ISO/FDIS 4183

Belt drives — Classical and narrow V-belts — Grooved pulleys (system based on datum width)

Cancels and replaces the second edition (1989). Specifies the principal dimensions of grooved pulleys for classical V-belts and narrow V-belts specified in the terminology system based on datum width. It is important that narrow belts are not used with pulleys uniquely designed for classical belts, and, on the other hand, that multiple belt drives are not used with joined V-belts.

Transmissions par courroies — Courroies trapézoïdales classiques et étroites — Poulies à gorges (système basé sur la largeur de référence)

General Information

• Status: Not Published
• ICS: 21.220.10 - Belt drives and their components
• Technical Committee: ISO/TC 41/SC 1 - Friction
• Drafting Committee: ISO/TC 41/SC 1 - Friction
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 22-Oct-2025
• Completion Date: 22-Oct-2025

Relations

• Revises: ISO 4183:1995 - Belt drives — Classical and narrow V-belts — Grooved pulleys (system based on datum width)
• Effective Date: 16-Dec-2023

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/TC 41/SC 1
Belt drives — Classical and narrow
Secretariat: AFNOR
V-belts — Grooved pulleys (system
Voting begins on:
based on datum width)
2025-10-22
Transmissions par courroies — Courroies trapézoïdales
Voting terminates on:
classiques et étroites — Poulies à gorges (système basé sur la
2025-12-17
largeur de référence)
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 41/SC 1
Belt drives — Classical and narrow
Secretariat: AFNOR
V-belts — Grooved pulleys (system
Voting begins on:
based on datum width)
Transmissions par courroies — Courroies trapézoïdales
Voting terminates on:
classiques et étroites — Poulies à gorges (système basé sur la
largeur de référence)
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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 Reference number
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 Preliminary notes . 2
6 Groove angles . 2
7 Dimensions of the groove profiles . 2
8 Datum diameters . 3
8.1 Series of datum diameters .3
8.2 Groove angles in relation to given datum diameters .6
8.3 Minimum datum diameters .6
8.4 Differences between datum diameters of any two grooves .7
9 Quality, surface finish and balancing of pulleys . 7
10 Inspection . 7

iii
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 41, Pulleys and belts (including veebelts),
Subcommittee SC 1, Friction.
This fourth edition cancels and replaces the third edition (ISO 4183:1995), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— addition of Clause 4;
— removal of parameters t for A and B in the Figure 1 along with notes 1 and 2;
— removal of Table 1 since datum width values are also shown in Table 2;
— merging of classical and narrow V-belts under the groove profile column in Table 3, and addition of a new
column titled "Tolerance";
— removal of "for use with V-belts" in the first column heading of Table 4;
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/TC 41/SC 1
Secretariat: AFNOR
Date: 2025-08-20
Belt drives — Classical and narrow V-belts — Grooved pulleys
(system based on datum width)
Transmissions par courroies — Courroies trapézoïdales classiques et étroites — Poulies à gorges (système basé
sur la largeur de référence)
FDIS stage
ISO/DISFDIS 4183:2024(E2025(en)
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 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Phone: + 41 22 749 01 11
E-mail: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ii
ISO/DISFDIS 4183:2025(en)
Contents Page
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 Preliminary notes . 2
6 Groove angles . 2
7 Dimensions of the groove profiles . 2
8 Datum diameters . 4
8.1 Series of datum diameters . 4
8.2 Groove angles in relation to given datum diameters . 7
8.3 Minimum datum diameters . 8
8.4 Differences between datum diameters of any two grooves . 8
9 Quality, surface finish and balancing of pulleys . 8
10 Inspection . 8

iii
ISO/DISFDIS 4183:2024(E2025(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 41, Pulleys and belts (including veebelts),
Subcommittee SC 1, Friction.
This fourth edition cancels and replaces the third edition (ISO 4183:1995), which has been technically revised.
The main changes compared to the previous edition are as follows:
— — addition of Clause 4Clause 4;;
— — removal of parameters t for A and B in the Figure 1Figure 1 along with notes 1 and 2;
— — removal of Table 1Table 1 since datum width values are also shown in Table 2Table 2;;
— — merging of classical and narrow V-belts under the groove profile column in Table 3Table 3,, and
addingaddition of a new column titled "Tolerance";
— — removal of "for use with V-belts" in the first column heading of Table 4Table 4;;
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
iv
Final Draft International Standard ISO/FDIS 4183:2025(en)

Belt drives — Classical and narrow V-belts — Grooved pulleys (system
based on datum width)
1 Scope
This document specifies the principal dimensions of grooved pulleys for classical V-belts (sections Y, Z, A, B,
C, D and E) and narrow V-belts (sections SPZ, SPA, SPB and SPC) specified in the terminology system based on
datum width.
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 3, Preferred numbers — Series of preferred numbers
ISO 254, Belt drives — Pulleys — Quality, finish and balance
ISO 255, Belt drives — Pulleys for V-belts (system based on datum width) — Geometrical inspection of grooves
ISO 1081, Belt drives — V-belts and V-ribbed belts, and corresponding grooved pulleys — Vocabulary
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases fo
...