SIST EN 4550-3:2004
(Main)Aerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 3: Port connections
Aerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 3: Port connections
This standard defines the dimensions and tolerances for the port connection of inch series pipe couplings, 37°, for aerospace applications.
Matched fluid system component shall have a port end in accordance with EN 4550-2.
Luft- und Raumfahrt - Rohrverschraubung 37° - Konstruktionsblatt - Inch-Reihe - Teil 3: Einschraublöcher
Diese Norm legt die Maße und Grenzabmaße von Einschraublöchern für Rohrverschraubungen 37°, Inch-Reihe, für Anwendungen in der Luft- und Raumfahrt fest.
Das zugehörige Bauteil der fluidischen Anlage muss ein Einschraubende nach EN 4550-2 aufweisen.
Aerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 3: Port connections
General Information
Overview
SIST EN 4550-3:2004 is a European standard developed by the European Association of Aerospace Manufacturers (AECMA-STAN) and adopted by CEN, focusing on aerospace pipe coupling port connections. This standard specifies the design configuration, dimensions, and tolerances of port connections for 37° pipe couplings within the inch series, primarily for aerospace fluid systems.
The standard ensures compatibility and interchangeability by defining precise requirements for port ends that must be matched with fluid system components conforming to EN 4550-2. These specifications promote reliability, safety, and standardization across aerospace hydraulic and fuel systems.
Key Topics
- Scope: Defines dimensional and tolerance requirements for 37° pipe coupling port connections (inch series) used in aerospace applications.
- Design configurations: Covers both low and high-depth ports to accommodate different coupling designs, identified by specific dimensions such as depth (H min.), pitch diameter, thread, and other critical parameters.
- Nominal diameters: Dimension codes represent nominal diameters in sixteenths of an inch, with corresponding UNJ and UNJF thread specifications based on ISO 3161.
- Important dimensions: Includes critical measurements like pitch diameter, thread size, port depth, and tolerances in millimeters.
- Normative references: Relies on ISO 3161 for aerospace UNJ threads and EN 4550-2 for port end definitions.
- Designation system: Standardized identity block format (e.g., EN4550-3 -08) for clear product identification in aerospace supply chains.
Applications
The SIST EN 4550-3:2004 standard is crucial for:
- Aerospace hydraulic and fuel systems: Ensuring pipe couplings maintain integrity under high-pressure conditions typical in aviation environments.
- Component manufacturing: Guiding manufacturers in producing port connections that meet aerospace industry demands for tight dimensional control and interchangeability.
- Maintenance and repair: Providing standardized ports that facilitate replacement or repair of fluid system components without custom modifications.
- Aircraft assembly: Supporting accurate fit-ups in fluid system installations, contributing to overall aircraft safety and performance.
By enforcing strict tolerance and dimension controls, it reduces the risk of leaks, mechanical failure, or mismatched components in aerodynamic and critical aircraft systems.
Related Standards
- EN 4550-2: Governs the corresponding port ends for the pipe couplings specified in EN 4550-3, ensuring matched interface geometry.
- ISO 3161: Defines aerospace UNJ thread profiles and dimensions, referenced directly for thread parameters in this standard.
- AECMA Aerospace Series: EN 4550-3 forms part of a wider Aerospace Series aimed at unifying fluid system components design.
Understanding these related standards is essential for engineers and manufacturers who require comprehensive compliance with aerospace fluid system requirements.
Keywords: EN 4550-3, aerospace pipe coupling, 37° pipe coupling, inch series, port connections, aerospace hydraulic systems, aerospace fluid system components, aerospace standards, aerospace fittings, UNJ threads, pipe coupling tolerances, CEN aerospace standards
Frequently Asked Questions
SIST EN 4550-3:2004 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 3: Port connections". This standard covers: This standard defines the dimensions and tolerances for the port connection of inch series pipe couplings, 37°, for aerospace applications. Matched fluid system component shall have a port end in accordance with EN 4550-2.
This standard defines the dimensions and tolerances for the port connection of inch series pipe couplings, 37°, for aerospace applications. Matched fluid system component shall have a port end in accordance with EN 4550-2.
SIST EN 4550-3:2004 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 3: Port connectionsLuft- und Raumfahrt - Rohrverschraubung 37° - Konstruktionsblatt - Inch-Reihe - Teil 3: EinschraublöcherAerospace series - Pipe coupling, 37° - Design configuration - Inch series - Part 3: Port connections49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 4550-3:2003SIST EN 4550-3:2004en01-maj-2004SIST EN 4550-3:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4550-3January 2003ICS 49.080English versionAerospace series - Pipe coupling, 37° - Design configuration -Inch series - Part 3: Port connectionsThis 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 4550-3:2003 ESIST EN 4550-3:2004
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