ISO 8940:2002
(Main)Aerospace - Nuts, anchor, self-locking, sealing, floating, two-lug, with counterbore, with MJ threads, classifications: 900 MPa (at ambient temperature)/120 degrees C, 900 MPa (at ambient temperature)/175 degrees C and 900 MPa (at ambient temperature)/235 degrees C - Dimensions
Aerospace - Nuts, anchor, self-locking, sealing, floating, two-lug, with counterbore, with MJ threads, classifications: 900 MPa (at ambient temperature)/120 degrees C, 900 MPa (at ambient temperature)/175 degrees C and 900 MPa (at ambient temperature)/235 degrees C - Dimensions
ISO 8940:2002 specifies the dimensions of self-locking, sealing, floating, two-lug anchor nuts, with counterbore, with MJ threads, for classifications: 900 MPa/120 °C, 900 MPa/175 °C and 900 MPa/235 °C. ISO 8940:2002 is only applicable for the compilation of aerospace product standards.
Aéronautique et espace — Écrous à river, à freinage interne, étanches, flottants, double patte, avec chambrage, à filetage MJ, classifications: 900 MPa (à température ambiante)/120 degrés C, 900 MPa (à température ambiante)/175 degrés C et 900 MPa (à température ambiante)/235 degrés C — Dimensions
L'ISO 8940:2002 spécifie les dimensions des écrous à river, à freinage interne, étanches, flottants, double patte, avec chambrage, à filetage MJ, de classifications: 900 MPa/120 °C, 900 MPa/175 °C et 900 MPa/235 °C. L'ISO 8940:2002 est uniquement destinée à l'élaboration de normes de produit applicables aux constructions aérospatiales.
General Information
- Status
- Published
- Publication Date
- 28-Aug-2002
- Technical Committee
- ISO/TC 20/SC 4 - Aerospace fastener systems
- Drafting Committee
- ISO/TC 20/SC 4 - Aerospace fastener systems
- Current Stage
- 9093 - International Standard confirmed
- Start Date
- 19-Oct-2021
- Completion Date
- 13-Dec-2025
Relations
- Effective Date
- 06-Jun-2022
- Effective Date
- 15-Apr-2008
Overview
ISO 8940:2002 is an international standard published by the International Organization for Standardization (ISO) that specifies the dimensions for aerospace anchor nuts. These nuts are characterized by their self-locking, sealing, floating, two-lug design with counterbore and MJ threads. The standard defines classifications based on strength and temperature resistance: 900 MPa at ambient temperature with maximum service temperatures of 120 °C, 175 °C, and 235 °C.
This standard provides precise dimensional requirements crucial for ensuring the reliable performance and interchangeability of anchor nuts used in aerospace applications. It supports consistent manufacturing and quality control for fasteners essential to aircraft and space vehicle assembly.
Key Topics
- Nut Type: Anchor, self-locking, sealing, floating, two-lug, with counterbore.
- Thread Type: MJ threads as per ISO 5855-2 specifications.
- Classification: Strength and temperature ratings of 900 MPa at ambient temperature with max operating temperatures of 120 °C, 175 °C, and 235 °C.
- Dimension Specifications: Detailed dimensions and tolerances given in millimeters, applicable after surface coatings but before lubrication.
- Compliance: Designed to satisfy procurement specifications such as ISO 5858 for aerospace fasteners.
- Tolerances: Conformance with ISO 8788 for tolerances of form and position, ensuring precision in fit and function.
- Material & Performance: Nuts must withstand specified tensile stresses without breaking or cracking, retaining original characteristics after exposure to defined temperature limits.
- Manufacturer’s Discretion: Some form details such as seal retainer and anti-rotational devices may vary, provided dimensional requirements are met.
Applications
ISO 8940:2002 nuts are widely used in critical aerospace fastener systems requiring robust mechanical and thermal performance including:
- Aircraft structural assemblies where vibration resistance and sealing are critical.
- Space vehicle component fastenings requiring floating nuts to accommodate misalignment.
- High-temperature zones in aerospace environments such as engine assemblies or heat-exposed airframe parts, benefiting from the distinct temperature classifications.
- Maintenance and repair operations where standardized replacement parts are essential for safety and compliance.
- Aerospace manufacturing ensuring compatibility between fasteners and mating components through consistent dimensional standards.
Using nuts conforming to ISO 8940 guarantees reliable locking, resistance to loosening under vibration, effective sealing against environmental ingress, and the capacity to perform under high mechanical stress and elevated temperatures typical in aerospace settings.
Related Standards
- ISO 5855-2:1999: Aerospace MJ threads - Defines limit dimensions for bolts and nuts with MJ thread forms, referenced within ISO 8940 for thread specifications.
- ISO 8788:2000: Aerospace nuts – Specifies tolerances of form and position which ISO 8940 employs to control precision.
- ISO 5858:1999: Aerospace nuts with self-locking and maximum operating temperature requirements align with ISO 8940's procurement specification context.
- ISO 13715:2000: Technical drawings standard related to edges of undefined shape, relevant for manufacturing and inspection documentation.
ISO 8940:2002 is essential for aerospace engineers, manufacturers, and quality assurance professionals aiming to standardize and optimize the use of specialized anchor nuts in aircraft and space vehicle construction. Adherence to this standard helps maintain structural integrity, safety, and performance in high-demand aerospace environments.
ISO 8940:2002 - Aerospace -- Nuts, anchor, self-locking, sealing, floating, two-lug, with counterbore, with MJ threads, classifications: 900 MPa (at ambient temperature)/120 degrees C, 900 MPa (at ambient temperature)/175 degrees C and 900 MPa (at ambient temperature)/235 degrees C -- Dimensions
ISO 8940:2002 - Aéronautique et espace -- Écrous a river, a freinage interne, étanches, flottants, double patte, avec chambrage, a filetage MJ, classifications: 900 MPa (a température ambiante)/120 degrés C, 900 MPa (a température ambiante)/175 degrés C et 900 MPa (a température ambiante)/235 degrés C -- Dimensions
Frequently Asked Questions
ISO 8940:2002 is a standard published by the International Organization for Standardization (ISO). Its full title is "Aerospace - Nuts, anchor, self-locking, sealing, floating, two-lug, with counterbore, with MJ threads, classifications: 900 MPa (at ambient temperature)/120 degrees C, 900 MPa (at ambient temperature)/175 degrees C and 900 MPa (at ambient temperature)/235 degrees C - Dimensions". This standard covers: ISO 8940:2002 specifies the dimensions of self-locking, sealing, floating, two-lug anchor nuts, with counterbore, with MJ threads, for classifications: 900 MPa/120 °C, 900 MPa/175 °C and 900 MPa/235 °C. ISO 8940:2002 is only applicable for the compilation of aerospace product standards.
ISO 8940:2002 specifies the dimensions of self-locking, sealing, floating, two-lug anchor nuts, with counterbore, with MJ threads, for classifications: 900 MPa/120 °C, 900 MPa/175 °C and 900 MPa/235 °C. ISO 8940:2002 is only applicable for the compilation of aerospace product standards.
ISO 8940:2002 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.
ISO 8940:2002 has the following relationships with other standards: It is inter standard links to ISO 4628-8:2012, ISO 8940:1988. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase ISO 8940:2002 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 ISO standards.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 8940
Second edition
2002-08-01
Aerospace — Nuts, anchor, self-locking,
sealing, floating, two-lug, with counterbore,
with MJ threads, classifications: 900 MPa
(at ambient temperature)/120 °C, 900 MPa
(at ambient temperature)/175 °C and
900 MPa (at ambient temperature)/235 °C —
Dimensions
Aéronautique et espace — Écrous à river, à freinage interne, étanches,
flottants, double patte, avec chambrage, à filetage MJ, classifications:
900 MPa (à température ambiante)/120 °C, 900 MPa (à température
ambiante)/175 °C et 900 MPa (à température ambiante)/235 °C —
Dimensions
Reference number
©
ISO 2002
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Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
The main task of technical committees is to prepare International Standards. Draft International Standards adopted
by the technical committees are circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 8940 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4,
Aerospace fastener systems.
This second edition cancels and replaces the first edition (ISO 8940:1988), which has been technically revised.
Introduction
The dimensions specified in this International Standard have been determined to allow production of a part which
will satisfy the requirements of the procurement specification ISO 5858.
iv © ISO 2002 – All rights reserved
INTER
...
NORME ISO
INTERNATIONALE 8940
Deuxième édition
2002-08-01
Aéronautique et espace — Écrous à river, à
freinage interne, étanches, flottants, double
patte, avec chambrage, à filetage MJ,
classifications: 900 MPa (à température
ambiante)/120 °C, 900 MPa (à température
ambiante)/175 °C et 900 MPa (à température
ambiante)/235 °C — Dimensions
Aerospace — Nuts, anchor, self-locking, sealing, floating, two-lug, with
counterbore, with MJ threads, classifications: 900 MPa (at ambient
temperature)/120 °C, 900 MPa (at ambient temperature)/175 °C and
900 MPa (at ambient temperature)/235 °C — Dimensions
Numéro de référence
©
ISO 2002
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© ISO 2002
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Web www.iso.ch
Imprimé en Suisse
ii © ISO 2002 – Tous droits réservés
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux de
normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général confiée aux
comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire partie du comité
technique créé à cet effet. Les organisations internationales, gouvernementales et non gouvernementales, en
liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec la Commission
électrotechnique internationale (CEI) en ce qui concerne la normalisation électrotechnique.
Les Normes internationales sont rédigées conformément aux règles données dans les Directives ISO/CEI,
Partie 3.
La tâche principale des comités techniques est d'élaborer les Normes internationales. Les projets de Normes
internationales adoptés par les comités techniques sont soumis aux comités membres pour vote. Leur publication
comme Normes internationales requiert l'approbation de 75 % au moins des comités membres votants.
L'attention est appelée sur le fait que certains des éléments de la présente Norme internationale peuvent faire
l'objet de droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable de
ne pas avoir identifié de tels droits de propriété et averti de leur existence.
L'ISO 8940 a été élaborée par le comité technique ISO/TC 20, Aéronautique et espace, sous-comité SC 4,
Éléments de fixation pour constructions aérospatiales.
Cette deuxième édition annule et remplace la première édition (ISO 8940:1988), dont elle constitue une révision
technique.
Introduction
Les dimensions spécifiées dans la présente Norme internationale ont été définies pour permettre la production
d’une pièce satisfaisant aux exigences de la spécification d’approvisionnement ISO 5858.
iv © ISO 2002 – Tous
...
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