ISO 4379:2024

Plain bearings - Copper alloy bushes - Dimensions and tolerances

This document specifies dimensions and tolerances for cylindrical and flanged bushes with inside diameter, d1, in the range 6 mm to 200 mm. This document applies to solid mono-metal copper alloy bushes to be used as plain bearings with and without oil holes and oil grooves.

Paliers lisses — Bagues en alliages de cuivre — Dimensions et tolérances

General Information

• Status: Published
• Publication Date: 18-Dec-2024
• ICS: 21.100.10 - Plain bearings
• Technical Committee: ISO/TC 123/SC 3 - Dimensions, tolerances and construction details
• Drafting Committee: ISO/TC 123/SC 3 - Dimensions, tolerances and construction details
• Current Stage: 6060 - International Standard published
• Start Date: 19-Dec-2024
• Due Date: 28-Nov-2024
• Completion Date: 19-Dec-2024

Relations

• Revises: ISO 4379:2018 - Plain bearings - Copper alloy bushes
• Effective Date: 03-Dec-2022

Overview

ISO 4379:2024 - Plain bearings - Copper alloy bushes - Dimensions and tolerances defines standardized dimensions, chamfers and tolerance classes for solid mono‑metal copper alloy bushes used as plain bearings. The standard covers cylindrical (type C) and flanged (type F) bushes with inside diameters (d1) from 6 mm to 200 mm, and applies to bushes with or without oil holes and oil grooves.

Key topics

• Dimensions and tolerance tables: Detailed size tables for type C and type F bushes (including Series 1 and Series 2 for flanged types) and associated tolerance classes; specific tolerances are given in Table 3 of the standard.
• Chamfers and construction: Typical outside chamfers of 45° and 15° are specified; special chamfers and undercuts are handled by agreement between manufacturer and customer.
• Material requirements: Cast and wrought copper alloys referenced to ISO 4382‑1 and ISO 4382‑2 respectively.
• Surface finish: Surface roughness indication follows ISO 21920‑1; edges must be free of burrs and slight outside indentations are permissible if they do not affect fit/function.
• Fits and tolerancing notes: Guidance on shaft fits, IT grade considerations, coaxial tolerance and axial runout. The document references general tolerancing rules in ISO 2768‑1.
• Quality assurance and inspection: References ISO 12301 for control techniques and inspection of geometrical and material characteristics.
• Designation rules: Standardized naming examples (e.g., “Bush ISO 4379 - C 20 × 24 × 20 Y - CuSn8P”) and notes on specifying chamfers, oil features and tolerance deviations.

Applications

ISO 4379:2024 is intended for:

• OEMs and component manufacturers producing plain bearing bushes for general machinery and rotating assemblies.
• Mechanical designers and bearing engineers specifying copper alloy bushings for sliding or plain bearing applications.
• Quality engineers and inspectors verifying dimensional conformance, surface finish and material per referenced ISO standards.
• Procurement and supply chain teams ensuring interchangeable, standardized bushes for maintenance and production.

Typical use cases include pivot points, gearboxes, pumps, compressors and other assemblies where plain bearings (bushings) are required, including designs with hydrodynamic or boundary lubrication (note: fits should be checked for hydrodynamic lubrication conditions).

Related standards

• ISO 4382‑1 / ISO 4382‑2 - copper alloy material specifications
• ISO 21920‑1 (and Parts 2–3 in bibliography) - surface texture/profile
• ISO 2768‑1 - general tolerances
• ISO 12128 - lubrication holes, grooves and pockets for bushes
• ISO 12301 - quality control techniques for plain bearings

Keywords: ISO 4379:2024, plain bearings, copper alloy bushes, bush dimensions, tolerances, surface finish, flanged bushes, cylindrical bushes, ISO 4382, ISO 21920.

Standards Content (Sample)

International
Standard
ISO 4379
Fourth edition
Plain bearings — Copper alloy
2024-12
bushes — Dimensions and
tolerances
Paliers lisses — Bagues en alliages de cuivre — Dimensions et
tolérances
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 Dimensions and tolerances . 2
6 Material. 6
7 Surface finish . 6
8 Construction . 7
9 Quality assurance . 7
10 Designation . 7
Bibliography . 8

iii
Foreword
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bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
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ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
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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 123, Plain bearings, Subcommittee SC 3,
Dimensions, tolerances and construction details.
This fourth edition cancels and replaces the third edition (ISO 4379:2018), which has been technically
revised.
The main changes are as follows:
— the title has been revised;
— surface roughness and a normative reference to ISO 21920-1 have been added;
— Bibliographical references have been revised.
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
International Standard ISO 4379:2024(en)
Plain bearings — Copper alloy bushes — Dimensions and
tolerances
1 Scope
This document specifies dimensions and tolerances for cylindrical and flanged bushes with inside diameter,
d , in the range 6 mm to 200 mm.
This document applies to solid mono-metal copper alloy bushes to be used as plain bearings with and
without oil holes and oil grooves.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements 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 2768-1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual
tolerance indications
ISO 4382-1, Plain bearings — Copper alloys — Part 1: Cast copper alloys for solid and multilayer thick-walled
plain bearings
ISO 4382-2, Plain bearings — Copper alloys — Part 2: Wrought copper alloys for solid plain bearings
ISO 21920-1, Geometrical product specifications (GPS) — Surface texture: Profile — Part 1: Indication of
surface texture
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Symbols
b bush width mm
b flange width mm
c inside chamfer mm
c outside chamfer mm
d shaft diameter mm
d inside diameter mm
d outside diameter mm
d outside diameter of flange mm
u undercut width mm
5 Dimensions and tolerances
Dimensions shall be as shown and given in Figure 1 and in Table 1 and Table 2.
Tolerances shall be as given in Table 3.
Tolerance classes which deviate from those given in this document shall in each case be added in the
designation to the nominal size.
The dimensions of d shall be used to
...