EN 148-1:2018

SLOVENSKI STANDARD
01-marec-2019
1DGRPHãþD
SIST EN 148-1:1999
Oprema za varovanje dihal - Navoji na maskah - 1. del: Standardna navojna
povezava
Respiratory protective devices - Threads for facepieces - Part 1: Standard thread
connection
Atemschutzgeräte - Gewinde für Atemanschlüsse - Teil 1: Rundgewindeanschluss
Appareils de protection respiratoire - Filetages pour pièces faciales - Partie 1 :
Connexion à filetage normalisé
Ta slovenski standard je istoveten z: EN 148-1:2018
ICS:
13.340.30 Varovalne dihalne naprave Respiratory protective
devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 148-1
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2018
EUROPÄISCHE NORM
ICS 13.340.30 Supersedes EN 148-1:1999
English Version
Respiratory protective devices - Threads for facepieces -
Part 1: Standard thread connection
Appareils de protection respiratoire - Filetages pour Atemschutzgeräte - Gewinde für Atemanschlüsse - Teil
pièces faciales - Partie 1 : Connexion à filetage 1: Rundgewindeanschluss
normalisé
This European Standard was approved by CEN on 17 September 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 148-1:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms, definitions and symbols . 4
3.1 Terms and definitions . 4
3.2 Symbols . 5
4 Requirements . 5
4.1 Elements of thread connection. 5
4.2 Sealing element . 5
4.3 Geometry of thread profile . 5
4.3.1 General . 5
4.3.2 Circularity of threads . 6
4.3.3 Male thread connector . 7
4.3.4 Female thread connector . 9
4.3.5 Sealing element . 10
4.3.6 Absence of geometric interference . 10
4.4 Physical and mechanical requirements of the thread connection . 11
4.4.1 Resistance of the connectors to pull forces . 11
4.4.2 Physical and mechanical requirements of the sealing element . 12
5 Testing . 12
5.1 Inspection . 12
5.2 Circularity of threads . 12
5.2.1 Circularity of male threads . 12
5.2.2 Circularity of female threads . 13
5.3 Geometry of male thread connector. 13
5.4 Geometry of female thread connector . 16
5.5 Beginning of the effective thread of the male connection . 21
5.6 Resistance of the connectors to pull forces . 21

European foreword
This document (EN 148-1:2018) has been prepared by Technical Committee CEN/TC 79 “Respiratory
protective devices”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2019, and conflicting national standards shall be
withdrawn at the latest by June 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 148-1:1999.
The following main technical changes have been made compared to EN 148-1:1999:
a) ISO 17420-3 taken as basis for the revision of EN 148-1;
b) description and additional requirements for thread connector with sockets are added;
c) sealing surface adapted and a new drawing for socket sealing included;
d) pull force in 4.4.1 reduced to 50 N;
e) Annex ZA deleted.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
1 Scope
This document specifies standard threads for respiratory protective devices and the description of test
devices necessary for the assessment of some of the requirements.
This document does not apply to diving equipment and to positive pressure demand breathing
apparatus.
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 48-4, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 4: Indentation
hardness by durometer method (Shore hardness)
ISO/DIS 815-1, Rubber, vulcanized or thermoplastic — Determination of compression set — Part 1: At
ambient or elevated temperatures
ISO/DIS 16972, Respiratory protective devices —Definitions of terms and pictograms
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/DIS 16972 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
thread connection
shape and dimensions of the standard connection between RPD components with a male thread
connector and respiratory interfaces with a female thread connector
3.1.2
socket
inner component that can rotate independently of the outer male thread connector
3.2 Symbols
For the purposes of this document, the following symbols apply (see Figure 1 to Figure 20).
d major diameter of male thread
d minor diameter of male thread
d inner dimension for gauge
d outer dimension for gauge
D major diameter of female thread
D minor diameter of female thread
h pitch
t thread height
r radius
b thickness of gauge (GO gauge or NO-GO gauge)
w permissible surface degradation due to wear and tear for d1 and d2
H thickness of ring A
a
H thickness of ring B
b
4 Requirements
4.1 Elements of thread connection
The thread connection shall consist of the following three elements.
1) A male thread connector without sockets which forms the connecting element of a filter or a male
thread connector with socket for connectors other than for filters.
2) A female thread connector which forms the connecting element of the respiratory interface.
3) A sealing element which is retained within the female thread connector.
4.2 Sealing element
The sealing element shall be retained in place, correctly centred, and it shall not be possible to dislodge
it during normal use.
It shall be easy to check that the sealing element is in place (e.g. sealing element of a different colour
from the female thread connector).
Testing shall be performed in accordance with 5.1.
4.3 Geometry of thread profile
4.3.1 General
The profile of the thread shall have a diameter of 40x1/7 as defined by the female and male threads
profile geometry (Figure 1) and thread dimensions given in Table 1.
Key
1 female thread
2 male thread
Figure 1 — Geometry of thread profile
Table 1 — Thread dimensions for the mechanical connection interface
Dimensions in millimetres
Thread Male thread Female thread
No. of
threads
Thread
Pitch per Radius
height
Major Minor Major Minor 25,4 m

diameter diameter diameter diameter m
d1 d2 D1 D2
max. min. max. min. min. max. h z t1 r
⌀ 40x1/7 40,00 39,70 38,40 40,16 38,56 38,86 3,629 7 0,65 to 0,8 1,225
Testing shall be performed in accordance with 5.1, 5.3, 5.4 and 5.5.
4.3.2 Circularity of threads
4.3.2.1 General
The circularity tolerance of the threads shall be 0,15 mm referred to the major radius of the male thread
and 0,15 mm referred to the minor radius of the female thread.
4.3.2.2 Circularity of the male thread
When approached perpendicular to the axis of the thread in any angular orientation, the limit snap
gauge with single-ended jaws shall not pass over the thread (see Figure 8).
Testing shall be performed in accordance with 5.2.1.
4.3.2.3 Circularity of the female thread
When approached parallel to the axis of the thread in any angular orientation, the sector NO-GO gauge
shall not enter the thread (see Figure 9).
Testing shall be performed in accordance with 5.2.2.
4.3.3 Male thread connector
4.3.3.1 General
The material used for the male thread connector and its thickness is left to the manufacturer's choice.
4.3.3.2 Sealing surface
The shape of the sealing surface of the male thread connector shown in Figure 2 with the enlarged
detail of Figures 2 a, 2 b, 2 c, 2 d that interfaces with the sealing element, is left to the manufacturer’s
choice. For example, it can be flat (see Figure 2 a), rounded with a radius ≥ 2 mm (see Figure 2 b), flat
with a raised sealing ring (see Figure 2 c) or socket sealing (see Figure 2 d). If there is a raised sealing
ring, it shall have a radius ≥ 0,3 mm.
Dimensions in millimetres
a) flat sealing surface b) rounded sealing c) raised sealing d) socket sealing
surface surface surface
a The outlet diameter in Figure 2 d is specified for the upper limit to allow a minimum area for the sealing. The
lower limit is not specified because it is covered indirectly by other performance requirements, such as breathing
resistance.
Figure 2 — Sealing surface of the male thread connector
4.3.3.3 Dimensions
The axial dimensions of the male thread connector shall be measured st
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