Aerospace series - Nipples, lubricating, axial type, in corrosion resisting steel, passivated

This European Standard specifies the required characteristics and the tests for lubricating nipples of the axial type, in corrosion resisting steel, passivated. Annex A (normative) states the clearance space requirements for the coupling and uncoupling of the lubricating gun and the maximum permissible diameter of the lubricating gun barrel, together with installation thread requirements.
Lubricating nipples according to this standard are intended for use in aerospace assemblies, where regular lubrication of moving parts is required.

Luft- und Raumfahrt - Kegel-Schmiernippel, aus korrosionsbeständigem Stahl, passiviert

Série aérospatiale - Graisseurs à accrochage axial, en acier résistant à la corrosion, passivés

La présente norme européenne spécifie les caractéristiques requises et les essais pour les graisseurs à accrochage axial, en acier résistant à la corrosion, passivés. L’Annexe A (normative) définit les besoins en espace de dégagement pour l’accouplement et le désaccouplement du pistolet de graissage, le diamètre maximal admissible du fût du pistolet de graissage, ainsi que les exigences relatives aux conditions d'installation du filetage.
Les graisseurs conformes à la présente norme sont destinés à être utilisés dans les assemblages aérospatiaux, où un graissage fréquent des parties mobiles est nécessaire.

Aeronavtika - Stožčaste mazalke, aksialne, iz korozijsko odpornega jekla, pasivirane

Ta evropski standard določa zahtevane lastnosti in preskuse za aksialne pasivirane mazalke iz korozijsko odpornega jekla. V dodatku A (normativni) so navedene zahteve za razpoložljivi prostor za priklapljanje in odklapljanje mazalne pištole in največji dovoljeni premer tulca mazalne pištole ter zahteve za namestitveni navoj.
Mazalke iz tega evropskega standarda so namenjene za uporabo v aeronavtičnih sestavih, kjer je potrebno redno mazanje gibljivih delov.

General Information

Status
Published
Public Enquiry End Date
09-Feb-2016
Publication Date
05-Feb-2017
ICS
49.035 - Components for aerospace construction
Technical Committee
I13 - Imaginarni 13
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
03-Feb-2017
Due Date
10-Apr-2017
Completion Date
06-Feb-2017
Ref Project
EN 3908:2017 - Aerospace series - Nipples, lubricating, axial type, in corrosion resisting steel, passivated

Overview

SIST EN 3908:2017 is a European Standard developed by the Aerospace and Defence Industries Association of Europe (ASD-STAN) and adopted by CEN, specifying the technical requirements for axial type lubricating nipples made from corrosion-resisting, passivated steel. These nipples are critical components used in aerospace assemblies to provide reliable and regular lubrication of moving parts, ensuring optimal functioning and longevity of aerospace equipment. The standard defines essential characteristics, including materials, design, dimensions, surface treatment, marking, and test methods.

Key Topics

  • Material Specifications
    Nipples must be made from austenitic chromium-nickel corrosion-resistant steel with a minimum ultimate strength of 550 MPa. The nipple head requires case hardening to a specific depth to achieve a hardness of at least HV 533 (52 HRC).

  • Design and Dimensions
    The standard prescribes envelope dimensions for nipple heads aligned with ISO 413, while allowing some design flexibility on the nipple tip, provided key performance requirements and dimensional limits are met. Thread specifications must follow ISO 68 and ISO 965-2 for the installation thread with M6×1-6H parallel thread requirements.

  • Surface Treatment
    Nipples must undergo passivation according to EN 2516 to enhance corrosion resistance, ensuring durability in aggressive aerospace environments.

  • Marking and Identification
    Standardized marking ensures traceability and compliance per EN 2424. Each nipple must be clearly marked following style F for the product and style G for packaging.

  • Testing and Quality Assurance
    Compliance is assured through rigorous acceptance tests including dimensional inspection, hardness testing (Vickers method per ISO 6507-1), thread engagement and strength tests, burr absence inspection, and valve performance checks using a lubricant compliant with NATO STANAG 1135 specifications. Sampling procedures follow ISO 2859-1 guidelines.

  • Installation Requirements (Annex A)
    Defines spatial clearances for safe coupling and uncoupling of the lubricating gun, requiring sufficient clearance to allow a 25° tilt of the gun in any radial direction. Installation threads must also meet strict dimensional criteria to guarantee compatibility.

Applications

  • Aerospace Assemblies
    SIST EN 3908:2017 lubricating nipples are designed for precise and reliable lubrication in aerospace applications, including aircraft engines, landing gear, control systems, and other moving mechanical parts where maintenance accessibility and corrosion resistance are paramount.

  • Aviation Maintenance and Repair
    The standard ensures compatibility with specialized lubricating guns and tools in aerospace maintenance, promoting swift servicing and reducing downtime in critical equipment.

  • Defense and Space Industries
    Due to the requirement for high-performance corrosion resistance and reliability under extreme conditions, these nipples are also applicable in defense and space hardware requiring stringent quality assurance.

Related Standards

  • EN 2516 – Passivation of corrosion resisting steels, complementary surface treatment guidelines for aerospace components.
  • EN 2424 – Marking of aerospace products, standardizing traceability and identification.
  • ISO 413 – Specifies dimensions and form of lubricating nipple heads.
  • ISO 68 & ISO 965-2 – Define general purpose screw threads and tolerances, critical for ensuring thread compatibility of nipples and installation holes.
  • ISO 2859-1 – Sampling procedures for inspection by attributes, guiding quality assurance testing.
  • ISO 6507-1 – Vickers hardness testing methods used for verification of material hardness.
  • EN 9100 – Quality Management Systems for aviation, space, and defense organizations, ensuring systematic control in manufacturing.
  • STANAG 1135 – NATO standard for fuels and lubricants, referenced for lubricant compatibility tests.

SIST EN 3908:2017 provides aerospace manufacturers and maintenance personnel with a comprehensive framework to ensure the performance, compatibility, and durability of axial type lubricating nipples used in demanding aerospace environments. This standard supports safety, reliability, and efficient maintenance operations across the aviation and space industries.

Frequently Asked Questions

SIST EN 3908:2017 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Nipples, lubricating, axial type, in corrosion resisting steel, passivated". This standard covers: This European Standard specifies the required characteristics and the tests for lubricating nipples of the axial type, in corrosion resisting steel, passivated. Annex A (normative) states the clearance space requirements for the coupling and uncoupling of the lubricating gun and the maximum permissible diameter of the lubricating gun barrel, together with installation thread requirements. Lubricating nipples according to this standard are intended for use in aerospace assemblies, where regular lubrication of moving parts is required.

This European Standard specifies the required characteristics and the tests for lubricating nipples of the axial type, in corrosion resisting steel, passivated. Annex A (normative) states the clearance space requirements for the coupling and uncoupling of the lubricating gun and the maximum permissible diameter of the lubricating gun barrel, together with installation thread requirements. Lubricating nipples according to this standard are intended for use in aerospace assemblies, where regular lubrication of moving parts is required.

SIST EN 3908:2017 is classified under the following ICS (International Classification for Standards) categories: 49.035 - Components for aerospace construction. The ICS classification helps identify the subject area and facilitates finding related standards.

SIST EN 3908:2017 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.SDVLYLUDQHLuft- und Raumfahrt - Kegel-Schmiernippel, aus korrosionsbeständigem Stahl, passiviertSérie aérospatiale - Graisseurs à accrochage axial, en acier résistant à la corrosion, passivésAerospace series - Nipples, lubricating, axial type, in corrosion resisting steel, passivated49.035Sestavni deli za letalsko in vesoljsko gradnjoComponents for aerospace constructionICS:Ta slovenski standard je istoveten z:EN 3908:2017SIST EN 3908:2017en,fr,de01-april-2017SIST EN 3908:2017SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3908
January
t r s y ICS
v {ä r u w English Version
Aerospace series æ Nipplesá lubricatingá axial typeá in corrosion resisting steelá passivated Série aérospatiale æ Graisseurs à accrochage axialá en acier résistant à la corrosioná passivés
Luftæ und Raumfahrt æ KegelæSchmiernippelá aus korrosionsbeständigem Stahlá passiviert This European Standard was approved by CEN on
s s March
t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
u { r zã t r s y ESIST EN 3908:2017

Page European foreword . 3 1 Scope . 4 2 Normative references . 4 3 Required characteristics . 5 4 Designation. 7 5 Marking . 8 6 Technical specification . 8 7 Requirements and test methods . 8 Annex A (normative)
Installation requirements . 12 A.1 Space requirements . 12 A.2 Installation thread requirement . 12
EN 2424, Aerospace series — Marking of aerospace products EN 2516, Aerospace series — Passivation of corrosion resisting steels and decontamination of nickel base alloys EN 9100,
Quality Management Systems — Requirements for Aviation, Space and Defense Organizations ISO 68 (all parts), ISO general purpose screw threads — Basic profile IS0 413, Aircraft — Heads of lubricating nipples ISO 965-2, ISO general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for general purpose external and internal screw threads — Medium quality ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection ISO 6507-1,
...

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