SIST EN 3637:2023
(Main)Aerospace series - Nut, self-locking, bi-hexagonal (double reduced), in heat resisting nickel base alloy - NI-P101HT (Waspaloy), silver plated, Classification: 1 210 MPa/730 °C
Aerospace series - Nut, self-locking, bi-hexagonal (double reduced), in heat resisting nickel base alloy - NI-P101HT (Waspaloy), silver plated, Classification: 1 210 MPa/730 °C
This document specifies the dimensions of self-locking, silver-coated bi-hexagonal nuts with MJ-thread in heat resisting nickel base alloy NI-P101HT for aerospace applications.
Maximum test temperature of the material 730 °C.
Luft- und Raumfahrt - Zwölfkantmutter, selbstsichernd (Doppelt reduziert), aus hochwarmfester Nickelbasislegierung - NI-P101HT (Waspaloy), versilbert, Klasse: 1 210 MPa/730 °C
Dieses Dokument legt die Maße von selbstsichernden, versilberten Zwölfkantmuttern mit MJ-Gewinde aus hochwarmfester Nickelbasislegierung NI P101HT für Anwendungen in der Luft- und Raumfahrt fest.
Die maximale Prüftemperatur des Werkstoffes beträgt 730 °C.
Série aérospatiale - Écrou bihexagonal à freinage interne (double réduit), en alliage résistant à chaud base nickel NI-P101HT (Waspaloy), argenté - Classification : 1 210 MPa/730 °C
Le présent document spécifie les dimensions des écrous bihexagonaux, à freinage interne, argentés, à filetage MJ en alliage résistant à chaud base nickel NI-P101HT, pour les applications aérospatiales.
Température maximale d’essai du matériau : 730 °C.
Aeronavtika - Matice, samozapiralne, biheksagonalne (dvojno nižane), iz toplotnoodporne zlitine na nikljevi osnovi - NI-P101HT (Waspaloy), posrebrene - Klasifikacija: 1210 MPa/730 °C
Ta dokument določa dimenzije samozapiralnih posrebrenih dvo-šestrobih matic z navojem MJ iz toplotnoodporne zlitine na nikljevi osnovi (NI-P101HT) za uporabo v aeronavtiki.
Najvišja preskusna temperatura materiala je 730 °C.
General Information
Relations
Overview
EN 3637:2023 specifies the dimensions, materials and surface treatment for aerospace self-locking, silver‑coated bi‑hexagonal (double reduced) nuts manufactured from the heat‑resisting nickel base alloy NI‑P101HT (Waspaloy). The standard covers MJ‑thread sizes and defines configuration, tolerances and marking requirements for nuts intended for high‑temperature aerospace use. Material test temperature is up to 730 °C and classification is 1 210 MPa / 730 °C. EN 3637:2023 supersedes EN 3637:2008.
Key topics and technical requirements
- Configuration and dimensions: Bi‑hexagonal wrenching configuration per Figure 1 and Table 1; dimensions are specified after silver coating. Thread forms and limits reference ISO MJ thread standards.
- Threads: MJ thread form and limits in conformity with ISO 5855‑1 and ISO 5855‑2; tolerances in the self‑locking zone apply before deformation.
- Wrenching: Bi‑hexagonal wrenching configuration per ISO 4095.
- Material: Nickel base alloy NI‑P101HT (Waspaloy) in accordance with EN 2959 or EN 3220 (cold worked/softened bar and wire for fasteners).
- Surface treatment: Electrolytic silver plating per EN 2786 with thickness 5 µm to 15 µm. For MJ6 and larger the pitch‑diameter coating shall be at least 5 µm; MJ5 nuts must have complete thread coverage.
- Finish and details: Removal of sharp edges (0.1 mm to 0.4 mm); certain form details left to manufacturer’s option.
- Designation and marking: Marking per EN 2424, Class A; designation examples and optional design codes included.
- Quality and technical specification: Technical specification follows EN 3005, with supplier approval and qualification requirements aligned to aerospace quality systems (e.g., EN 9100) and product qualification procedures (e.g., EN 9133) where applicable.
Applications and users
EN 3637:2023 is intended for aerospace designers, fastener manufacturers, procurement and quality assurance teams, and maintenance/repair organisations that require standardized, high‑temperature fastening components. Typical uses include aerospace assemblies subjected to elevated temperatures where a combination of self‑locking behavior, high strength, and corrosion/oxidation resistance provided by Waspaloy and silver coating are required.
Who will use it:
- Aerospace fastener manufacturers producing NI‑P101HT nuts
- Aircraft/engine design engineers specifying high‑temperature fasteners
- Quality managers and procurement teams verifying compliance
- Certification and maintenance organisations validating part conformity
Related standards
- EN 2786 - Electrolytic silver plating of fasteners
- EN 2959 / EN 3220 - NI‑PH / NI‑P101HT material specifications
- EN 3005 - Nuts MJ threads technical specification
- EN 2424 - Marking of aerospace products
- ISO 5855‑1 / ISO 5855‑2 - MJ threads
- ISO 4095 - Bihexagonal drives
- EN 9100, EN 9133 - Aerospace quality and qualification procedures
Keywords: EN 3637:2023, aerospace nuts, self‑locking bi‑hexagonal nut, NI‑P101HT, Waspaloy, silver plated, MJ thread, high‑temperature fasteners, aerospace standard.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2023
Nadomešča:
SIST EN 3637:2008
Aeronavtika - Matice, samozapiralne, biheksagonalne (dvojno nižane), iz
toplotnoodporne zlitine na nikljevi osnovi - NI-P101HT (Waspaloy), posrebrene -
Klasifikacija: 1210 MPa/730 °C
Aerospace series - Nut, self-locking, bi-hexagonal (double reduced), in heat resisting
nickel base alloy - NI-P101HT (Waspaloy), silver plated, Classification: 1 210 MPa/730
°C
Luft- und Raumfahrt - Zwölfkantmutter, selbstsichernd (Doppelt reduziert), aus
hochwarmfester Nickelbasislegierung - NI-P101HT (Waspaloy), versilbert, Klasse: 1 210
MPa/730 °C
Série aérospatiale - Écrou bihexagonal à freinage interne (double réduit), en alliage
résistant à chaud base nickel NI-P101HT (Waspaloy), argenté - Classification : 1 210
MPa/730 °C
Ta slovenski standard je istoveten z: EN 3637:2023
ICS:
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 3637
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2023
EUROPÄISCHE NORM
ICS 49.030.30 Supersedes EN 3637:2008
English Version
Aerospace series - Nut, self-locking, bi-hexagonal (double
reduced), in heat resisting nickel base alloy - NI-P101HT
(Waspaloy), silver plated, Classification: 1 210 MPa/730 °C
Série aérospatiale - Écrou bihexagonal, à freinage Luft- und Raumfahrt - Zwölfkantmutter, selbstsichernd
interne (double réduit), en alliage résistant à chaud (Doppelt reduziert), aus hochwarmfester
base nickel NI-P101HT (Waspaloy), argenté - Nickelbasislegierung - NI-P101HT (Waspaloy),
Classification : 1 210 MPa/730 °C versilbert, Klasse: 1 210 MPa/730 °C
This European Standard was approved by CEN on 12 June 2023.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3637:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Requirements . 4
4.1 Configuration – dimensions – tolerances . 4
4.2 Material . 4
4.3 Surface treatment . 5
5 Designation . 6
6 Marking . 6
7 Technical specification . 7
Bibliography . 8
European foreword
This document (EN 3637:2023) has been prepared by the Aerospace and Defence Industries Association
of Europe — Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by January 2024, and conflicting national standards shall
be withdrawn at the latest by January 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN 3637:2008.
...
Frequently Asked Questions
SIST EN 3637:2023 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Nut, self-locking, bi-hexagonal (double reduced), in heat resisting nickel base alloy - NI-P101HT (Waspaloy), silver plated, Classification: 1 210 MPa/730 °C". This standard covers: This document specifies the dimensions of self-locking, silver-coated bi-hexagonal nuts with MJ-thread in heat resisting nickel base alloy NI-P101HT for aerospace applications. Maximum test temperature of the material 730 °C.
This document specifies the dimensions of self-locking, silver-coated bi-hexagonal nuts with MJ-thread in heat resisting nickel base alloy NI-P101HT for aerospace applications. Maximum test temperature of the material 730 °C.
SIST EN 3637:2023 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.
SIST EN 3637:2023 has the following relationships with other standards: It is inter standard links to SIST EN 3637:2008, SIST EN 3637:2008, SIST EN 3637:2008. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase SIST EN 3637:2023 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
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