SIST ISO 296:1995

Machine tools -- Self-holding tapers for tool shanks

This second edition cancels and replaces the first edition (ISO 296:1974). Specifies the dimensions of tapers for general use, smaller and larger tapers. The standard sizes of these tapers are given in table 2 (in millimetres) and table 3 (in inches), respectively. Provides for those elements which are threaded, two entirely distinct types of product according to the type of thread, M or UNC (see figures in clause 4).

Machines-outils -- Cônes pour emmanchements d'outils à faible conicité

La présente Norme internationale prescrit les dimensions des cônes à faible conicité de l'ordre de 4 % ou 5 %, pour emmanchements d'outils classés, suivant leur emploi, en trois catégories, à savoir a) cônes d'usage courant; b) cônes plus petits; c) cônes plus grands. Pour la première catégorie, les cônes retenus par l'ISO sont les cônes Morse nos 1 à 6, dont les dimensions normalisées, en millimètres, figurent dans le tableau 2, et les dimensions correspondantes, en inches, dans le tableau 3. Pour les cônes plus petits et plus grands, les cônes retenus par l'ISO sont, d'une part les cônes métriques 5 % nos 4 et 6 et le cône Morse no0, et d'autre part les cônes métriques 5 % nos 80 à 200, dont les dimensions, en millimètres seulement, sont données dans le tableau 2. Toutefois, il a été admis de prévoir en parallèle, dans la catégorie des petits cônes, les cônes Brown & Sharpe nos 1 à 3, dont les dimensions, en inches seulement, sont données dans le tableau 3. En conséquence, comme le fait ressortir le tableau 1, les cônes faisant l'objet de la présente Norme internationale comprennent a) pour les usages courants, les seuls cônes Morse nos 1 à 6; b) pour les dimensions au-dessous du cône Morse no1, deux solutions constituées, d'une part, par l'ensemble des cônes métriques nos 4 et 6 et du cône Morse no0 (sans correspondance dans le tableau 3 des valeurs en inches), et, d'autre part, en variante, par l'ense 906mble des cônes Brown & Sharpe nos 1 à 3 (sans correspondance dans le tableau 2 des valeurs en millimètres); c) pour les dimensions supérieures au cône Morse no6, les seuls cônes métriques nos 80 à 200 (sans correspondance dans le tableau 3 des valeurs en inches). La présente Norme internationale prévoit, pour ceux des éléments qui comportent un filetage, deux e

Strojna orodja - Samozaporna konična držala orodij

General Information

• Status: Published
• Publication Date: 31-Oct-1995
• ICS: 25.060.20 - Dividing and tool-workpiece holding devices
• Technical Committee: I12 - Imaginarni 12 Imaginarni TC za ISO področje - vzdrževani privzeti ISO standardi
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Nov-1995
• Due Date: 01-Nov-1995
• Completion Date: 01-Nov-1995
• Ref Project: ISO 296:1991 - Machine tools - Self-holding tapers for tool shanks

Relations

• Revised: ISO 296:1974 - Machine tools - Self-holding tapers for tool shanks
• Effective Date: 14-Aug-2008

Overview

SIST ISO 296:1995 is an international standard published by the International Organization for Standardization (ISO) that specifies the dimensions and technical requirements for self-holding tapers used on tool shanks in machine tools. This second edition, published in 1991, cancels and replaces the first edition from 1974, offering a comprehensive technical revision to address a wider range of taper sizes and applications.

Self-holding tapers are crucial components in machining processes because they provide a secure and precise connection between cutting tools and machine spindles. ISO 296 ensures uniformity and interchangeability of self-holding tapers worldwide, facilitating compatibility and improving machining accuracy.

Key Topics

• Scope and Classification
  ISO 296 classifies self-holding tapers into three main categories based on size and use:

  • Tapers for general use (Morse tapers Nos. 1 to 6)
  • Smaller tapers (metric Nos. 4 and 6, as well as No. 0 Morse taper and Brown & Sharpe tapers Nos. 1 to 3)
  • Larger tapers (metric Nos. 80 to 200)

• Dimensions and Tables
  The standard provides detailed dimensions in millimetres (Table 2) and inches (Table 3), ensuring accurate reference for global manufacturing and engineering. It includes specifications for diameter, length, taper ratio, thread types (metric M and UNC), and tolerances.

• Thread Variants
  For threaded elements, ISO 296 distinguishes between two thread systems-Metric (M) and Unified National Coarse (UNC)-with specific symbols for identification. This specification aids in avoiding interchangeability issues, ensuring correct tool mounting with compatible threading.

• Conicity and Tolerances
  Taper angles and tolerances conform to ISO 1947 standards on conical tolerances (quality AT5), guaranteeing precise fit and consistent performance. Positive tolerance applies to external tapers, while negative tolerance applies to internal tapers. Alternative tolerances can be chosen for special applications.

• Coolant Supply Features
  The standard also defines dimensions for grooves and holes specifically designed to accommodate coolant supply through the taper connection, enhancing tool life and machining efficiency.

Applications

SIST ISO 296:1995 is essential for manufacturers, designers, and users of machine tools and cutting tools. Its practical applications include:

• Machine Tool Industry
  Enables standardized manufacturing of tool holders and shanks, promoting tool interchangeability across different machine brands and types.

• Precision Machining
  Assures high-precision tool fitting and secure gripping to reduce tool runout and vibration, improving machining quality.

• Maintenance and Repair
  Simplifies replacement and repair of tool shanks and holders with standardized tapers, reducing downtime.

• Coolant-Through Tools
  Facilitates implementation of advanced coolant supply systems within tool shanks, enhancing thermal management during cutting operations.

• Global Supply Chain
  Supports manufacturers and suppliers by providing a globally recognized reference for taper dimensions and thread types, ensuring international compatibility.

Related Standards

• ISO 1947 - System of cone tolerances for conical workpieces, referenced for defining the tolerances on conicity used in ISO 296.
• ISO/TC 39 - The technical committee responsible for machine tools standardization, under which ISO 296 was developed.
• Brown & Sharpe Taper Standards - Related inch-based taper standards included within ISO 296 for smaller tapers.
• Morse Taper Standards - Widely used taper system for general applications, standardized in this document with metric and inch sizes.

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Keywords: ISO 296, self-holding tapers, tool shanks, machine tools, taper dimensions, Morse taper, Brown & Sharpe taper, taper tolerances, tool holder standards, machining precision, coolant-through tools, metric and UNC thread tapers, taper interchangeability.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Machines-outils -- Cônes pour emmanchements d'outils à faible conicitéMachine tools -- Self-holding tapers for tool shanks25.060.20Delilniki in vpenjala za orodja in obdelovanceDividing and tool-workpiece holding devicesICS:Ta slovenski standard je istoveten z:ISO 296:1991SIST ISO 296:1995en01-november-1995SIST ISO 296:1995SLOVENSKI
STANDARD
INTERNATIONAL STANDARD ISO 296 Second edition 1991-04-01 Machine tools - Self-holding tapers for tool shanks Machines-outils - C6nes pour emmanchements d’outils a faible conicite Reference number ISO 296:1991(E) SIST ISO 296:1995

INTERNATIONAL STANDARD ISO 296:1991 (E) Machine tools - Self-holding tapers for tool shanks 1 Scope This International Standard specifies the dimensions of self-holding tapers for tool shanks with a small taper of about 4 % to 5 %, classified, according to their use, into the three following catergories: a) tapers for general use; b) smaller tapers; c) larger tapers. For the first category, tapers recommended by ISO are Nos. 1 to 6 Morse tapers. Their Standard sizes in millimetres are given in table 2, and the corre- sponding sizes in inches are given in table 3. For smaller and larger tapers, those recommended by ISO are, on the one hand, Nos. 4 and 6 metric 5 % tapers and No. 0 Morse taper, and on the other hand, Nos. 80 to 200 metric 5 % tapers, the sizes of which, in millimetres only, are given in table2. However, it was agreed to include in parallel, in the category of small tapers, Nos. 1 to 3 Brown & Sharpe tapers, the sizes of which, in inches only, are given in table 3. Consequently, as shown in table 1, the self-holding tapers dealt with
...

ISO
INTERNATIONAL
STANDARD 296
Second edition
1991-04-01
Machine tools - Self-holding tapers for tool
shanks
C6nes pour emmanchements d’outils a faible conicite
Machines-outils -
Reference number
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. Esch 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, govern-
mental and non-governmental, in liaison with ISO, also take patt in the
work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an Interna-
tional Standard requires approval by at least 75 % of the member bodies
casting a vote.
International Standard ISO 296 was prepared by Technical Committee
ISO/TC 39, Machine fools.
This second edition cancels and replaces the first edition
(ISO 296:1974), of which it constitutes a technical revision.
0 ISO 1991
All rights reserved. No part of this publication may be reproduced or utilized in any form
or by any means, electronie or mechanical, including photocopying and microfilm, without
Permission in writing from the publisher.
International Organization for Standardization
land
Case Postale 56 l CH-121 1 Geneve 20 l Switzer
Printed in Switzerland
ii
INTERNATIONAL STANDARD ISO 296:1991 (E)
Self-holding tapers for tool shanks
Machine tools -
1 Scope
Table 1 - Tapers
Sizes in
Designation Sizes in inches
millimetres
This International Standard specifies the dimensions
Nos. 4 and 6
Nos. 1 to 3
of self-holding tapers for tool shanks with a small
Small tapers metric and No.
Brown & Sharpe
taper of about 4 % to 5 %, classified, according to
0 Morse
/
their use, into the three following catergories:
Tapers for gen-
Nos. 1 to 6 Morse’)
a) tapers for general use;
eral use
b) smaller tapers;
Nos. 80 to 200
-
Large tapers
metric
~~~ ~ ~~
c) larger tapers.
1) Except for threads, Nos. 1 to 6 Morse tapers,
manufactured either to metric values or to inch val-
For the first category, tapers recommended by ISO
ues, are strictly interchangeable, though not abso-
are Nos. 1 to 6 Morse tapers. Their Standard sizes
lutely identical.
in millimetres are given in table 2, and the corre-
sponding sizes in inches are given in table 3.
This International Standard provides, for those ele-
For smaller and larger tapers, those recommended
ments which are threaded, two entirely distinct
by ISO are, on the one hand, Nos. 4 and 6 metric
types of product according to the type of thread, M
5 % tapers and No. 0 Morse taper, and on the other
or UNC.
hand, Nos. 80 to 200 metric 5 % tapers, the sizes of
which, in millimetres only, are given in table2.
In Order to distinguish between those two types, it is
However, it was agreed to include in parallel, in the
important that the element itself be marked with the
category of small tapers, Nos. 1 to 3 Brown & Sharpe
corresponding thread Symbol and the type of taper
tapers, the sizes of which, in inches only, are given
Symbol, as shown in the figures in clause 4.
in table 3.
Lastly, this International Standard specifies the di-
Consequently, as shown in table 1, the self-holding
mensions of grooves and holes necessary for the
tapers dealt with in this International Standard in-
design of tapers for applications where coolant sup-
clude
ply is required.
a) for general use, only Nos. 1 to 6 Morse tapers;
b) for sizes below No. 1 Morse taper, two solutions,
2 Normative reference
i.e. either Nos. 4 and 6 metric tapers and No. 0
Morse taper (without corresponding tapers in
The following Standard contains provisions which,
inches in table 3) or, alternatively, Nos. 1 to 3
through reference in this text, constitute provisions
Brown & Sharpe tapers (without corresponding
of this International Standard. At the time of publi-
tapers in millimetres in table2);
cation, the edition indicated was valid. All Standards
are subject to revision, and Parties to agreements
c) for sizes above No. 6 Morse taper, only Nos. 80
based on this International Standard are encour-
to 200 metric tapers (without corresponding ta-
aged to investigate the possibility of applying the
pers in inches in table 3).
most recent edition of the Standard indicated below.

Members of IEC and ISO maintain registers of cur-
3 Conicity tolerantes
rently valid International Standards.
The cone angle tolerantes shall be those given in
ISO 1947:1973, System of cone folerances for conical
ISO 1947 for quality AT5, and shall be positive on the
workpieces from C = 1:3 to 1.500 and lengths from
extemal taper and negative on the internal taper.
6 to 630 mm.
For special applications, other coole angle toler-
ances in accordance with ISO 1947 may be Chosen.

4 Dimensions
Tolerantes of symmetry in miliimetres
Extemal taper with tenon - Type BE
lnternal taper with tenon - Type BI
Gau ge plane
h (6
Internal taper with tapped hole - Type Al External taper with tapped hole - Type AE
- Gauge plane
//.
----
-
G
7 -tt- eJ.
s /
WGauge plane
N
\o
?
Figure 4
Tolerantes of symmetry in millimetres
Internal taper with tenon and External taper with tenon and
coolant supply - Type BEK
coolant supply - Type BIK
pn (13 dk Taugeplane
ane
b t
-- .-------
-
89 - ~ -
I--- --------
k+\+y
\ .
h
L
1) Optional cap.
External taper with tapped hole
Internal taper with tapped hole
and coolant supply - Type AEK
and coolant supply - Type AIK
Gaug e plane
r*y Gauge plane
Figure 2
Metric
Metric tapers
Morse tapers
tapers
Designation
4 6 0 1 2
3 4 5 6 80
100 120 160 200
I
0,6246: 12 0,598 58 : 12 0,59941: 12 0,602 35 : 12 0,623 26 : 12 0,631 51 : 12 0,625 65 : 12
Taper ratio 1: 20 = 0,05 = 1: 19,212
= 1: 20,047 = 1 : 20,02 = 1: 19,922 = 1: 19,254
=1:19,002 = 1 : 19,18 1 : 20 = 0,05
= 0,05205 = 0,049 88 = 0,04995 = 0,0502 = 0,05194 = 0,052 63
= 0,05214
Externa I D 4
6 9,045 12,065 17,78 23,825
31,267 44,399 63,348 80
100 120 160 200
taper ;, 2 3 3 35
5 5 63 6
...

NORME
INTERNATIONALE
Deuxi&me 6dition
1991-04-01
Machines-outils
- Chines pour emmanchements
d’outils 6 faible conicit
Machine tools - Self-holding tapers for tool shanks
Num&o de reference
IS0 296:1991(F)
IS0 296:1991 (F)
Avant-propos
L’ISO (Organisation internationale de normalisation) est une federation
mondiale d’organismes nationaux de normalisation (comit&s membres
de I’ISO). L’elaboration des Normes internationales est en general
confide aux comites techniques de I’ISO. Chaque comite membre inte-
resse par une etude a le droit de faire partie du comite technique tree
a cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO participent kgalement aux tra-
vaux. L’ISO collabore etroitement avec la Commission electrotechnique
internationale (CEI) en ce qui concerne la normalisation electrotech-
nique.
Les projets de Normes internationales adopt& par les comites techni-
ques sont soumis aux comites membres pour vote. Leur publication
comme Normes internationales requiert I’approbation de 75 % au moins
des comites membres votants.
La Norme internationale IS0 296 a ete elaboree par le comite technique
ISO/TC 39, Machines-outils.
Cette deuxieme edition annule et remplace la premiere edition
(IS0 296:1974), dont elle constitue une revision technique.
6 IS0 1991
Droits de reproduction rthervth. Aucune partie de cette publication ne peut 6tre repro-
duite ni utilis6e sous quelque forme que ce soit et par aucun pro&d& electronique ou
mkcanique, y compris la photocopie et les microfilms, sans I’accord bit de 1’6diteur.
Organisation internationale de normalisation
Case Postale 56 l CH-1211 Genkve 20 l Suisse
Imprime en Suisse
ii
IS0 296:1991 (F)
NORME INTERNATIONALE
Machines-outils - C&es pour emmanchements d’outils A
faible conicitk
c) pour les dimensions superieures au cone Morse
1 Domaine d’application
n”6, les seuls cones metriques nOS80 a 200 (sans
correspondance dans le tableau 3 des valeurs en
inches).
La presente Norme internationale prescrit les cli-
mensions des cones a faible conicite de I’ordre de
4 O/o ou 5 %, pour emmanchements d’outils classes,
suivant leur emploi, en trois categories, A savoir
a) cones d’usage courant;
Tableau 1 - C&es
b) cones plus petits;
Dimensions en Dimensions en
Designation
millim&tres inches
c) cones plus grands.
Metriques nOS4
Brown & Sharpe
Pour la premiere categoric, les cones retenus par
et 6 et Morse
Petits cones
n*S 1 a 3
I’ISO sont les cones Morse nos 1 ti 6, dont les di-
no0
mensions normalisee, en millimetres, figurent dans
le tableau 2, et les dimensions correspondantes, en
Cones d’usage
Morse nOS1 a 61)
inches, dans le tableau 3.
courant
Pour les cones plus petits et plus grands, les cones
Metriques nos 80
-
retenus par I’ISO sont, d’une part les cones metri- Grands cones
a 200
ques 5 % noS4 et 6 et le cone Morse n”0, et d’autre -
part les cones metriques 5 % nos 80 a 200, dont les
1) Sauf pour les filetages, les cones Morse n*s 1 a 6
dimensions, en millimetres seulement, sont don- executes soit conformement aux valeurs metriques,
soit conformement aux valeurs en inches, sont stric-
nees dans le tableau 2. Toutefois, il a ete admis de
tement interchangeables, quoique non absolument
prevoir en parallele, dans la categoric des petits
identiques.
cones, les cones Brown & Sharpe nos 1 a 3, dont les
dimensions, en inches seulement, sont donnees
dans le tableau 3.
La presente Norme internationale prevoit, pour ceux
des elements qui cornportent un filetage, deux exe-
En consequence, comme le fait ressortir le
cutions entierement distinctes, suivant la nature de
tableau 1, les cones faisant I’objet de la presente
ces filetages, M ou UNC.
Norme internationale comprennent
Pour distinguer ces deux executions, il importe de
a) pour les usages courants, les seuls cones Morse
marquer sur l’element lui-meme le symbole de file-
nos 1 a 6;
tage correspondant et l/identification du type de
cbne, comme indique aux figures de I’article 4.
b) pour les dimensions au-dessous du cone Morse
n”1, deux solutions constituees, d’une part, par
Enfin, la presente Norme internationale prevoit les
I’ensemble des cones metriques nos4 et 6 et du
dimensions des gorges et des alesages necessaires
cone Morse no0 (sans correspondance dans le
pour la conception des cones quand I’alimentation
tableau 3 des valeurs en inches), et, d’autre part,
en liquide de coupe est requise.
en variante, par l’ensemble des cones Brown &
Sharpe nOS1 A 3 (sans correspondance dans le
tableau 2 des valeurs en millimetres);

IS0 296:1991 (F)
IS0 1947:1973, Sysfeme de tokrances de conicite
2 Rbfbrence normative
pour pi&es coniques de conicit& C = I:3 A I.500 et
de longueur 6 5 630 mm.
La norme suivante contient des dispositions qui, par
suite de la reference qui en est faite, constituent des
dispositions valables pour la presente Norme inter-
3 Tolbrances de conicit
nationale. Au moment de la publication, l’edition in-
diquee etait en vigueur. Toute norme est sujette a
Les tolerances d’angle de cone doivent etre celles
revision et les parties prenantes des accords fond&
donnees dans I’ISO 1947 pour la qualite AT5, en-
sur la presente Norme internationale sont invitees
tierement positives sur le cone exterieur et nega-
5 rechercher la possibilite d’appliquer I’edition la
tives sur le cone interieur.
plus recente de la norme indiquee ci-apt%. Les
membres de la CEI et de I’ISO possedent le registre
Dans le cas d’applications speciales, les tolerances
des Normes internationales en vigueur A un moment d’angle de cone doivent etre choisies conformement
donne. a I’ISO 1947.
IS0 296:1991 (F)
4 Dimensions
Tolkrances de symbtrie en millim&tres
Emmanchement avec c8ne extbieur
Emmanchement avec c6ne intkrieur
5 tenon type BE
5 tenon type BI
B
,-/r10.21]
*Plan de jau
ge
wan
a
Emmanchement avec c6ne exterieur
Emmanchement avec c6ne intkrieur
5 trou taraudb type AE
5 trou taraud6 type Al
+
, k Plan de jauge
‘Ian de j auge
I
cv
c- \o
I
Figure 1
IS0 296:1991 (F)
ToI&antes de sym&ie en millim&es
Emmanchement avec cane intbrieur 8 tenon et
Emmanchement avec cane extkrieur ;i tenon et
alimentation en liquide de coupe type BIK
alimentation en liquide de coupe type BEK
+ Plan de jauge
hi-l
I
m
de jauge
7-F
1) Bouchon bentuel.
Emmanchement avec cane ext6rieur 5 trou taraudb
Emmanchement avec cdne intbrieur 2 trou taraud6
et alimentation en liquide de coupe type AEK
et alimentation en liquide de coupe type AIK
+---Plan de jauge
,I
r*>Plan deja
we
Figure 2
C6nes Canes mbtriques
Canes Morse
mbtriques
Dbsignation
120 160 200
6 80 100
4 5
2 3
0 1
4 6
0,62565:12
0,62326:12 0,63151:12
0,59941:12 0,60235:12
0,6246:12 0,59858:12
I:20 = 0,05
= 1 : 19,002 = 1 : 19,18
...