EN 4591:2005
(Main)Aerospace series - Nuts, barrel, self-locking, floating, self-aligning, in heat resisting nickel base alloy, MoS2 lubricated - Classification: 1 550 MPa (at ambient temperature) / 315 °C
Aerospace series - Nuts, barrel, self-locking, floating, self-aligning, in heat resisting nickel base alloy, MoS2 lubricated - Classification: 1 550 MPa (at ambient temperature) / 315 °C
This standard specifies the characteristics of self-locking, floating, self-aligning barrel nuts, in heat resisting nickel alloy, MoS2 lubricated.
Classification: 1 550 MPa / 315 °C
Luft- und Raumfahrt - Selbsteinstellende, freibewegliche, selbstsichernde Tonnenmuttern, aus hochwarmfester Nickelbasislegierung, MoS2-geschmiert - Klasse: 1 550 Mpa (bei Raumtemperatur) / 315 °C
Diese Norm legt die Merkmale von selbstsichernden, beweglichen, selbsteinstellenden Tonnenmuttern aus hochwarmfester Nickellegierung, MoS2-geschmiert, fest.
Klasse: 1 550 MPa )/315 °C )
Série aérospatiale - Écrous à portée cylindrique, à freinage interne, flottants, orientables, en alliage résistant à chaud à base de nickel, lubrifiés MoS2 - Classification : 1 550 MPa (à température ambiante) / 315 °C
Aeronavtika – Matice, sodčkaste, samonaravnalne, prosto gibljive, samovarovalne, zlitine, odporne proti toploti, na nikljevi osnovi, namazane z MoS2 – Klasifikacija: 1 550 MPa (pri temperaturi okolice) / 315 °C
General Information
- Status
- Published
- Publication Date
- 06-Dec-2005
- Withdrawal Date
- 29-Jun-2006
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3 - Mechanical
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 07-Dec-2005
- Completion Date
- 07-Dec-2005
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 4591:2005 specifies requirements for aerospace-grade barrel nuts that are self-locking, floating and self-aligning, manufactured from a heat-resisting nickel‑base alloy and MoS2 (molybdenum disulphide) lubricated. The standard gives dimensional, material, surface treatment, marking and quality requirements for these specialty nuts with the Classification 1 550 MPa (ambient) / 315 °C. EN 4591:2005 is intended for use across the aerospace industry where high strength and elevated temperature performance are required.
Key topics and requirements
- Component type: Self-locking, floating, self-aligning barrel nuts (MJ threads referenced).
- Material: Heat-resisting nickel base alloy specified via EN 3666 (NI‑PH2601 reference for forged fasteners).
- Lubrication: MoS2 dry lubrication in accordance with EN 2491 (coating methods); threads must be treated.
- Mechanical classification: Minimum tensile capability 1 550 MPa at ambient (tested with higher-strength bolts); maximum exposure temperature 315 °C without permanent change (temperature limit depends on surface treatment).
- Dimensions & tolerances: See ISO 12278 for dimensions (except temperature class) and ISO 5855‑2 / ISO 8788 for thread limits and form/position tolerances.
- Surface finish & thread treatment: Surface treatment mandatory on threads; other surfaces optional.
- Marking & designation: Marking follows EN 2424 (style N); designation example format EN4591-060 (diameter code).
- Quality & approval: Manufacturer and product qualification references include EN 9100 (quality management) and EN 9133 (qualification procedures); procurement guidance in ISO 5858.
Applications and users
- Typical users: aerospace design engineers, fastener manufacturers, procurement/specification teams, quality/inspection engineers, and certification bodies.
- Practical applications: specifying and procuring aerospace fasteners where a self-locking, floating and self-aligning barrel nut is required for high-strength joints and where operation may involve elevated temperatures. EN 4591 is used to ensure consistent performance, interchangeability and traceability of critical nuts in aerospace structures and assemblies.
Related standards
- ISO 12278 - barrel nut dimensions (MJ thread)
- ISO 5855‑2 / ISO 5858 - thread limits and procurement specs
- ISO 8788 - form and position tolerances for nuts
- EN 2491 - MoS2 dry lubricants (coating methods)
- EN 3666 - heat resisting alloy specification
- EN 2424 - marking of aerospace products
- EN 9100 / EN 9133 - quality system and qualification for aerospace standard parts
EN 4591:2005 is a focused aerospace fastener standard for self-locking, MoS2‑lubricated nickel alloy barrel nuts with defined mechanical classification (1 550 MPa / 315 °C), intended to support safe, repeatable specification and procurement in high‑performance aerospace applications.
Get Certified
Connect with accredited certification bodies for this standard
National Aerospace and Defense Contractors Accreditation Program (NADCAP)
Global cooperative program for special process quality in aerospace.
NSF-ISR
NSF International Strategic Registrations.
Orion Registrar Inc.
US-based certification body for management systems.
Sponsored listings
Frequently Asked Questions
EN 4591:2005 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Nuts, barrel, self-locking, floating, self-aligning, in heat resisting nickel base alloy, MoS2 lubricated - Classification: 1 550 MPa (at ambient temperature) / 315 °C". This standard covers: This standard specifies the characteristics of self-locking, floating, self-aligning barrel nuts, in heat resisting nickel alloy, MoS2 lubricated. Classification: 1 550 MPa / 315 °C
This standard specifies the characteristics of self-locking, floating, self-aligning barrel nuts, in heat resisting nickel alloy, MoS2 lubricated. Classification: 1 550 MPa / 315 °C
EN 4591:2005 is classified under the following ICS (International Classification for Standards) categories: 49.030.30 - Nuts. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 4591:2005 has the following relationships with other standards: It is inter standard links to EN 818-7:2002+A1:2008, EN 2424:2008, EN 9133:2018, EN 9100:2018, EN ISO 15792-1:2008, EN 840-6:2004+A1:2008, EN 2491:2011, EN 4590:2005. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 4591:2005 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.Aerospace series - Nuts, barrel, self-locking, floating, self-aligning, in heat resisting nickel base alloy, MoS2 lubricated - Classification: 1 550 MPa (at ambient temperature) / 315 °CSérie aérospatiale - Écrous a portée cylindrique, a freinage interne, flottants, orientables, en alliage résistant a chaud a base de nickel, lubrifiés MoS2 - Classification : 1 550 MPa (a température ambiante) / 315 °CLuft- und Raumfahrt - Selbsteinstellende, freibewegliche, selbstsichernde Tonnenmuttern, aus hochwarmfester Nickelbasislegierung, MoS2-geschmiert - Klasse: 1 550 Mpa (bei Raumtemperatur) / 315 °CTa slovenski standard je istoveten z:EN 4591:2005SIST EN 4591:2006en49.030.30ICS:SLOVENSKI
STANDARDSIST EN 4591:200601-september-2006
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4591
December 2005 ICS 49.030.30 English Version
Aerospace series - Nuts, barrel, self-locking, floating, self-aligning, in heat resisting nickel base alloy, MoS2 lubricated - Classification: 1 550 MPa (at ambient temperature) / 315 °C
Série aérospatiale - Écrous à portée cylindrique, à freinage interne, flottants, orientables, en alliage résistant à chaud à base de nickel, lubrifiés MoS2 - Classification : 1 550 MPa (à température ambiante) / 315 °C
Luft- und Raumfahrt - Selbsteinstellende, freibewegliche, selbstsichernde Tonnenmuttern, aus hochwarmfester Nickelbasislegierung, MoS2-geschmiert - Klasse: 1 550 Mpa (bei Raumtemperatur) / 315 °C This European Standard was approved by CEN on 26 October 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36
B-1050 Brussels © 2005 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4591:2005: E
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...