SIST ISO 5408:1998
(Main)Cylindrical screw threads -- Vocabulary
Cylindrical screw threads -- Vocabulary
Provides fundamental terms and definitions in English and French applicable to threads with profiles (in an axial plane) based on triangles; a list of Russian equivalent terms is given in annex A; the annexes B and C include the equivalent terms in German and Italian.
Filetages cylindriques -- Vocabulaire
Metrski navoj - Slovar
General Information
Relations
Standards Content (Sample)
5408
International Standard
Norme internationale
INTERNATIONAL ORGANIZATION FOR STANDARDiZATIONWlE)I(L1YHAPOAHAR OPrAHM3Al.lMR l-l0 CTAH~APTH3A~WM.ORGANISATION INTERNATIONALE DE NORMALISATION
Cylindrical screw threads - Vocabulary
First edition - 1983-12-15
Filetages cylindriques - Vocabulaire
Premiere Edition - 1983-12-15
z
\
UDC/CDU 621.882.082 : 001.4 Ref. No./Mf. no : lSO5408=1983(E/F)
Lu
-
filetage, filetage ISO, vocabulaire.
Descriptors : screw threads, ISO screw threads, vocabulary. / Descripteurs :
0
Ul
Price based on 10 pages/Prix bask sur IO pages
---------------------- Page: 1 ----------------------
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards bodies (ISO member bedies). The work of developing International
Standards is carried out through ISO technical committees. Every member body
interested in a subject for which a technical committee has been authorized 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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council.
International Standard ISO 5408 was developed by Technical Committee ISO/TC 1,
Screw threads, and was circulated to the member bodies in July 1982.
lt has been approved by the member bodies of the following countries:
Australia
Hungary Poland
Austria India Romania
Canada Ireland South Africa, Rep. of
Denmark Italy Sweden
Egypt, Arab Rep. of Korea, Rep. of Switzerland
France Netherlands United Kingdom
Germany, F.R. Norway USSR
The member bodies of the following countries expressed disapproval of the document
on technical grounds :
Belgium
Japan
Spain
USA
@ International Organkation for Standardkation, 1983 0
Printed in Switzerland
ii
---------------------- Page: 2 ----------------------
Avant-propos
L’ISO (Organisation internationale de normaiisation) est une federation mondiale
d’organismes nationaux de normalisation (comites membres de WO). L’elaboration
des Normes internationales est confiee aux comites techniques de I’ISO. Chaque
comite membre interesse par une etude a Ie droit de faire Partie du comite technique
correspondant. Les organisations internationales, gouvernementales et non gouverne-
mentales, en liaison avec I’ISO, pafticipent egalement aux travaux.
Les projets de Normes internationales adoptes par les comites techniques sont soumis
aux comites membres pour approbation, avant leur acceptation comme Normes inter-
nationales par Ie Conseil de I’ISO.
La Norme in ternationale ISO 5408 a etc ela boree par Ie comite technique
ISO/TC 1,
Fide tages, et a et6 soumise aux comites membres en juil let 1982.
Les comites membres des pays suivants I’ont approuvee:
Afrique du Sud, Rep. d’ Egypte, Rep. arabe d’ Pays-Bas
Allemagne, R. F.
France Pologne
Australie Hongrie Roumanie
Autriche Inde Royaume-Uni
Canada Irlande Suede
Corde, Rep. de I talie Suisse
Danemark Norvhge URSS
raisons
Les comites membres des pays suivants I’ont desapprouvee pour des
techniques :
Belgique
Espagne
Japon
USA
0 Organisation internationale de normalisation, 1983
Imptimt5 en Suisse
. . .
Ill
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This page intentionally left blank
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INTERNATIONAL STANDARD
ISO 54084983 (E/F)
NORME INTERNATIONALE
Filetages cylindriques -
Cylindrical screw
- Vocabulary Vocabulaire
threads
1 Objet et domaine d’application
1 Scope and field of application
La presente Norme internationale definit des termes fondamen-
This International Standard provides fundamental terms and
taux en anglais et en francais, applicables aux filetages cylindri-
definitions in English and French applicable to cylindrical screw
threads with profiles (in an axial plane) based on triangles. A list ques dont les profils (dans un plan axial) sont bases sur des
triangles. Une liste de termes russes equivalents est donnee
of Russian equivalent terms is given in annex A.
dans I’annexe A.
NOTE - In addition to terms used in the three official ISO languages
(English, French and Russian), this International Standard gives in NOTE - En Supplement aux termes donnes dans les trois langues offi-
annexes B and C, the equivalent terms in German and Italian; these
cielles de I’ISO (anglais, francais, russe), Ia presente Norme internatio-
have been included at the request of the technical committee nale donne, dans les annexes B et C, les termes Äquivalents en alle-
ISO/TC 1, and are published under the responsibility of the member
mand et en italien; ces termes ont et6 inclus Zr Ia demande du comite
bodies for Germany, F.R. (DIN) and Italy (UNI). However, only the technique ISO/TC 1, et sont publies sous Ia responsabilite des comites
terms given in the official languages tan be considered as ISO terms. membres de I’Allemagne, R.F. (DIN) et de I’ltalie (UNI). Toutefois,
seuls les termes donnes dans les langues officielles peuvent etre consi-
deres comme termes ISO.
2 Termes geom&riques et genkaux
2 Geometrical and general terms
2.1 h4ice : Courbe sur une surface cylindrique de revolution
2.1 helix : A curve on a right, circular cylindrical surface,
droite qui coupe sous un angle constant, different de 0 ou 7c/2
intersecting the generators of the surface at constant angles
radians, les generatrices de Ia surface (voir figure 1).
other than 0 or 7i/2 radians (see figure 1).
NOTES
NOTES
1 L’axe de Ia surface cylindrique est aussi I’axe de I’helice.
1 The axis of the cylindrical surface is also the axis of the helix.
2 If the cylindrical surface is tut along a straight line generator and 2 Si I’on coupe Ia surface cylindrique Ie long d’une generatrice et Ia
developpe dans un plan, I’helice se presentera sous forme de droites
then developed flat onto a plane, the helix will appear as a number of
inclinees et paralleles.
inclined, straight, parallel lines.
3 Terms 2.1, 2.2, 2.3 and figure 1 define general helix Parameters 3 Les termes 2.1, 2.2, 2.3 et Ia figure 1 definissent des parametres
generaux de I’helice et ne doivent pas etre confondus avec les parame-
which shall not be confused with Parameters applicable to a screw
tres se rappot-tant a un filetage.
thread.
4 The terms “cylinder” and “cylindrical surface”, when used in this 4 Dans Ia presente Norme internationale les termes «cy/indre et sur-
face cykndrigue)) sont employes a Ia place des termes complets «cy/in-
International Standard stand for “right circular cylinder” and “right cir-
cular cylinder sutiace” respectively. dre de r&olution droit et surface cylindrique de rbolution droite».
1
---------------------- Page: 5 ----------------------
ISO 54084983 (E/F)
Developed cylindrical surface
Axis
Surface cylindrique developpee
r Axe
P
tan (0 =r--
Lead Lead angle angle
Inclinaison Inclinaison
Helix Helix
Helice 44.
.
73
.c
8:
Q
Cylinder Cylinder J/
. Jn
Cylindre Cylindre --
Lead angle
- Inclinaison
Figure 1 - Helix
Figure ‘l - Helice
The axial distance (Ph in figure 1) be- 2.2 pas de I’helice; pas helicoidal : Distance axiale (ph a Ia
2.2 lead of a helix :
tween two consecutive Points of intersection of a helix by a figure 1) entre deux Points d’intersections consecutifs de
straight line generator of the cylinder on which it lies; i.e. the I’helice avec une generatrice de Ia surface cylindrique, c’est-a-
dire distance axiale parcourue par un Point de I’helice au cours
axial movement of a Point following the helix one turn around
its axis. d’une revolution.
The acute angle (p in figure 1) 2.3 angle d’inclinaison de I’helice : Angle aigu (p a Ia
2.3 Iead angle of a helix :
figure 1) entre Ia tangente a une helice et un plan perpendicu-
between the tangent of a helix and a plane perpendicular to the
laire a l’axe du cylindre sur lequel elle est tracee, c’est-a-dire
axis of the cylinder on which it lies; i.e. the angle whose
i’ vided by the circumference I’angle dont Ia tangente est egale au pas de l’helice divise par Ia
tangent is equal to the helix lead d
ph ph
lies, tan fj9 = - circonference du dit cylindre, tan p = -
of the cylinder on which the helix
nd xd
2.4 screw thread : A continuous and projecting helica
2.4 filet; filetage : Saillie helicoi’dale continue et de section
ridge of uniform section on a cylindrical surface.
uniforme sur une surface cylindrique.
NOTE - In fact, every Point on a thread follows its own helix. All thc
NOTE - En realite, chaque Point sur un filet suit sa propre helice.
helices have a common axis, the thread axis, and the same lead, but
Toutes les helices ont un axe commun, I’axe du filet, et Ie meme pas
the tangent of the lead angle is inversely proportional to the radial
helicoidal, mais Ia tangente de I’angle d’inclinaison est inversement
distance from the helix to the axis.
proportionelle a Ia distance radiale entre l’helice et I’axe.
I
2.5 extemal thread, bolt thread : A screw thread formed 2.5 filetage exterieur; filetage de Ia vis : Filetage res ise
sur I’exterieur d’une surface cylindrique (voir figure 2).
on the outside of a cylindrical surface (see figure 2).
L ’
2.6 internal thread, nut thread : A screw thread formed on 2.6 filetage interieur; filetage de I’ecrou; taraudage .
Filetage realise sur I’interieur d’une surface cylindrique (voir
the inside of a cylindrical surface (see figure 3).
figure 3).
2.7 right-hand thread : A screw thread that is screwed in or 2.7 filetage a droite : Filetage d’une piece filetee qui est vis-
on clockwise (see figures 2 and 3). sec dans Ie sens des aiguilles d’une montre (voir figures 2 et 3).
2
---------------------- Page: 6 ----------------------
ISO 54084983 WF)
Single-Start right-hand external thread
Figure 2 - Figure 3 - Single-Start right-hand internal thread
Figure 2 - Filetage exterieur a droite a un seul filet
Figure 3 - Filetage interieur A droite a un seul filet
2.8 left-hand thread : A screw thread that is screwed in or
2.8 filetage A gauehe :
Filetage d’une piece filetee qui est
on counter-clockwise (sec figure 4). vissee dans Ie sens contraire des aiguilles d’une montre (voir
figure 4).
2.9 Single-Start thread : A screw thread with only one Start
2.9 filetage A un seul filet :
Filetage avec seulement un filet
(sec figures 2, 3 and 4). (voir figures 2, 3 et 4).
2.10 multi-start thread : A screw thread with two or more
2.10 filetage fi plusieurs filets : Filetage avec deux ou plus
Starts (sec figure 5). de deux filets (voir figure 5).
Figure 4 - Single-Start left-hand external thread
Figure 5 - Two-Start right-hand external thread
Figure 4 - Filetage exterieur a gauehe a un seul filet Figure 5 -
Filetage exterieur a droite a deux filets
3 Terms relating to screw thread elements
3 Termes relatifs aux 6kments du filetage
3.1 basic Profile : The theoretical Profile of the screw
3.1 Profil de base :
Dans un plan axial, Ie Profil theorique du
thread in an axial plane defined by theoretical dimensions and
filetage defini par des dimensions et des angles theoriques
angles common to internal and extemal threads. As an example
communs pour les filetages interieurs et exterieurs. Par exem-
the basic Profile for ISO metric screw threads is shown in
ple, Ie Profil de base pour les filetages metriques ISO est repre-
figure 6. sente a Ia figure 6.
3.2 fundamental triangle : A triangle from which the shape
3.2 triangle generateur : Triangle a partir duquel Ia forme
and the dimensions of the basic Profile are deduced in a simple
et les dimensions du Profil de base sont deduites de facon sim-
way. The corners of this triangle coincide with three con-
ple. Les sommets de ce triangle coi’ncident avec trois intersec-
secutive intercepts of the extended flanks of the basic Profile.
tions consecutives des droites prolongeant les flancs du Profil
As an example the fundamental triangle for ISO metric screw
de base. Par exemple, Ie triangle generateur pour les filetages
threads is shown in figure 6.
metriques ISO est represente a Ia figure 6.
3
---------------------- Page: 7 ----------------------
Iso 54084983 WF)
Fundamental triangle height
[ Hauteur du triangle generateur
Pitch line
Ligne primitive
Fundamental triangle i Basic Profile
i
Triangle generateur Profil de base
Figure 6 - Fundamental triangle and basic Profile
Figure 6 - Triangle generateur et Profil de base
3.3 design P
...
SLOVENSKI STANDARD
SIST ISO 5408:1998
01-oktober-1998
Metrski navoj - Slovar
Cylindrical screw threads -- Vocabulary
Filetages cylindriques -- Vocabulaire
Ta slovenski standard je istoveten z: ISO 5408:1983
ICS:
01.040.21 Mehanski sistemi in deli za Mechanical systems and
splošno rabo (Slovarji) components for general use
(Vocabularies)
21.040.01 Navoji na splošno Screw threads in general
SIST ISO 5408:1998 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST ISO 5408:1998
---------------------- Page: 2 ----------------------
SIST ISO 5408:1998
5408
International Standard
Norme internationale
INTERNATIONAL ORGANIZATION FOR STANDARDiZATIONWlE)I(L1YHAPOAHAR OPrAHM3Al.lMR l-l0 CTAH~APTH3A~WM.ORGANISATION INTERNATIONALE DE NORMALISATION
Cylindrical screw threads - Vocabulary
First edition - 1983-12-15
Filetages cylindriques - Vocabulaire
Premiere Edition - 1983-12-15
z
\
UDC/CDU 621.882.082 : 001.4 Ref. No./Mf. no : lSO5408=1983(E/F)
Lu
-
filetage, filetage ISO, vocabulaire.
Descriptors : screw threads, ISO screw threads, vocabulary. / Descripteurs :
0
Ul
Price based on 10 pages/Prix bask sur IO pages
---------------------- Page: 3 ----------------------
SIST ISO 5408:1998
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards bodies (ISO member bedies). The work of developing International
Standards is carried out through ISO technical committees. Every member body
interested in a subject for which a technical committee has been authorized 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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council.
International Standard ISO 5408 was developed by Technical Committee ISO/TC 1,
Screw threads, and was circulated to the member bodies in July 1982.
lt has been approved by the member bodies of the following countries:
Australia
Hungary Poland
Austria India Romania
Canada Ireland South Africa, Rep. of
Denmark Italy Sweden
Egypt, Arab Rep. of Korea, Rep. of Switzerland
France Netherlands United Kingdom
Germany, F.R. Norway USSR
The member bodies of the following countries expressed disapproval of the document
on technical grounds :
Belgium
Japan
Spain
USA
@ International Organkation for Standardkation, 1983 0
Printed in Switzerland
ii
---------------------- Page: 4 ----------------------
SIST ISO 5408:1998
Avant-propos
L’ISO (Organisation internationale de normaiisation) est une federation mondiale
d’organismes nationaux de normalisation (comites membres de WO). L’elaboration
des Normes internationales est confiee aux comites techniques de I’ISO. Chaque
comite membre interesse par une etude a Ie droit de faire Partie du comite technique
correspondant. Les organisations internationales, gouvernementales et non gouverne-
mentales, en liaison avec I’ISO, pafticipent egalement aux travaux.
Les projets de Normes internationales adoptes par les comites techniques sont soumis
aux comites membres pour approbation, avant leur acceptation comme Normes inter-
nationales par Ie Conseil de I’ISO.
La Norme in ternationale ISO 5408 a etc ela boree par Ie comite technique
ISO/TC 1,
Fide tages, et a et6 soumise aux comites membres en juil let 1982.
Les comites membres des pays suivants I’ont approuvee:
Afrique du Sud, Rep. d’ Egypte, Rep. arabe d’ Pays-Bas
Allemagne, R. F.
France Pologne
Australie Hongrie Roumanie
Autriche Inde Royaume-Uni
Canada Irlande Suede
Corde, Rep. de I talie Suisse
Danemark Norvhge URSS
raisons
Les comites membres des pays suivants I’ont desapprouvee pour des
techniques :
Belgique
Espagne
Japon
USA
0 Organisation internationale de normalisation, 1983
Imptimt5 en Suisse
. . .
Ill
---------------------- Page: 5 ----------------------
SIST ISO 5408:1998
This page intentionally left blank
---------------------- Page: 6 ----------------------
SIST ISO 5408:1998
INTERNATIONAL STANDARD
ISO 54084983 (E/F)
NORME INTERNATIONALE
Filetages cylindriques -
Cylindrical screw
- Vocabulary Vocabulaire
threads
1 Objet et domaine d’application
1 Scope and field of application
La presente Norme internationale definit des termes fondamen-
This International Standard provides fundamental terms and
taux en anglais et en francais, applicables aux filetages cylindri-
definitions in English and French applicable to cylindrical screw
threads with profiles (in an axial plane) based on triangles. A list ques dont les profils (dans un plan axial) sont bases sur des
triangles. Une liste de termes russes equivalents est donnee
of Russian equivalent terms is given in annex A.
dans I’annexe A.
NOTE - In addition to terms used in the three official ISO languages
(English, French and Russian), this International Standard gives in NOTE - En Supplement aux termes donnes dans les trois langues offi-
annexes B and C, the equivalent terms in German and Italian; these
cielles de I’ISO (anglais, francais, russe), Ia presente Norme internatio-
have been included at the request of the technical committee nale donne, dans les annexes B et C, les termes Äquivalents en alle-
ISO/TC 1, and are published under the responsibility of the member
mand et en italien; ces termes ont et6 inclus Zr Ia demande du comite
bodies for Germany, F.R. (DIN) and Italy (UNI). However, only the technique ISO/TC 1, et sont publies sous Ia responsabilite des comites
terms given in the official languages tan be considered as ISO terms. membres de I’Allemagne, R.F. (DIN) et de I’ltalie (UNI). Toutefois,
seuls les termes donnes dans les langues officielles peuvent etre consi-
deres comme termes ISO.
2 Termes geom&riques et genkaux
2 Geometrical and general terms
2.1 h4ice : Courbe sur une surface cylindrique de revolution
2.1 helix : A curve on a right, circular cylindrical surface,
droite qui coupe sous un angle constant, different de 0 ou 7c/2
intersecting the generators of the surface at constant angles
radians, les generatrices de Ia surface (voir figure 1).
other than 0 or 7i/2 radians (see figure 1).
NOTES
NOTES
1 L’axe de Ia surface cylindrique est aussi I’axe de I’helice.
1 The axis of the cylindrical surface is also the axis of the helix.
2 If the cylindrical surface is tut along a straight line generator and 2 Si I’on coupe Ia surface cylindrique Ie long d’une generatrice et Ia
developpe dans un plan, I’helice se presentera sous forme de droites
then developed flat onto a plane, the helix will appear as a number of
inclinees et paralleles.
inclined, straight, parallel lines.
3 Terms 2.1, 2.2, 2.3 and figure 1 define general helix Parameters 3 Les termes 2.1, 2.2, 2.3 et Ia figure 1 definissent des parametres
generaux de I’helice et ne doivent pas etre confondus avec les parame-
which shall not be confused with Parameters applicable to a screw
tres se rappot-tant a un filetage.
thread.
4 The terms “cylinder” and “cylindrical surface”, when used in this 4 Dans Ia presente Norme internationale les termes «cy/indre et sur-
face cykndrigue)) sont employes a Ia place des termes complets «cy/in-
International Standard stand for “right circular cylinder” and “right cir-
cular cylinder sutiace” respectively. dre de r&olution droit et surface cylindrique de rbolution droite».
1
---------------------- Page: 7 ----------------------
SIST ISO 5408:1998
ISO 54084983 (E/F)
Developed cylindrical surface
Axis
Surface cylindrique developpee
r Axe
P
tan (0 =r--
Lead Lead angle angle
Inclinaison Inclinaison
Helix Helix
Helice 44.
.
73
.c
8:
Q
Cylinder Cylinder J/
. Jn
Cylindre Cylindre --
Lead angle
- Inclinaison
Figure 1 - Helix
Figure ‘l - Helice
The axial distance (Ph in figure 1) be- 2.2 pas de I’helice; pas helicoidal : Distance axiale (ph a Ia
2.2 lead of a helix :
tween two consecutive Points of intersection of a helix by a figure 1) entre deux Points d’intersections consecutifs de
straight line generator of the cylinder on which it lies; i.e. the I’helice avec une generatrice de Ia surface cylindrique, c’est-a-
dire distance axiale parcourue par un Point de I’helice au cours
axial movement of a Point following the helix one turn around
its axis. d’une revolution.
The acute angle (p in figure 1) 2.3 angle d’inclinaison de I’helice : Angle aigu (p a Ia
2.3 Iead angle of a helix :
figure 1) entre Ia tangente a une helice et un plan perpendicu-
between the tangent of a helix and a plane perpendicular to the
laire a l’axe du cylindre sur lequel elle est tracee, c’est-a-dire
axis of the cylinder on which it lies; i.e. the angle whose
i’ vided by the circumference I’angle dont Ia tangente est egale au pas de l’helice divise par Ia
tangent is equal to the helix lead d
ph ph
lies, tan fj9 = - circonference du dit cylindre, tan p = -
of the cylinder on which the helix
nd xd
2.4 screw thread : A continuous and projecting helica
2.4 filet; filetage : Saillie helicoi’dale continue et de section
ridge of uniform section on a cylindrical surface.
uniforme sur une surface cylindrique.
NOTE - In fact, every Point on a thread follows its own helix. All thc
NOTE - En realite, chaque Point sur un filet suit sa propre helice.
helices have a common axis, the thread axis, and the same lead, but
Toutes les helices ont un axe commun, I’axe du filet, et Ie meme pas
the tangent of the lead angle is inversely proportional to the radial
helicoidal, mais Ia tangente de I’angle d’inclinaison est inversement
distance from the helix to the axis.
proportionelle a Ia distance radiale entre l’helice et I’axe.
I
2.5 extemal thread, bolt thread : A screw thread formed 2.5 filetage exterieur; filetage de Ia vis : Filetage res ise
sur I’exterieur d’une surface cylindrique (voir figure 2).
on the outside of a cylindrical surface (see figure 2).
L ’
2.6 internal thread, nut thread : A screw thread formed on 2.6 filetage interieur; filetage de I’ecrou; taraudage .
Filetage realise sur I’interieur d’une surface cylindrique (voir
the inside of a cylindrical surface (see figure 3).
figure 3).
2.7 right-hand thread : A screw thread that is screwed in or 2.7 filetage a droite : Filetage d’une piece filetee qui est vis-
on clockwise (see figures 2 and 3). sec dans Ie sens des aiguilles d’une montre (voir figures 2 et 3).
2
---------------------- Page: 8 ----------------------
SIST ISO 5408:1998
ISO 54084983 WF)
Single-Start right-hand external thread
Figure 2 - Figure 3 - Single-Start right-hand internal thread
Figure 2 - Filetage exterieur a droite a un seul filet
Figure 3 - Filetage interieur A droite a un seul filet
2.8 left-hand thread : A screw thread that is screwed in or
2.8 filetage A gauehe :
Filetage d’une piece filetee qui est
on counter-clockwise (sec figure 4). vissee dans Ie sens contraire des aiguilles d’une montre (voir
figure 4).
2.9 Single-Start thread : A screw thread with only one Start
2.9 filetage A un seul filet :
Filetage avec seulement un filet
(sec figures 2, 3 and 4). (voir figures 2, 3 et 4).
2.10 multi-start thread : A screw thread with two or more
2.10 filetage fi plusieurs filets : Filetage avec deux ou plus
Starts (sec figure 5). de deux filets (voir figure 5).
Figure 4 - Single-Start left-hand external thread
Figure 5 - Two-Start right-hand external thread
Figure 4 - Filetage exterieur a gauehe a un seul filet Figure 5 -
Filetage exterieur a droite a deux filets
3 Terms relating to screw thread elements
3 Termes relatifs aux 6kments du filetage
3.1 basic Profile : The theoretical Profile of the screw
3.1 Profil de base :
Dans un plan axial, Ie Profil theorique du
thread in an axial plane defined by theoretical dimensions and
filetage defini par des dimensions et des angles theoriques
angles common to internal and extemal threads. As an example
communs pour les filetages interieurs et exterieurs. Par exem-
the basic Profile for ISO metric screw threads is shown in
ple, Ie Profil de base pour les filetages metriques ISO est repre-
figure 6. sente a Ia figure 6.
3.2 fundamental triangle : A triangle from which the shape
3.2 triangle generateur : Triangle a partir duquel Ia forme
and the dimensions of the basic Profile are deduced in a simple
et les dimensions du Profil de base sont deduites de facon sim-
way. The corners of this triangle coincide with three con-
ple. Les sommets de ce triangle coi’ncident avec trois intersec-
secutive intercepts of the extended flanks of the basic Profile.
tions consecutives des droites prolongeant les flancs du Profil
As an example the fundamental triangle for ISO metric screw
de base. Par exemple, Ie triangle generateur pour les filetages
threads is s
...
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