ISO 2541:2016

Centre drills for centre holes with radius form - Type R

ISO 2541:2016 specifies the dimensions of centre drills for centre holes with radius ? Type R. It covers only metric dimensions, regarded as the only recommended dimensions in the future for this type of drills. The flutes can be straight or spiral at the option of manufacturer. Unless otherwise stated, these drills are right-hand cutting. Annex A gives the recommended dimensions for the centre holes, Type R, which can be obtained by a rational use of the centre drills listed in this International Standard.

Forets à centrer pour centres à profil curviligne — Type R

ISO 2541:2016 fixe les dimensions des forets à centrer pour centre à profil curviligne ? Type R. Elle ne porte que des dimensions métriques, considérées comme seules recommandées, à l'avenir, pour ce type de forets. Les goujures peuvent être droites ou hélicoïdales, à l'initiative du fabricant. Sauf indication contraire, ces forets sont à coupe droite. L'Annexe A donne les dimensions recommandées des centres, Type R, susceptibles d'être obtenus par un emploi rationnel des forets à centrer faisant l'objet de la présente Norme internationale.

Središčni svedri za središčne izvrtine s polmerom - Tip R

Ta mednarodni standard določa dimenzije središčnih svedrov za središčne izvrtine s polmerom – tip R.
Zajema le metrične dimenzije, ki se štejejo kot edine priporočene dimenzije za ta tip svedrov v prihodnosti.
Utori so lahko ravni ali spiralni po izbiri proizvajalca. Če ni navedeno drugače, so ti svedri namenjeni za vrezovanje v desno.
Dodatek A podaja priporočene dimenzije središčnih izvrtin tipa R, ki jih je mogoče pridobiti z racionalno uporabo središčnih svedrov, navedenih v tem mednarodnem standardu.

General Information

• Status: Published
• Publication Date: 23-Oct-2016
• ICS: 25.100.30 - Drills, countersinks, reamers
• Technical Committee: ISO/TC 29/SC 9 - Tools with defined cutting edges, holding tools, cutting items, adaptive items and interfaces
• Drafting Committee: ISO/TC 29/SC 9 - Tools with defined cutting edges, holding tools, cutting items, adaptive items and interfaces
• Current Stage: 9093 - International Standard confirmed
• Start Date: 27-Mar-2023
• Completion Date: 13-Dec-2025
• Ref Project: SIST ISO 2541:2017 - Centre drills for centre holes with radius form - Type R

Relations

• Revises: ISO 2541:1972 - Centre drills for centre holes with radius form - Type R
• Effective Date: 29-Jun-2013

Overview

ISO 2541:2016 defines the dimensions and designation of centre drills for centre holes with a radius form - Type R. The standard covers only metric dimensions, designates drills by type and diameters (example: R 2,5/6,3), and notes that flutes may be straight or spiral at the manufacturer's option. Unless stated otherwise, these drills are right‑hand cutting. Annex A provides recommended dimensions for the matching centre holes; Annex B maps designations to the ISO 13399 cutting‑tool data representation scheme.

Key Topics

• Scope and designation
  • Specifies Type R centre drills and how to designate them (Type R, pilot diameter, shank diameter).
• Dimensional data
  • Provides nominal metric sizes (pilot diameters and matching shank diameters), overall lengths, usable lengths and radii in a tabulated format. Some sizes are shown in brackets and “should be avoided whenever possible.”
• Tolerances and geometry
  • Machine‑side tolerance classes and common tolerances (e.g., h9 for shank fits) are referenced; the standard also specifies point geometry (120° point angle indicated in figures).
• Manufacturing options
  • Flutes may be straight or spiral; drills are generally right‑hand cutting unless otherwise specified.
• Supporting information
  • Annex A (normative) gives recommended centre‑hole dimensions for Type R.
  • Annex B (informative) provides relationships between ISO 2541 designations and ISO 13399 symbols for data exchange.

Applications

ISO 2541:2016 is practical for professionals and organizations involved in:

• Tool manufacturers specifying and producing centre drills to standardized dimensions.
• Tooling suppliers and procurement ensuring compatible drill sizes and shank fits for lathes and turning centers.
• Machine shops and CNC programmers using centre drills to create accurate centre holes for turning between centers, workholding, and setup operations.
• Quality, inspection and metrology teams verifying drill dimensions, fits and tolerances against a recognized international standard.
• Design and engineering departments that include centre‑hole geometry in part and fixture designs.

Using ISO 2541:2016 helps ensure interchangeability, predictable fit between drill and workpiece, and consistent setup practices across suppliers and workshops.

Related Standards

• ISO 13399 (all parts) - cutting tool data representation and exchange (relationship provided in Annex B)
• ISO 866 - centre drills Type A (without protecting chamfers)
• ISO 2540 - centre drills Type B (with protecting chamfer)

Keywords: ISO 2541:2016, centre drills, Type R, centre holes, metric dimensions, flutes straight spiral, right‑hand cutting, pilot diameter, shank diameter, ISO 13399, cutting tools, machining.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2017
1DGRPHãþD
SIST ISO 2541:1995
6UHGLãþQLVYHGUL]DVUHGLãþQHL]YUWLQHVSROPHURP7LS5
Centre drills for centre holes with radius form - Type R
Forets à centrer pour centres à profil curviligne - Type R
Ta slovenski standard je istoveten z: ISO 2541:2016
ICS:
25.100.30 Svedri, greznila, posnemalna Drills, countersinks, reamers
orodja
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 2541
Second edition
2016-11-01
Centre drills for centre holes with
radius form — Type R
Forets à centrer pour centres à profil curviligne — Type R
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2016 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Designation . 1
3 Dimensions . 1
Annex A (normative) Dimensions for centre hole — Type R . 3
Annex B (informative) Relationship between designations in this International Standard
and ISO 13399 (all parts) . 4
Bibliography . 5
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
...

INTERNATIONAL ISO
STANDARD 2541
Second edition
2016-11-01
Centre drills for centre holes with
radius form — Type R
Forets à centrer pour centres à profil curviligne — Type R
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2016 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Designation . 1
3 Dimensions . 1
Annex A (normative) Dimensions for centre hole — Type R . 3
Annex B (informative) Relationship between designations in this International Standard
and ISO 13399 (all parts) . 4
Bibliography . 5
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 expla
...

NORME ISO
INTERNATIONALE 2541
Deuxième édition
2016-11-01
Forets à centrer pour centres à profil
curviligne — Type R
Centre drills for centre holes with radius form — Type R
Numéro de référence
©
ISO 2016
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2016, Publié en Suisse
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni utilisée
sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie, l’affichage sur
l’internet ou sur un Intranet, sans autorisation écrite préalable. Les demandes d’autorisation peuvent être adressées à l’ISO à
l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2016 – Tous droits réservés

Sommaire Page
Avant-propos .iv
Introduction .v
1 Domaine d’application . 1
2 Désignation . 1
3 Dimensions . 1
Annexe A (normative) Dimensions des centres — Type R. 3
Annexe B (informative) Relation entre les désignations dans la présente Norme
internationale et l’ISO 13399 (toutes les parties) . 4
Bibliographie . 5
Avant-propos
L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes
nationaux de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est
en général confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude
a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,
gouvernementales et non gouvernementales, en liaison avec l’ISO participent également aux travaux.
L’ISO collabore étroitement avec la Commission électrotechnique internationale (IEC) en ce qui
concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier de prendre note des différents
critères d’approbation requis pour les différents types de documents ISO. Le présent document a été
rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir www.
iso.org/directives).
L’attention est appelée sur le fait que certains des éléments du présent document peuvent faire l’objet de
droits de propriété intellectuelle ou de droits analogues. L’ISO ne saurait être tenue pour responsable
de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant
les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de
l’élaboration du document sont indiqués dans l’Introduction et/ou dans la liste des déclarations de
brevets reçues par l’ISO (voir www.iso.org/brevets).
Les appellations commerciales éventuellement mentionnées dans le présent document sont données
pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un
engagement.
Pour une explication de la signification des
...