SIST ISO 3548-2:2021

Plain bearings - Thin-walled half bearings with or without flange - Part 2: Measurement of wall thickness and flange thickness

This document specifies in accordance with ISO 12301 the checking of the wall-thickness of thin-walled half bearings with or without flange and describes the necessary checking methods and measuring equipment.
It applies to a maximum bearing diameter of 150 mm. It can be applied to a bigger diameter, provided that there is an agreement between the supplier and the user.

Paliers lisses - Demi-coussinets minces à ou sans collerette - Partie 2: Mesurage de l'épaisseur de paroi et de l'épaisseur de collerette

Drsni ležaji - Tankosteni polovični ležaji s prirobnico ali brez nje - 2. del: Merjenje debelin stene in prirobnice

General Information

• Status: Published
• Publication Date: 07-Sep-2021
• ICS: 21.100.10 - Plain bearings
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 02-Sep-2021
• Due Date: 07-Nov-2021
• Completion Date: 08-Sep-2021
• Ref Project: ISO 3548-2:2020 - Plain bearings - Thin-walled half bearings with or without flange - Part 2: Measurement of wall thickness and flange thickness

Relations

• Replaces: SIST ISO 3548-2:2010 - Plain bearings - Thin-walled half bearings with or without flange - Part 2: Measurement of wall thickness and flange thickness
• Effective Date: 01-Oct-2021

Overview

ISO 3548-2:2020 - Plain bearings - Thin-walled half bearings with or without flange - Part 2: Measurement of wall thickness and flange thickness - specifies approved methods for checking the wall- and flange-thickness of thin-walled half bearings. The standard defines measuring principles, measuring points and lines, equipment requirements and acceptance practices for bearings up to a nominal outside diameter of 150 mm (larger diameters can be handled by supplier–user agreement). It is intended to ensure bearing clearance and operational efficiency by verifying wall-thickness tolerances in accordance with ISO 12301 and ISO 3548-1.

Key topics and technical requirements

• Measuring principles
  • Gauging axis must be radial and perpendicular to the outside surface to determine the minimum wall thickness.
  • Measurements may be recorded as single or sum values and can use contact (mechanical/electronic) or non-contact (electronic/pneumatic) gauges.
• Measurement schemes
  • Circumferential line measurements, axial (Method A and Method B) and point-by-point measurements (one-, two-, three- or six-point schemes) are specified.
  • Measuring lines/points (M1, M2) and distances to measuring positions are defined depending on bearing width (B) and nominal outside diameter (D).
  • For eccentric bores, wall-thickness variation is characterized by angle α (default α = 25° if not otherwise defined).
• Flange thickness
  • Flange thickness measurement uses a micrometer with spherical or needle probes. Surfaces must be clean (free of dust/grease).
  • A three-point measuring scheme for flange thickness is recommended.
• Measuring equipment requirements
  • Outside-surface measuring-pin tip radius: 3.0 mm ± 0.2 mm.
  • Inside-surface tip radius, measuring pin load, setup, periodic control and failure handling are specified (inside tip radius varies with nominal diameter and lining material - see Table 5 in the standard).
• Grading and reporting
  • Grading is referenced to measuring points in the crown; when multiple crown measurements are taken, grading uses the highest wall-thickness value.

Applications and users

• Primary users: plain bearing manufacturers, quality control and metrology labs, OEMs, inspection and acceptance teams.
• Sectors: automotive, aerospace, heavy machinery, marine, power generation and industrial equipment where reliable plain-bearing clearance is critical.
• Use cases: production inspection, incoming supplier checks, acceptance testing, warranty dispute resolution, design verification and maintenance/replacement qualification.

Related standards

• ISO 3548-1 - Thin-walled half bearings: tolerances, design features and test methods.
• ISO 12301 - Referenced for checking procedures.

Keywords: ISO 3548-2:2020, plain bearings, thin-walled half bearings, wall thickness measurement, flange thickness, measuring methods, bearing inspection, metrology, quality control.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2021
Nadomešča:
SIST ISO 3548-2:2010
Drsni ležaji - Tankosteni polovični ležaji s prirobnico ali brez nje - 2. del: Merjenje
debelin stene in prirobnice
Plain bearings - Thin-walled half bearings with or without flange - Part 2: Measurement of
wall thickness and flange thickness
Paliers lisses - Demi-coussinets minces à ou sans collerette - Partie 2: Mesurage de
l'épaisseur de paroi et de l'épaisseur de collerette
Ta slovenski standard je istoveten z: ISO 3548-2:2020
ICS:
21.100.10 Drsni ležaji Plain bearings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 3548-2
Second edition
2020-09
Plain bearings — Thin-walled half
bearings with or without flange —
Part 2:
Measurement of wall thickness and
flange thickness
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definition . 1
4 Symbols and units . 2
5 Purpose of checking . 2
6 Checking methods . 3
6.1 Measuring principle of wall thickness . 3
6.2 Line measurement around the circumference . 3
6.3 Line measurement in axial direction . 4
6.4 Point measurement . 5
6.5 Grading of bearings . 7
6.6 Eccentric bore . 7
6.7 Measuring principle for flange thickness . 7
6.8 Measuring point for flange thickness . 7
7 Requirements for measuring equipment and specimen for the contact method.8
7.1 Tip-radius for measuring pin on the outside surface . 8
7.2 Tip-radius for measuring pin on the inside surface . 8
7.3 Measuring pin load . 8
7.4 Set-up . 8
7.5 Periodical control. 8
7.6 Measurement failures on the inside and/or outside surface . 9
8 Checking of measuring equipment . 9
Bibliography .10
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.
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 documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade 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 5,
Quality analysis and assurance.
This second edition cancels and replaces the first edition (ISO 3548-2:2009), which has been technically
revised. The main changes compared to the previous edition are as follows:
— the term “flange thickness” has been introduced in Clause 3;
— Table 1 has been updated;
— several figures have been revised;
— a new Table 3 “Thin walled half bearings with flange — Distance to measuring position a ” has
ch
been introduced.
A list of all parts in the ISO 3548 series can be found on the ISO website.
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 © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 3548-2:2020(E)
Plain bearings — Thin-walled half bearings with or
without flange —
Part 2:
Measurement of wall thickness and flange thickness
1 Scope
This document specifies in accordance with ISO 12301 the checking of the wall-thickness of thin-walled
half bearings with or without flange and describes the necessary checking methods and measuring
equipment.
It applies to a maximum bearing diameter of 150 mm. It can be applied to a bigger diameter, provided
that there is an agreement between the supplier and the user.
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 3548-1, Plain bearings — Thin-walled half bearings with or without flange — Part 1: Tolerances, design
features and methods of test
3 Terms and definition
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
For the purposes of thisdocument, the following definitions apply:
3.1
wall thickness
s
radial distance between the opposing measuring points at the inner and outer cylindrical surfaces
Note 1 to entry: See Figure 1.
Figure 1 — Wall thickness, s , of a half bearing
3.2
measuring point
agreed point es
...

INTERNATIONAL ISO
STANDARD 3548-2
Second edition
2020-09
Plain bearings — Thin-walled half
bearings with or without flange —
Part 2:
Measurement of wall thickness and
flange thickness
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definition . 1
4 Symbols and units . 2
5 Purpose of checking . 2
6 Checking methods . 3
6.1 Measuring principle of wall thickness . 3
6.2 Line measurement around the circumference . 3
6.3 Line measurement in axial direction . 4
6.4 Point measurement . 5
6.5 Grading of bearings . 7
6.6 Eccentric bore . 7
6.7 Measuring principle for flange thickness . 7
6.8 Measuring point for flange thickness . 7
7 Requirements for measuring equipment and specimen for the contact method.8
7.1 Tip-radius for measuring pin on the outside surface . 8
7.2 Tip-radius for measuring pin on the inside surface . 8
7.3 Measuring pin load . 8
7.4 Set-up . 8
7.5 Periodical control. 8
7.6 Measurement failures on the inside and/or outside surface . 9
8 Checking of measuring equipment . 9
Bibliography .10
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.
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 documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade 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 5,
Quality analysis and assurance.
This second edition cancels and replaces the first edition (ISO 3548-2:2009), which has been technically
revised. The main changes compared to the previous edition are as follows:
— the term “flange thickness” has been introduced in Clause 3;
— Table 1 has been updated;
— several figures have been revised;
— a new Table 3 “Thin walled half bearings with flange — Distance to measuring position a ” has
ch
been introduced.
A list of all parts in the ISO 3548 series can be found on the ISO website.
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 © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 3548-2:2020(E)
Plain bearings — Thin-walled half bearings with or
without flange —
Part 2:
Measurement of wall thickness and flange thickness
1 Scope
This document specifies in accordance with ISO 12301 the checking of the wall-thickness of thin-walled
half bearings with or without flange and describes the necessary checking methods and measuring
equipment.
It applies to a maximum bearing diameter of 150 mm. It can be applied to a bigger diameter, provided
that there is an agreement between the supplier and the user.
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 3548-1, Plain bearings — Thin-walled half bearings with or without flange — Part 1: Tolerances, design
features and methods of test
3 Terms and definition
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
For the purposes of thisdocument, the following definitions apply:
3.1
wall thickness
s
radial distance between the opposing measuring points at the inner and outer cylindrical surfaces
Note 1 to entry: See Figure 1.
Figure 1 — Wall thickness, s , of a half bearing
3.2
measuring point
agreed point established to facilitate agreement on checking
Note 1 to entry: The establishment of measuring points (lines) does not preclude the need to comply with
dimensional specifications in other areas.
3.3
measuring line
agreed line established to facilitate agreement on checking
Note 1 to entry: The establishment of measuring lines does not preclude the need to comply with dimensional
specifications in other areas.
3.4
tolerance
range between the upper specified limit and t
...