 2
5.1 Installation .2
5.2 Bearing life .3
5.3 Lubrication .3
6 Example of ordering designation . 3
7 Identification statement (reference to this document) . 3
Bibliography . 4
iii
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This document was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 3,
Cylinders.
This fifth edition cancels and replaces the fourth edition (ISO 8139:2018), which has been technically
revised.
The main changes are a
...