oSIST prEN 2883:2026

• Abstract:

  This document specifies the characteristics of self-locking hexagonal nuts, with counterbore and captive washer, in heat resisting steel, MoS2 lubricated.; Classification: 1 100 MPa1/315 °C2.

• Status: Not Published
• Public Enquiry End Date: 09-Jul-2026
• ICS: 49.025.10 - Steels
• ICS: 49.030.20 - Bolts, screws, studs
• ICS: 49.030.30 - Nuts
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 21-May-2026
• Due Date: 08-Oct-2026
• Completion Date: 10-Jul-2026
• Ref Project: prEN 2883 - Aerospace series — Nuts, hexagonal, self-locking, with counterbore and captive washer, in heat resisting steel, MoS2 lubricated — Classification : 1 100 MPa (at ambient temperature) / 315 °C

• Revises: SIST EN 2883:2009 - Aerospace series - Nuts, hexagonal, self-locking, with counterbore and captive washer, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C
• Effective Date: 20-Jan-2026

Overview

oSIST prEN 2883:2026 is a draft European standard from the SIST organization, covering the specifications for aerospace series self-locking hexagonal nuts with a counterbore and captive washer, made from heat resisting steel and lubricated with molybdenum disulphide (MoS₂). The standard classifies these nuts at a tensile strength of 1,100 MPa (at ambient temperature) and for use up to 315°C. These technical requirements ensure high-strength, thermal resistance, and secure locking for demanding aerospace applications.

Key Topics

• Product Description: Specifies hexagonal, self-locking nuts with an integrated counterbore and captive washer.
• Material: Uses heat resisting steel as defined by referenced EN and SAE material standards, offering durability in high-temperature environments.
• Surface Treatment: Prescribes MoS₂ lubrication for excellent friction reduction and improved corrosion resistance.
• Dimensions and Tolerances: Defines configuration, dimensions, and tolerances referencing ISO and EN standards, ensuring compatibility and interchangeability in aerospace assemblies.
• Marking Requirements: Mandates marking in line with EN 2424 to assure traceability and standard compliance.
• Quality and Qualification: Requires manufacturing under an approved aerospace quality system (such as EN 9100), and product qualification procedures such as EN 9133 for reliability and safety.
• Classification: Classifies nuts for a minimum tensile strength of 1,100 MPa at ambient and operational capacity up to 315°C.

Applications

• Aerospace Fastening Systems: These self-locking hexagonal nuts are specifically designed for use in the assembly of aircraft and aerospace systems where reliability, vibration resistance, and thermal performance are essential.
• Engine and Airframe Structures: Suitable for installation in locations subjected to high mechanical loads and elevated temperatures, including engine mounts, fuselage frameworks, and landing gear assemblies.
• High-Temperature Environments: Effective in aerospace and similar industries where fasteners must maintain integrity and locking capacity at temperatures up to 315°C.
• Maintenance and Replacement: Standardized dimensions and characteristics streamline replacement and maintenance, supporting operational efficiency and minimizing downtime in aerospace fleets.

Related Standards

• EN 2399 / EN 3638 / EN 3639: Define heat resisting steel properties for forged bolts, sheets, strips, plates, and wires, ensuring material compatibility.
• EN 2491: Covers methods for applying MoS₂ dry lubricant coatings in aerospace products.
• EN 2516: Specifies passivation processes for corrosion and heat-resistant steels, bolstering durability.
• ISO 5855-2: Sets limit dimensions for aerospace MJ thread bolts and nuts, ensuring proper fit and function.
• ISO 8538: Details requirements for self-locking nuts with MJ threads used at various temperature ratings.
• ISO 8788: Establishes tolerances for form and position of metric nuts.
• EN 9100 / EN 9133: Guarantee rigorous quality management systems and qualification procedures integral to the aerospace supply chain.

By adhering to oSIST prEN 2883:2026, manufacturers and engineers can ensure the use of reliable, high-performance self-locking nuts in critical aerospace applications, meeting stringent industry requirements for safety, interchangeability, and performance. This standard plays a pivotal role in maintaining component integrity and operational safety in the aerospace sector.

SLOVENSKI STANDARD
01-julij-2026
Aeronavtika - Matice, šestrobe, samozapiralne, z ugreznjeno in robljeno podložko,
iz toplotnoodpornega jekla, namazane z MoS2 - Klasifikacija: 1100 MPa (pri
temperaturi okolice)/315 °C
Aerospace series - Nuts, hexagonal, self-locking, with counterbore and captive washer,
in heat resisting steel, MoS2 lubricated - Classification : 1 100 MPa (at ambient
temperature) / 315 °C
Luft- und Raumfahrt - Sechskantmutter, selbstsichernd, mit zylindrischer Aussenkung
und Bördelscheibe, aus hochwarmfestem Stahl, MoS2 geschmiert - Klasse: 1 100 MPa
(bei Raumtemperatur)/315 °C
Ta slovenski standard je istoveten z: prEN 2883
ICS:
49.025.10 Jekla Steels
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2026
ICS 49.030.20 Will supersede EN 2883:2009
English Version
Aerospace series - Nuts, hexagonal, self-locking, with
counterbore and captive washer, in heat resisting steel,
MoS2 lubricated - Classification : 1 100 MPa (at ambient
temperature) / 315 °C
Luft- und Raumfahrt ¿ Sechskantmutter,
selbstsichernd, mit zylindrischer Aussenkung und
Bördelscheibe, aus hochwarmfestem Stahl, MoS2-
geschmiert ¿ Klasse : 1 100 MPa (bei Raumtemperatur)
/ 315 °C
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 2883:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 Required characteristics . 5
4.1 Configuration – Dimensions – Mass. 5
4.2 Tolerances of form and position . 5
4.3 Materials . 5
4.4 Surface treatment . 5
5 Designation . 7
6 Marking . 7
7 Technical specification . 7
7.1 General. 7
7.2 Approval of manufacturers . 7
7.3 Qualification of nuts . 7
Bibliography . 8

European foreword
This document (prEN 2883:2026) has been prepared by 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 document is currently submitted to the CEN Enquiry.
This document will supersede EN 2883:2009.
— Clause 3, “Terms and definitions”, added;
— 4.3, “Materials”, standards EN 2399, EN 3638, EN 3639 and SAE AMS5525 added;
— Clause 7, “Technical specification”, editorially revised.
1 Scope
This document specifies the characteristics of self-locking hexagonal nuts, wi
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