Aerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 4: Female sealing ends

This standard defines the dimensions and tolerances for the female sealing end of inch series pipe couplings, 37°, for aerospace applications.
Matched fluid system component shall have a male sealing end in accordance with EN 4550-1.

Luft- und Raumfahrt - Rohrverschraubung 37° - Konstruktionsblatt - Inch-Reihe - Teil 4: Dichtgeometrie

Série aérospatiale - Système de raccordement 37° - Configuration géométrique - Série inch - Partie 4: Extrémités d´étanchéité femelles

Aeronavtika - Cevni priključek, 37° - Konstrukcijski list - Colska izvedba - 4. del: Ženski tesnilni končniki

Ta standard določa dimenzije in odstopanja za ženske tesnilne končnike colske izvedbe cevnih priključkov 37° za uporabo v aeronavtiki. Ujemajoča se tekočinska sistemska komponenta mora imeti moški tesnilni končnik v skladu s standardom EN 4550-1.

General Information

Status
Published
Publication Date
02-Feb-2015
ICS
49.080 - Aerospace fluid systems and components
Technical Committee
I13 - Imaginarni 13
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
12-Jan-2015
Due Date
19-Mar-2015
Completion Date
03-Feb-2015
Ref Project
EN 4550-4:2014 - Aerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 4: Female sealing ends

Relations

Replaces
SIST EN 4550-4:2004 - Aerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 4: Female sealing ends
Effective Date
01-Mar-2015

Overview

EN 4550-4:2014 - "Aerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 4: Female sealing ends" is a CEN standard that specifies the dimensions and tolerances for female sealing ends of 37° inch-series pipe couplings used in aerospace fluid systems. Dimensions and tolerances are given in millimetres and the document ensures interchangeability with matched male sealing ends manufactured to EN 4550-1.

Key Topics

  • Scope and purpose
    • Defines geometric configuration for the female sealing end of 37° pipe couplings (inch series) for aerospace applications.
    • Ensures compatibility with male sealing ends per EN 4550-1.
  • Dimensions and tolerances
    • Detailed dimensions illustrated in Figure 1 and tabulated in Table 1.
    • Tolerances for critical dimensions (e.g., S tolerance added: ±0.10 mm; 37° angle tolerance: ±0.5° as noted in the standard evolution).
    • All dimensions expressed in millimetres despite inch-series nominal sizes.
  • Dimensional coding and designation
    • Two-digit dimensional code corresponds to tube nominal diameter expressed as the number of 1/16‑inch increments (e.g., code -08 corresponds to a specific nominal diameter in Table 1).
    • Example designation format: EN4550-4-08 (standard number + dimensional code).
  • Normative references
    • EN 4550-1 is mandatory for mating male sealing ends; other referenced documents are applicable where cited.

Applications

EN 4550-4:2014 is intended for:

  • Aerospace component designers and hydraulic/pneumatic system engineers specifying pipe couplings and fittings.
  • OEMs, suppliers and manufacturers producing inch‑series 37° pipe couplings and ferrules to ensure interchangeability and conformity.
  • Quality assurance, inspection, and procurement teams verifying dimensional conformity of female sealing ends.
  • Maintenance and repair organizations selecting replacement parts that must match male sealing ends conforming to EN 4550-1.

Practical uses include specifying part geometry on drawings, defining inspection limits for production, and ensuring component interchangeability across suppliers in aircraft fluid systems.

Related Standards

  • EN 4550-1 - Aerospace series - Pipe coupling, 37° - Part 1: Male sealing ends (normative; mating component requirements).
  • Other parts of the EN 4550 series govern complementary design aspects of the same coupling family (refer to CEN/ASD-STAN publications for full list).

Keywords: EN 4550-4:2014, pipe coupling 37°, female sealing ends, inch series, aerospace standard, dimensions and tolerances, EN 4550-1, dimensional code, interchangeability.

Frequently Asked Questions

SIST EN 4550-4:2015 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 4: Female sealing ends". This standard covers: This standard defines the dimensions and tolerances for the female sealing end of inch series pipe couplings, 37°, for aerospace applications. Matched fluid system component shall have a male sealing end in accordance with EN 4550-1.

This standard defines the dimensions and tolerances for the female sealing end of inch series pipe couplings, 37°, for aerospace applications. Matched fluid system component shall have a male sealing end in accordance with EN 4550-1.

SIST EN 4550-4:2015 is classified under the following ICS (International Classification for Standards) categories: 49.080 - Aerospace fluid systems and components. The ICS classification helps identify the subject area and facilitates finding related standards.

SIST EN 4550-4:2015 has the following relationships with other standards: It is inter standard links to SIST EN 4550-4:2004. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

SIST EN 4550-4:2015 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Rohrverschraubung 37° - Konstruktionsblatt - Inch-Reihe - Teil 4: DichtgeometrieSérie aérospatiale - Système de raccordement 37° - Configuration géométrique - Série inch - Partie 4: Extrémités d´étanchéité femellesAerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 4: Female sealing ends49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 4550-4:2014SIST EN 4550-4:2015en,fr,de01-marec-2015SIST EN 4550-4:2015SLOVENSKI
STANDARDSIST EN 4550-4:20041DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4550-4
December 2014 ICS 49.080 Supersedes EN 4550-4:2003English Version
Aerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 4: Female sealing ends
Série aérospatiale - Système de raccordement 37° - Configuration géométrique - Série inch - Partie 4: Extrémités d´étanchéité femelles
Luft- und Raumfahrt - Rohrverschraubung 37° - Konstruktionsblatt - Inch-Reihe - Teil 4: Dichtgeometrie This European Standard was approved by CEN on 11 October 2014.
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, 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:
Avenue Marnix 17,
B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4550-4:2014 ESIST EN 4550-4:2015
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