SIST EN 4550-2:2004
(Main)Aerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 2: Port ends
Aerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 2: Port ends
This standard defines the dimensions and tolerances for the port end of inch series pipe couplings, 37°, for aerospace applications.
Matched fluid system component shall have a port connection in accordance with EN 4550-3.
Luft- und Raumfahrt - Rohrverschraubung 37° - Konstruktionsblatt - Inch-Reihe - Teil 2: Einschraubenden
Diese Norm legt die Maße und Grenzabmaße von Einschraubenden für Rohrverschraubungen 37°, Inch-Reihe, für Anwendungen in der Luft- und Raumfahrt fest.
Das zugehörige Bauteil der fluidischen Anlage muss ein Einschraubloch nach EN 4550-3 aufweisen.
Aerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 2: Port ends
General Information
Overview
EN 4550-2:2003 is a European aerospace standard that specifies the dimensions and tolerances for the port end of inch-series, 37° pipe couplings used in aerospace fluid systems. The standard covers the geometric and dimensional requirements needed to ensure interchangeability and reliable mechanical sealing for mating components in aircraft hydraulic and fluid distribution systems. Dimensions and tolerances are given in millimetres and are illustrated in a figure and tabulated (Table 1).
Key topics and requirements
- Scope: Specifies port-end geometry for 37° design-configuration pipe couplings in the inch series for aerospace applications.
- Dimensions and tolerances: Detailed dimensional data and tolerance limits are provided (see Figure 1 and Table 1). Values are expressed in millimetres.
- Threading: Thread forms referenced follow UNJ / UNJF series as covered by ISO 3161 (UNJ threads – general requirements and limit dimensions).
- Concentricity requirement: All outer surfaces shall be concentric to the specified inner diameter A, with a tolerance of 0.1 mm.
- Designation: Dimensional codes correspond to nominal diameters expressed in sixteenths of an inch; examples and an identity-block format (e.g., EN4550-2 -08) are provided to identify parts.
- Interchangeability: Matched fluid system components must have port connections in accordance with EN 4550-3 to ensure compatibility between coupling port ends and mating parts.
Practical applications
EN 4550-2 is applied wherever precise, repeatable port-end dimensions are required for aerospace hydraulic and pneumatic systems:
- Design and engineering of aircraft hydraulic fittings and pipe assemblies
- Manufacturing and QC of tube couplings, adapters and port components
- Maintenance, repair and overhaul (MRO) to verify replacement parts meet original dimensional criteria
- Procurement and specification writing to ensure suppliers deliver compatible couplings
- Certification and conformity checks during component acceptance and system integration
Who will use this standard
- Aerospace fluid-system designers and mechanical engineers
- Fitting and coupling manufacturers and tooling designers
- Quality assurance and inspection personnel in aerospace supply chains
- MRO organizations and service providers working on aircraft hydraulic systems
- Procurement specialists specifying interchangeability and compliance
Related standards
- EN 4550-3 - Aerospace series - Pipe couplings, 37° - Inch series - Part 3: Port connections (mating port interface)
- ISO 3161 - UNJ threads - General requirements and limit dimensions
Keywords: EN 4550-2, pipe coupling 37°, inch series, port ends, aerospace, dimensions and tolerances, UNJ threads, hydraulic fittings, fluid systems.
Frequently Asked Questions
SIST EN 4550-2:2004 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 2: Port ends". This standard covers: This standard defines the dimensions and tolerances for the port end of inch series pipe couplings, 37°, for aerospace applications. Matched fluid system component shall have a port connection in accordance with EN 4550-3.
This standard defines the dimensions and tolerances for the port end of inch series pipe couplings, 37°, for aerospace applications. Matched fluid system component shall have a port connection in accordance with EN 4550-3.
SIST EN 4550-2:2004 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.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 2: Port endsLuft- und Raumfahrt - Rohrverschraubung 37° - Konstruktionsblatt - Inch-Reihe - Teil 2: EinschraubendenAerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 2: Port ends49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 4550-2:2003SIST EN 4550-2:2004en01-maj-2004SIST EN 4550-2:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4550-2January 2003ICS 49.080English versionAerospace series - Pipe coupling, 37° - Design configuration -Inch series - Part 2: Port endsThis European Standard was approved by CEN on 2 June 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 4550-2:2003 ESIST EN 4550-2:2004
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