Aerospace series - Nuts, anchor, self-locking, fixed, 90° corner, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1100 MPa (at ambient temperature)/315 °C

This standard specifies the characteristics of 90° corner, reduced series, counterbored fixed anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round, in heat resisting steel, MoS2 lubricated.
Classification: 1 100 MPa / 315 °C.

Luft- und Raumfahrt - Annietmuttern, selbstsichernd, einseitiger verkürzter 90° Eckflansch, mit zylindrischer Aussenkung, aus hochwarmfestem Stahl, MoS2-geschmiert - Klasse: 1100 MPa (bei Raumtemperatur)/315 °C

Diese Norm legt die Merkmale von nicht beweglichen Annietmuttern mit zylindrischer Aussenkung und einseitigem verkürztem 90° Eckflansch, selbstsichernd durch ovale Formgebung des oberen Teils, aus hochwarmfestem Stahl, MoS2-geschmiert, fest.
Klasse: 1 100 MPa  ) / 315 °C  )

Série aérospatiale - Écrous à river, à freinage interne, fixes, d'angle 90°, série réduite, avec chambrage, en acier résistant à chaud, lubrifiés MoS2 - Classification: 1100 MPa (à température ambiante)/315 °C

Aeronavtika - Zakovne matice, samovarovalne, fiksne, rob 90°, skrajšana serija, z izvrtino za vijake, iz toplotnoodpornega jekla, mazane z MoS2 - Klasifikacija: 1100 MPa (pri temperaturi okolice)/315 °C

Ta standard določa značilnosti dvostranskih premične zakovnih matic z robom 90° skrajšane serije z izvrtino za vijake in s samozapiralno funkcijo, ki je dosežena tako, da je zgornji del oblikovan rahlo ovalno, iz toplotnoodpornega jekla in mazane z MoS2. Klasifikacija: 1.100 Mpa1 / 315 °C2.

General Information

Status
Published
Publication Date
01-Feb-2010
ICS
49.030.30 - Nuts
Technical Committee
I13 - Imaginarni 13
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Feb-2010
Due Date
08-Apr-2010
Completion Date
02-Feb-2010
Ref Project
EN 3750:2010 - Aerospace series - Nuts, anchor, self-locking, fixed, 90° corner, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C

Relations

Revised
kSIST FprEN 3750:2025 - Aerospace series - Nut, anchor, self-locking, fixed, 90° corner, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C
Effective Date
06-Dec-2023

Overview

EN 3750:2010 is a CEN aerospace standard that specifies the characteristics, designation and marking for 90° corner, reduced-series, counterbored fixed anchor nuts with a built-in self‑locking feature. These anchor nuts are made from heat-resisting steel and are MoS2 (molybdenum disulphide) lubricated. The standard classifies these parts as 1100 MPa / 315 °C, indicating the load-capacity relationship with associated bolts and the maximum temperature the nut can withstand without permanent alteration.

Key Topics

  • Configuration and dimensions: Dimensions and tolerances are defined in accordance with ISO 9156; tabled diameter codes (for example EN3750–060) are used for designation.
  • Self‑locking method: Locking is achieved by forming the upper portion of the nut out‑of‑round; tooling marks in this area are permitted per the standard.
  • Materials: Acceptable heat-resisting steels are referenced via EN 2398, EN 2399, EN 3638, EN 3639 or TR 3791.
  • Surface treatment & lubrication: Surface treatment conforms to EN 2491 and the dry lubricant specified is MoS2 (see EN 2491 and EN 2491/EN 2491-related methods). Dimensions/tolerances apply before MoS2 lubrication.
  • Marking and designation: Marking follows EN 2424 (style N). The designation format uses the standard number and a diameter code (example: NUT / EN3750–060).
  • Quality and approval: Manufacturer approval and product qualification follow EN 9100 and EN 9133 respectively.

Applications

These anchor nuts are intended for aerospace and defence applications where reliable, vibration‑resistant fastening and elevated temperature performance are required. Typical practical uses include:

  • Structural joints in airframes where a 90° corner anchor is needed
  • High‑temperature assemblies where components may be exposed up to 315 °C after treatment
  • Retrofit or repair situations requiring fixed anchor fastenings with self‑locking capability

Key benefits for engineers and procurement specialists:

  • Reliable self‑locking without additional inserts
  • High strength compatibility (1100 MPa class to match bolt load capacity)
  • Temperature resistance suitable for many elevated‑temperature aerospace environments

Related Standards

The standard cross‑references and complements the following documents, which are essential for correct specification and procurement:

  • ISO 9156 - dimensions for these anchor nuts
  • EN 2398 / EN 2399 / EN 3638 / EN 3639 - heat‑resisting steels and material forms
  • EN 2491 - MoS2 dry lubricants and coating methods
  • EN 2424 - marking of aerospace products
  • EN 9100 / EN 9133 - quality system and product qualification for aerospace standard parts

For engineers specifying fasteners, EN 3750:2010 provides the practical, normative requirements to ensure compatibility, performance and traceability of 90° corner self‑locking anchor nuts in aerospace applications.

Frequently Asked Questions

SIST EN 3750:2010 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Nuts, anchor, self-locking, fixed, 90° corner, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1100 MPa (at ambient temperature)/315 °C". This standard covers: This standard specifies the characteristics of 90° corner, reduced series, counterbored fixed anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round, in heat resisting steel, MoS2 lubricated. Classification: 1 100 MPa / 315 °C.

This standard specifies the characteristics of 90° corner, reduced series, counterbored fixed anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round, in heat resisting steel, MoS2 lubricated. Classification: 1 100 MPa / 315 °C.

SIST EN 3750:2010 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 3750:2010 has the following relationships with other standards: It is inter standard links to kSIST FprEN 3750:2025. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

SIST EN 3750:2010 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.Aeronavtika - Zakovne matice, samovarovalne, fiksne, rob 90°, skrajšana serija, z izvrtino za vijake, iz toplotnoodpornega jekla, mazane z MoS2 - Klasifikacija: 1100 MPa (pri temperaturi okolice)/315 °CLuft- und Raumfahrt - Annietmuttern, selbstsichernd, einseitiger verkürzter 90° Eckflansch, mit zylindrischer Aussenkung, aus hochwarmfestem Stahl, MoS2-geschmiert - Klasse: 1100 MPa (bei Raumtemperatur)/315 °CSérie aérospatiale - Écrous à river, à freinage interne, fixes, d'angle 90°, série réduite, avec chambrage, en acier résistant à chaud, lubrifiés MoS2 - Classification: 1100 MPa (à température ambiante)/315 °CAerospace series - Nuts, anchor, self-locking, fixed, 90° corner, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1100 MPa (at ambient temperature)/315 °C49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 3750:2010SIST EN 3750:2010en,de01-marec-2010SIST EN 3750:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3750
January 2010 ICS 49.030.30 English Version
Aerospace series - Nuts, anchor, self-locking, fixed, 90° corner, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C
Série aérospatiale - Écrous à river, à freinage interne, fixes, d'angle 90°, série réduite, avec chambrage, en acier résistant à chaud, lubrifiés MoS2 - Classification: 1 100 MPa (à température ambiante) / 315 °C
Luft- und Raumfahrt - Annietmuttern, selbstsichernd, einseitiger verkürzter 90° Eckflansch, mit zylindrischer Aussenkung, aus hochwarmfestem Stahl, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur) / 315 °C This European Standard was approved by CEN on 4 December 2009.
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 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 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3750:2010: ESIST EN 3750:2010
...

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