prEN 3049

Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set - Hardness 80 IRHD

This document specifies the characteristics of O-rings in fluorocarbon rubber (FKM), low compression set, hardness 80 IRHD, for aerospace applications.
They are intended to be used in air, mineral / synthetic oil and fuel systems.
Operating conditions - Temperature:
a)   Continuous operation: −20 °C to +225 °C;
b)   Static applications minimum temperature of use: −50 °C.
Limitation: not to be used with phosphoric ester type hydraulic fluids (permanent or temporary immersion).

Luft- und Raumfahrt - O-Ringe aus Fluorcarbon-Elastomer (FKM) mit niedrigem Druckverformungsrest - Härte 80 IRHD

Série aérospatiale - Joints toriques, en élastomère fluorocarbone (FKM), à faible déformation rémanente après compression - Dureté 80 DIDC

Le présent document spécifie les caractéristiques des joints toriques en élastomère fluorocarbone (FKM), à faible déformation rémanente après compression, de dureté 80 DIDC, pour les applications aérospatiales.
Ils sont destinés à être utilisés dans les circuits d'air, d'huile minérale/synthétique et de carburants.
Conditions de fonctionnement - Température :
a)   service continu : −20 °C à +225 °C ;
b)   température minimale d'utilisation pour les applications statiques : −50 °C.
Limitation :
à ne pas utiliser avec des fluides hydrauliques de type ester phosphorique (immersion permanente ou temporaire).

Aeronavtika - Tesnilke O, iz fluoroogljikove gume (FKM), nizka stopnja kompresije - Trdota 50 IRHD

General Information

• Status: Not Published
• Publication Date: 07-Dec-2025
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3/S 3 - Hydraulics
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 05-Sep-2024
• Completion Date: 05-Sep-2024
• Ref Project: oSIST prEN 3049:2024 - Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set - Hardness 80 IRHD

Relations

• Revises: EN 3049:1998 - Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set - Hardness 80 IRHD
• Effective Date: 08-Apr-2024

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2024
Aeronavtika - Tesnilke O, iz fluoroogljikove gume (FKM), nizka stopnja kompresije
- Trdota 50 IRHD
Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set -
Hardness 80 IRHD
Luft- und Raumfahrt - O-Ringe aus Fluorcarbon-Elastomer (FKM) mit niedrigem
Druckverformungsrest - Härte 80 IRHD
Série aérospatiale - Joints toriques, en élastomère fluorocarbone (FKM), à faible
déformation rémanente après compression - Dureté 80 DIDC
Ta slovenski standard je istoveten z: prEN 3049
ICS:
49.080 Letalski in vesoljski Aerospace fluid systems and
hidravlični sistemi in deli components
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2024
ICS 49.080 Will supersede EN 3049:1998
English Version
Aerospace series - O-rings, in fluorocarbon rubber (FKM),
low compression set - Hardness 80 IRHD
Série aérospatiale - Joints toriques, en élastomère Luft- und Raumfahrt - O-Ringe aus Fluorcarbon-
fluorocarbone (FKM), à faible déformation rémanente Elastomer (FKM) mit niedrigem Druckverformungsrest
après compression - Dureté 80 DIDC - Härte 80 IRHD
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
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 supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3049:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Required characteristics . 5
4.1 Configuration — Dimensions — Tolerances — Masses . 5
4.2 Material . 11
5 Storage . 11
6 Designation . 11
7 Marking / Packaging . 11
8 Technical specification . 11
Bibliography . 12

European foreword
This document (prEN 3049:2024) has been prepared by the Aerospace and Defence Industries
Association of Europe — Standardization (ASD-STAN).
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 3049:1998.
The main changes compared to the previous edition are as follows:
— Normative references were updated;
— Deletion of Figure 2 to Figure 5 due to redundancy;
— Clause 7, Marking/Packaging, was updated;
Introduction
The dimensions are selected from ISO 3601-1:2012, Table 7, Table 8, Table 9, Table 10 and Table 11.
1 Scope
This document specifies the characteristics of O-rings in fluorocarbon rubber (FKM), low compression
set, hardness 80 IRHD, for aerospace applications.
They are intended to be used in air, mineral / synthetic oil and fuel systems.
Operating conditions - Temperature:
a) Continuous operation: −20 °C to +225 °C;
b) Static applications minimum temperature of use: −50 °C.
Limitation: not to be used with phosphoric ester type hydraulic fluids (permanent or temporary
immersion).
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.
EN 2798, Aerospace series - Fluorocarbon rubber (FKM) - Low compressions set - Hardness 80 IRHD
EN 3050, Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set - Technical
specification
ISO 27996, Aerospace fluid systems — Elastomer seals — Storage and shelf life
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
4 Required characteristics
4.1 Configuration — Dimensions — Tolerances — Masses
For Configuration, Dimensions, Tolerances and Masses see Figure 1, Table 1, Table 2, Table 3, Table 4
and Table 5.
Dimensions and tolerances are in millimetres.
Key
d inside diameter [mm];
d section diameter [mm].
Figure 1 — Typical O-ring configuration
Table 1 — Code, inside diameter d , inside diameter tolerances, mass — section diameter, d of
1 2
1,8 ± 0,08 — Code A
d d d
1 1 1
a a a
Code Mass Code Mass Code Mass
nom. Tol. ± nom. Tol. ± nom. Tol. ±
0018 1,8 0,05 0100 10,0 0,15 0,17 0365 36,5 0,31 0,57
0020 2,0 0106 10,6 0,18 0375 37,5 0,58
0,16 0,32
0,06
0022 2,24 0112 11,2 0,19 0387 38,7 0,60
0025 2,5 0118 11,8 0,20 0400 40,0 0,33 0,62
0028 2,8 0125 12,5 0,21 0412 41,2 0,34 0,64
0,17
0,07
0031 3,15 0132 13,2 0,22 0425 42,5 0,65
0,35
0035 3,55 0140 14,0 0,23 0437 43,7 0,67
0,08 0,18
0037 3,75 0150 15,0 0,25 0450 45,0 0,36 0,69
0040 4,0 0160 16,0 0,19 0,26 0475 47,5 0,38 0,73
0,09
0,13
0045 4,5 0170 17,0 0,28 0500 50,0 0,39 0,77
0,20
0048 4,87 0180 18,0 0,29 0530 53,0 0,41 0,81
0050 5,0 0190 19,0 0,31 0560 56,0 0,42 0,85
0,10 0,21
0051 5,15 0200 20,0 0,32 0600 60,0 0,45 0,91
0053 5,3 0212 21,2 0,22 0,34 0630 63,0 0,46 0,96
0056 5,6 0,11 0224 22,4 0,23 0,36 0670 67,0 0,49 1,02
0060 6,0 0236 23,6 0,38 0710 71,0 0,51 1,08
0,12 0,24
0063 6,3 0250 25,0 0,40 0750 75,0 0,53
...