prEN 2883

• 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
• Publication Date: 14-Sep-2027
• ICS: 49.030.20 - Bolts, screws, studs
• ICS: 49.030.30 - Nuts
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3/S 2 - Fasteners
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 16-Jul-2026
• Completion Date: 16-Jul-2026
• Ref Project: oSIST prEN 2883:2026 - 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: 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

prEN 2883 is a CEN draft European Standard for aerospace self-locking hexagonal nuts with a counterbore and captive washer, made in heat resisting steel and lubricated with molybdenum disulphide (MoS2). It specifies the product characteristics, classification, marking, and technical specification for these nuts.

prEN 2883 is used by aerospace manufacturers, suppliers, and buyers who need a common definition for this nut type. The document classifies the nuts as 1 100 MPa at ambient temperature / 315 °C, so readers can match the fastener to the required strength level and service temperature.

What does prEN 2883 specify?

prEN 2883 specifies the characteristics of self-locking hexagonal nuts with counterbore and captive washer in heat resisting steel, MoS2 lubricated. It is organized as scope, normative references, terms and definitions, required characteristics, designation, marking, and technical specification, with Figure 1 and Table 1 giving the product configuration and sizes.

The document focuses on the nut and captive washer assembly used in aerospace applications. In practice, that means it tells you how the part is shaped, what materials and surface treatment are acceptable, how it is identified, and what has to be shown before supply.

What are the key requirements of prEN 2883?

prEN 2883 ties the product to the classification 1 100 MPa at ambient temperature / 315 °C. In practical terms, this is the strength and temperature class the nut is designed to meet, and the maximum temperature depends on the surface treatment.

Geometry, dimensions, and fit

prEN 2883 requires the configuration, dimensions, and mass to follow Figure 1 and Table 1. Dimensions and tolerances are given in millimetres, apply before MoS lubrication, and follow ISO 8538; any form details not stated are left to the manufacturer’s option.

This matters because inspection and procurement have to use the stated geometry and the MJ thread limits from ISO 5855-2. Table 1 also covers the diameter codes, so buyers can specify the right size directly on the order.

Form, position, and materials

prEN 2883 requires tolerances of form and position to follow ISO 8788. The nut material has to be heat resisting steel in accordance with EN 2399, EN 3638, EN 3639, or TR 3791, and for MJ3 and MJ4 sizes the manufacturer may use SAE AMS5525; the washer material has to follow EN 3638 or TR 3791.

This matters in practice because the document allows only defined material families for the fastener parts. For sourcing and quality control, the material certificate has to match one of the accepted standards.

Surface treatment, designation, and marking

prEN 2883 requires the nut to use the EN 2491 MoS2 dry lubricant coating method, with no coating thickness specified, and the washer to follow EN 2516 with the process class appropriate to the material. The document also states that the stated dimensional values apply before surface treatment and do not apply to threads and sheared edges, and it calls for sharp edges to be removed.

For identification, prEN 2883 uses the designation format shown by the example NUT EN2883-050, where 050 is the diameter code. Marking has to follow EN 2424, style N.

Technical specification, approval, and qualification

prEN 2883 says the technical specification follows ISO 5858 with modifications in Clause 7. Manufacturers have to be approved production organizations for aerospace products and show that they operate a quality management system such as EN 9100 or an equivalent aerospace accepted and established system.

The nuts also have to go through an aerospace qualification procedure such as EN 9133 or an equivalent procedure, and the tests have to be documented unless customer and supplier agree otherwise. This is the part the buyer or quality manager uses to verify that the product is not only defined, but also controlled and qualified for aerospace supply.

Who uses prEN 2883?

prEN 2883 is used by aerospace fastener manufacturers, captive-washer nut suppliers, procurement teams, quality managers, and approval or qualification laboratories. It is relevant anywhere a self-locking hexagonal nut has to be specified, manufactured, marked, inspected, and qualified for aerospace use.

What changed in prEN 2883 from the previous edition?

prEN 2883 will supersede EN 2883:2009. Compared with that edition, it adds Clause 3, expands Clause 4.3 with EN 2399, EN 3638, EN 3639, and SAE AMS5525, and revises Clause 7 editorially.

Which standards are used with prEN 2883?

prEN 2883 relies on dated and undated references. For dated references, the cited edition applies; for undated references, the latest edition applies.

Reference	What it contributes
EN 2399	One accepted heat resisting steel material standard for the nut
EN 2424	Marking of aerospace products
EN 2491	MoS2 dry lubricant coating methods
EN 2516	Passivation and decontamination process for the washer
EN 3638	Accepted heat-resisting alloy material standard
EN 3639	Accepted wire material standard for forged fasteners
ISO 5855-2	MJ thread limit dimensions for bolts and nuts
ISO 5858	Procurement specification for self-locking nuts up to 425 °C
ISO 8538	Dimensions for self-locking hexagonal nuts with counterbore and captive washer
ISO 8788	Tolerances of form and position
TR 3791	Material guidance for self-locking nuts and related inserts
SAE AMS5525	Alternative material standard for MJ3 and MJ4 sizes
EN 9100	Example of an acceptable aerospace quality management system
EN 9133	Example of an aerospace qualification procedure

What does the prEN 2883 document contain?

prEN 2883 contains Figure 1 for the nut-and-washer configuration and Table 1 for size, thread, and mass information. It also contains the designation rule, the marking requirement, and the technical specification rules for manufacturer approval and product qualification.

For practical use, the document gives the information needed for design selection, purchasing descriptions, inspection of dimensions and form, marking checks, and qualification planning.

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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